Artykuły w czasopismach: „High strength concrete”

1

Salas-Montoya, Andrés, i Beatriz E. Mira-Rada. "Evaluation of key aggregate parameters on the properties of ordinary and high strength concretes". VITRUVIO - International Journal of Architectural Technology and Sustainability 8 (11.05.2023): 76–85. http://dx.doi.org/10.4995/vitruvio-ijats.2023.19596.

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This paper reports the results of a study conducted to determine the influence of coarse aggregate type on the workability, compressive strength, and flexural strength of normal and high strength concretes with target 28-day compressive strengths of 30 and 60 MPa and two water/cement ratios of 0.44 and 0.27. The concretes were prepared using four types of natural coarse aggregates, namely diabase, calcareous, river gravel, and basalt, with maximum particle sizes of 12.7 and 19.1 millimeters. Silica fume was added to the high-strength concretes at a replacement ratio to Portland cement of 10% by mass. The results showed that among all aggregates, basaltic aggregate with a maximum particle size of 12.7 millimeters produced concrete with the highest compressive and flexural strength, followed by limestone and river aggregate, indicating that particle size, surface texture, structure and mineralogical composition play a dominant role in the behavior of concretes, especially high strength concretes. Normal strength concretes showed similar compressive strengths, while the concrete containing limestone gave slightly higher strength. These results show that for a given water/cementitious material ratio, the influence of the type of coarse aggregate on the compressive strength of the concrete is more important for high strength concrete than for normal strength concrete.

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Salas-Montoya, Andrés, i Beatriz E. Mira-Rada. "Evaluation of key aggregate parameters on the properties of ordinary and high strength concretes". VITRUVIO - International Journal of Architectural Technology and Sustainability 8 (11.05.2023): 76–85. http://dx.doi.org/10.4995/vitruvioijats.2023.19596.

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This paper reports the results of a study conducted to determine the influence of coarse aggregate type on the workability, compressive strength, and flexural strength of normal and high strength concretes with target 28-day compressive strengths of 30 and 60 MPa and two water/cement ratios of 0.44 and 0.27. The concretes were prepared using four types of natural coarse aggregates, namely diabase, calcareous, river gravel, and basalt, with maximum particle sizes of 12.7 and 19.1 millimeters. Silica fume was added to the high-strength concretes at a replacement ratio to Portland cement of 10% by mass. The results showed that among all aggregates, basaltic aggregate with a maximum particle size of 12.7 millimeters produced concrete with the highest compressive and flexural strength, followed by limestone and river aggregate, indicating that particle size, surface texture, structure and mineralogical composition play a dominant role in the behavior of concretes, especially high strength concretes. Normal strength concretes showed similar compressive strengths, while the concrete containing limestone gave slightly higher strength. These results show that for a given water/cementitious material ratio, the influence of the type of coarse aggregate on the compressive strength of the concrete is more important for high strength concrete than for normal strength concrete.

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Bílek, Vlastimil, Vladimíra Tomalová, Petr Hájek i Ctislav Fiala. "Evolution from High Strength Concrete to High Performance Concrete". Key Engineering Materials 629-630 (październik 2014): 49–54. http://dx.doi.org/10.4028/www.scientific.net/kem.629-630.49.

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High strength concrete for the production of concrete railway sleepers was designed more than 20 years ago. The compressive strength of the concrete was very high from the start, but flexure strengths showed some irregular development - a decrease in time. Later, also a significant decrease of fracture properties was recorded. Microcracking was found to be the reason for this; therefore some modifications were performed to avoid this happening (especially the reduction of the maximum size of aggregates from 22 mm to 16 mm or 11 mm). Some problems concerning frost resistance of the concrete with a slag addition were reduced by applying ternary binders. All of the results are discussed from the point of view of a long-term observation of the strengths and fracture properties ́ development during the time period of 5 years or even more.

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Skalny, J., i L. R. Roberts. "High-Strength Concrete". Annual Review of Materials Science 17, nr 1 (sierpień 1987): 35–56. http://dx.doi.org/10.1146/annurev.ms.17.080187.000343.

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El Mir, Abdulkader, Salem Georges Nehme i Kinga Nehme. "In situ application of high and ultra high strength concrete". Epitoanyag - Journal of Silicate Based and Composite Materials 68, nr 1 (2016): 20–23. http://dx.doi.org/10.14382/epitoanyag-jsbcm.2016.4.

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Vincent, Thomas, i Togay Ozbakkloglu. "An Experimental Study on the Compressive Behavior of CFRP-Confined High- and Ultra High-Strength Concrete". Advanced Materials Research 671-674 (marzec 2013): 1860–64. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.1860.

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It is well established that external confinement of concrete with fiber reinforced polymer (FRP) sheets results in significant improvements on the axial compressive behavior of concrete. This understanding has led to a large number of experimental studies being conducted over the last two decades. However, the majority of these studies have focused on normal strength concretes (NSC) with compressive strengths lower than 55 MPa, and studies on higher strength concretes have been very limited. This paper presents the results of an experimental study on the compressive behavior of FRP confined high- and ultra high-strength concrete (HSC and UHSC) with average compressive strengths of 65 and 100 MPa. A total of 29 specimens were tested under axial compression to investigate the influence of key parameters such as concrete strength and method of confinement. All specimens were cylindrical, confined with carbon FRP and were 305 mm in height and 152 mm in diameter. Results obtained from the laboratory testing were graphically presented in the form of axial stress-strain relationships and key experimental outcomes are discussed. The results of this experimental study indicate that above a certain confinement threshold, FRP-confined HSC and UHSC exhibit highly ductile behavior. The results also indicate that FRP-wrapped specimens perform similar to concrete-filled FRP tube (CFFT) specimens at ultimate condition, however notable differences are evident at the transition region when comparing stress-strain curves.

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Ekolu, Stephen O., i Sheena Murugan. "Durability Index Performance of High Strength Concretes Made Based on Different Standard Portland Cements". Advances in Materials Science and Engineering 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/410909.

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A consortium of three durability index test methods consisting of oxygen permeability, sorptivity and chloride conductivity were used to evaluate the potential influence of four (4) common SANS 10197 cements on strength and durability of concrete. Twenty four (24) concrete mixtures of water-cement ratios (w/c's) = 0.4, 0.5, 0.65 were cast using the cement types CEM I 42.5N, CEM II/A-M (V-L) 42.5N, CEM IV/B 32.5R and CEM II/A-V 52.5N. The concretes investigated fall in the range of normal strength, medium strength and high strength concretes. It was found that the marked differences in oxygen permeability and sorptivity results observed at normal and medium strengths tended to vanish at high concrete strengths. Also, the durability effects attributed to use of different cement types appear to diminish at high strengths. Cements of low strength and/or that contained no extenders (CEM 32.5R, CEM I 42.5N) showed greater sensitivity to sorptivity, relative to other cement types. Results also show that while concrete resistance to chlorides generally improves with increase in strength, adequately high chloride resistance may not be achieved based on high strength alone, and appropriate incorporation of extenders may be necessary.

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8

Tolstoy, A. "FINE-GRAINED HIGH-STRENGTH CONCRETE". Construction Materials and Products 3, nr 1 (8.07.2020): 39–43. http://dx.doi.org/10.34031/2618-7183-2020-3-1-39-43.

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the article discusses the possibilities of improving the strength characteristics of fine-grained concrete. Modification of compositions and production technology of fine-grained high-strength concrete is possible with the use of natural and man-made raw materials of various chemical and mineral composition. It is shown that it is possible to increase the economic feasibility of high-strength fine-grained concretes with the preservation of performance characteristics due to the use of man-made raw materials and production waste. The issues of controlling the processes of structure formation and identifying a potentially stable state of hardening compositions are considered, possibly on the basis of modification and design methods for the composition of construction objects with improved properties.

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9

MUGURUMA, Hiroshi. "High strength and ultra-high strength concrete." Journal of the Society of Materials Science, Japan 38, nr 431 (1989): 875–85. http://dx.doi.org/10.2472/jsms.38.875.

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Lahoud, Antoine E. "Slenderness effects in high-strength concrete columns". Canadian Journal of Civil Engineering 18, nr 5 (1.10.1991): 765–71. http://dx.doi.org/10.1139/l91-093.

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High-strength concretes are being increasingly used in the columns of high-rise buildings. Analytical studies of the slenderness effects in these columns have been very limited. The behavior of slender columns with normal- and high-strength concretes is studied using a finite element program. Differences and similarities in long-term and short-term behaviors between high-strength and normal-strength slender concrete columns are noted and discussed. Key words: columns, slenderness, high-strength concrete, creep, finite elements.

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11

Pereira Prado, Lisiane, Ricardo Carrazedo i Mounir Khalil El Debs. "Interface strength of High-Strength concrete to Ultra-High-Performance concrete". Engineering Structures 252 (luty 2022): 113591. http://dx.doi.org/10.1016/j.engstruct.2021.113591.

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Saeed, Jalal Ahmad, i Abbas Mohammed Abubaker. "Shear Strength and Behavior of High Strength Reinforced Concrete Beams without Stirrups". Sulaimani Journal for Engineering Sciences 3, nr 3 (1.04.2016): 64–75. http://dx.doi.org/10.17656/sjes.10037.

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Saeed, S. A., i S. R. Sarhat. "Strength of fiber reinforced high-strength concrete with stirrups under direct shear". Journal of Zankoy Sulaimani - Part A 2, nr 2 (1.09.1999): 64–73. http://dx.doi.org/10.17656/jzs.10040.

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Ekolu, Stephen O., Zaid Mohamed i Sean Kay. "Experimental Investigation and Yield Line Prediction for Ultimate Capacity of Recycled Aggregate Concrete Slabs". International Journal of Engineering Research in Africa 47 (marzec 2020): 31–44. http://dx.doi.org/10.4028/www.scientific.net/jera.47.31.

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The present investigation was conducted to evaluate the influence of recycled aggregates on structural behaviour of reinforced concrete (RC) slabs. Concrete mixtures of 0.6 and 0.4 water/cement ratios were used to produce normal strength concretes and high strength concretes, respectively. Various concrete mixtures were prepared by replacing 19 mm natural coarse aggregates with 0, 25, 50, 100% recycled coarse aggregate (RCA) then used to cast RC slabs of size 500 x 300 x 100 mm thick, and 100 mm cubes. The two-way concrete slabs were reinforced orthotropically with Y12 steel bars. Workability, compressive strength, and split tensile strength properties of concrete were measured, while the RC slabs were subjected to monotonic loading until failure. The experimental results obtained were compared with theoretical failure loads predicted using the yield line theory. It was found that the use of RCA in concrete generally leads to reduction of workability and concrete strength in proportion with the RCA content incorporated into the mixture. The yield line method gave a conservative and accurate theoretical prediction of the actual ultimate loads for control concretes, predicting 10% lower values, but it exhibited loss of prediction accuracy for RCA concretes of normal strengths basically overestimating their failure loads. Accordingly, it would be unsafe to employ the yield line method for design of RCA concrete slabs of normal strengths. Generally, the adverse effects of RCA on concrete properties and structural behaviour can be mitigated significantly by adjusting mixture designs to higher strengths or by employing high strength concretes

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Bazhenov, Yu M., S.-A. Yu Murtazaev, D. K.-S. Bataev, A. H. Alaskhanov, T. S. A. Murtazaeva i M. S. Saydumov. "High-strength concretes based on anthropogenic raw materials for earthquake resistant high-rise construction". Engineering Solid Mechanics 9, nr 3 (2021): 335–46. http://dx.doi.org/10.5267/j.esm.2021.1.004.

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This work is devoted to development of optimum recipes of high-strength concretes based on filled binders with fine-milled anthropogenic mineral filler intended for earthquake resistant high-rise monolithic construction. The optimum recipes of concretes in this work have been developed on the basis of computations and experimental designing of cast concrete mixes with chemical additives and anthropogenic mineral fillers, as well as destructive inspection methods as the most precise for analysis of physicomechanical and deformation properties of concrete. The following raw materials have been used for production of high-strength concretes: natural quartz sands with the fineness modulus F.M. = 1.7-1.8; crushed limestone with the particles sizes of 5-20 mm; water reducing chemical additives and hardening retarder to control specifications of concrete mixes; plain Portland cement, grade PTs 500 D0; anthropogenic mineral additives (fillers) in the form of crushed concrete and ceramic bricks. Optimum recipes of monolithic concretes have been designed using anthropogenic raw materials including normal concrete grades with compressive strength of M30-M40 and high-strength concrete grades of M50-M80, characterized by high homogeneity of cement stone with significantly finer pores and lower shrinkage. Herewith, it has been established that fine-milled anthropogenic mineral filler in the form of crushed concrete and ceramic bricks at the ratio of 70:30, respectively, efficiently influences specifications of concrete mixes on their basis significantly increasing resistance of the mix against sedimentation and water gain. It has been established that the developed high-strength concretes based on filled binders with fine-milled anthropogenic mineral filler are characterized by high freeze–thaw resistance (from F400 to F600) and water tightness (W14 and higher), which is a solid base providing high lifecycle of such concretes.

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Marzouk, H. "Creep of high–strength concrete and normal–strength concrete". Magazine of Concrete Research 43, nr 155 (czerwiec 1991): 121–26. http://dx.doi.org/10.1680/macr.1991.43.155.121.

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Bezgodov, Igor, Simyon Kaprielov i Andrey Sheynfeld. "RELATIONSHIP BETWEEN STRENGTH AND DEFORMATION CHARACTERISTICS OF HIGH-STRENGTH SELF-COMPACTING CON-CRETE". International Journal for Computational Civil and Structural Engineering 18, nr 2 (24.06.2022): 175–83. http://dx.doi.org/10.22337/2587-9618-2022-18-2-175-183.

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he paper provides data on the strength and deformation characteristics of heavy self-compacting concrete of classes B30-B100 with a cubic compressive strength of 36.5-114.8 MPa. It has been established that the values of the concrete prism compressive strength (36.2-104.2 MPa) are 42-64% higher than the normalized values given in the building code of the Russian Federation SP 63.13330.2018. The values of the static modulus of elasticity for high-strength concretes of classes B80-B100 are 44.1-48.1 GPa and exceed by 5-12% the values given in SP 63.13330.2018. The ultimate compressive strains of concrete of classes B30-B100 are in the range from 261×10-5 to 326×10-5 and exceed the value of 200×10-5 given in SP 63.13330.2018. Complete deformation diagrams of self-compacting concretes of classes B30-B100 have been constructed. The nonlinearity of these ones decreases with increasing concrete strength. The descending branch of the σ-ε diagram is observed only for concrete of a class below B55 with a total relative compres-sive strain of 403.3 × 10-5 under a loading level of 0.85Rb. Concrete of classes B55-B100 has no descending branch. Previously established dependencies are refined for the analytical description of strains and stresses at any stages of loading structures.

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D, Zealakshmi, Ravichandran A i Kothandaraman S K. "Strength Modeling of High Strength Concrete". IOSR Journal of Mechanical and Civil Engineering 11, nr 3 (2014): 57–61. http://dx.doi.org/10.9790/1684-11375761.

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Zhou, Bai Rui, Dong Dong Han, Jian Hua Yang, Yi Liang Peng i Guo Xin Li. "Effects of Two Polypropylene Fibers on the Properties of High Strength Concrete". Applied Mechanics and Materials 357-360 (sierpień 2013): 1328–31. http://dx.doi.org/10.4028/www.scientific.net/amm.357-360.1328.

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Portland cement, crushed stone, sand and superplasticizer were used to obtain a high strength concrete with a low water to binder ratio. A reticular polypropylene fiber and a single polypropylene fiber were used to improve the strength of the high strength concrete, but the effects of the two fibers on the slump and strengths were quite different. The reasons of the differences were the surface area and the modulus of elasticity of the fibers. The results show the reticular fiber was better to used in high strength concretes.

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Singh, Ramanpreet, Gurprit Singh Bath i Manjeet Bansal. "Study of High Strength Concrete Using Microsilica". International Journal of Emerging Research in Management and Technology 6, nr 8 (25.06.2018): 414. http://dx.doi.org/10.23956/ijermt.v6i8.174.

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The framework of bridges, buildings, roads etc. need concrete. The concrete which is being used is not able to fulfil the contemporaneous needs. In India High Strength Concrete (HSC) is preferred for manufacturing practices and at the same time High Performance Concrete is used at high level. The properties of HSC are improved like mechanical and durability are improved by using silica fume in concrete. HSC has made the work of construction company more rewarding to design tall, long and light structures. HSC is helpful in designing buildings with good number of floors, wide area bridges and slim structure. The products like fly-ash, copper slag, silica fume etc. are produced by industries which leads to various environmental problems. The experiment on silica was done which stated that no strength is lost in silica-fume concretes. The experiment comprises four levels of silica-fume at the rate of 0%, 5.5%, 8.0%,9.5% and 11.0% which results high strength concrete.

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Kojima, M. "Ultra-high-strength Concrete". Concrete Journal 54, nr 5 (2016): 554–58. http://dx.doi.org/10.3151/coj.54.5_554.

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Chen, Guo Can, Zhi Sheng Xu i Wei Hong Tang. "Residual Strength of Super High Strength Concrete Used Stone-Chip after Exposure to High Temperatures". Advanced Materials Research 374-377 (październik 2011): 2456–60. http://dx.doi.org/10.4028/www.scientific.net/amr.374-377.2456.

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This paper presents the results of experimental studies on the residual compressive strength of concrete produced with stone-chip as fine aggregates with the compressive strengths of unheated specimen ranging from 45.8 to 129.5MPa after exposure to high temperatures and the experimental parameters being the temperature, admixtures, and PP fiber. Specimens were heated in an electric furnace for 4h to high temperatures ranging from 150 to 960°C. Experimental results showed that the compressive strengths of super high strength concrete used stone-chip (abbreviated to SHSCUS) and normal strength concrete used stone-chip (abbreviated to NSCUS) after exposure to elevated temperatures changed in the manners different from that of normal strength concrete, which reached their peak at about 400°C, and the presence of pp ﬁbers in SHSCUS concrete could reduce the risk of spalling at the high temperatures and the peak value after fire.

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Lee, Ming-Gin, Wei-Chien Wang, Yung-Chih Wang, Yi-Cheng Hsieh i Yung-Chih Lin. "Mechanical Properties of High-Strength Pervious Concrete with Steel Fiber or Glass Fiber". Buildings 12, nr 5 (7.05.2022): 620. http://dx.doi.org/10.3390/buildings12050620.

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Pervious concrete (also called porous concrete) is one of the most promising sustainable and green building materials today. This study examined high-strength pervious concrete and ordinary-strength pervious concrete reinforced with steel fiber or glass fiber. A total of fifteen mixtures of normal- and high-strength pervious concretes with steel fiber or glass fiber were used. The goal of high-strength pervious concrete is that the 28-day compressive strength be above 42 MPa and the porosity be as close to 15% as possible to achieve technical specifications. Both normal- and high-strength pervious concretes reinforced with steel fiber (1%, 2%) or glass fiber (0.25%, 0.5%) were investigated in water permeability, porosity, compressive strength, flexural strength, elastic modulus, and toughness tests. The test results show that in both high-strength pervious concrete and ordinary pervious concrete with steel fibers added, the porosity and permeability coefficient are increased compared with the control group. The coefficient of permeability for high-strength, fiber-reinforced pervious concretes with two aggregate sizes meets the requirements of the ACI specification for structural concrete. In addition, the high-strength pervious concrete specimen H1-S2 (2% steel fiber) has the highest compressive strength of 52.8 MPa at the age of 28 days. The flexural strength of pervious concrete also increases with age. However, the flexural strength of fiber-reinforced pervious concrete did not follow this trend due to the large variation in the quality control of different fiber mixtures. However, both steel fiber and glass fiber have a certain degree of improvement in the flexural toughness, and the effect is better with steel fiber. After the flexural strength reaches the peak value, there is still about 30% of the bearing capacity, and it gradually decreases until it is completely destroyed.

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R, Sriram, Mr Prabakaran i Mrs Uma Nambi. "Experimental Study on High Strength Concrete using Industrial Wastes". International Journal of Trend in Scientific Research and Development Volume-3, Issue-3 (30.04.2019): 976–80. http://dx.doi.org/10.31142/ijtsrd23155.

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K.L., Ravisankar. "Experimental Investigation on High Strength Concrete Using Polypropylene Fiber". Journal of Advanced Research in Dynamical and Control Systems 11, nr 12 (31.12.2019): 193–200. http://dx.doi.org/10.5373/jardcs/v11i12/20193372.

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Saeed, Srakawt Abdul-Rahman. "Experimental Study of High Strength Fibrous Reinforced Concrete Slabs". Journal of Zankoy Sulaimani - Part A 9, nr 1 (17.06.2004): 7–16. http://dx.doi.org/10.17656/jzs.10144.

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Solikin, Mochamad. "Compressive Strength Development of High Strength High Volume Fly Ash Concrete by Using Local Material". Materials Science Forum 872 (wrzesień 2016): 271–75. http://dx.doi.org/10.4028/www.scientific.net/msf.872.271.

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This paper presents a research to produce high strength concrete incorporated with fly ash as cement replacement up to 50% (high volume fly ash concrete) by using local material. The research is conducted by testing the strength development of high volume fly ash concrete at the age of 14 days, 28 days and 56 days. As a control mix, the compressive strength of Ordinary Portland Cement (OPC) concrete without fly ash is used. Both concrete mixtures use low w/c. consequently, they lead to the use of 1 % superplasticizer to reach sufficient workability in the process of casting. The specimens are concrete cubes with the dimension of 15 cm x15 cm x 15 cm. The totals of 24 cubes of HVFA concrete and OPC concrete are used as specimens of testing. The compressive strength design of concrete is 45 MPa and the slump design is ± 10 cm. The result shows that the compressive strengths of OPC concrete at the age of 14 days, 28 days, and 56 days are 38 MPa, 40 MPa, and 42 MPa. Whereas the compressive strength of HVFA concrete in the same age of immersing sequence are 29 MPa, 39 MPa, and 42 MPa. The result indicates that HVFA concrete can reach the similar compressive strength as that of normal concrete especially at the age of 56 days by deploying low water cement ratio.

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Basaldella, Marco, Marvin Jentsch, Nadja Oneschkow, Martin Markert i Ludger Lohaus. "Compressive Fatigue Investigation on High-Strength and Ultra-High-Strength Concrete within the SPP 2020". Materials 15, nr 11 (26.05.2022): 3793. http://dx.doi.org/10.3390/ma15113793.

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The influence of the compressive strength of concrete on fatigue resistance has not been investigated thoroughly and contradictory results can be found in the literature. To date, the focus of concrete fatigue research has been on the determination of the numbers of cycles to failure. Concerning the fatigue behaviour of high-strength concrete (HPC) and, especially, ultra-high-strength concrete (UHPC), which is described by damage indicators such as strain and stiffness development, little knowledge is available, as well as with respect to the underlying damage mechanisms. This lack of knowledge has led to uncertainties concerning the treatment of high-strength and ultra-high-strength concretes in the fatigue design rules. This paper aims to decrease the lack of knowledge concerning the fatigue behaviour of concrete compositions characterised by a very high strength. Within the priority programme SPP 2020, one HPC and one UHPC subjected to monotonically increasing and cyclic loading were investigated comparatively in terms of their numbers of cycles to failure, as well as the damage indicators strain and stiffness. The results show that the UHPC reaches a higher stiffness and a higher ultimate strain and strength than the HPC. The fatigue investigations reveal that the UHPC can resist a higher number of cycles to failure than the HPC and the damage indicators show an improved fatigue behaviour of the UHPC compared to the HPC.

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Srinivasa Reddy, V., i R. Nirmala. "Development of quaternary blended high performance concrete made with high reactivity metakaolin". International Journal of Engineering & Technology 7, nr 2.1 (5.03.2018): 79. http://dx.doi.org/10.14419/ijet.v7i2.1.11048.

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In the last three decades, supplementary cementitious materials such as fly ash, silica fume and ground granulated blast furnace slag have been judiciously utilized as cement replacement materials as these can significantly enhance the strength and durability characteristics of concrete in comparison with ordinary Portland cement (OPC) alone. Hence, high-performance concretes can be produced at lower water/powder ratios by incorporating these supplementary materials. One of the main objectives of the present research work was to investigate synergistic action of binary, ternary and quaternary blended high strength grade (M80) concretes on its compressive strength. For blended high strength grade (M80) concrete mixes the optimum combinations are: Binary blend (95%OPC +5% FA, 95%OPC +5% MS and 95%OPC +5%MK), ternary blend (65%OPC+20%FA+15%MS) and quaternary blend (50%OPC+28%FA+11%MS+11%MK). Use of metakaolin in fly ash based blended concretes enhances compressive strength significantly and found to be cost effective in terms of less cement usage, increased usage of fly ash and also plays a major role in early strength development of fly ash based blended concrete.

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Davidyuk, Artem, i Igor Rumyantsev. "Quality control of high-performance concrete in high-rise construction during operation". MATEC Web of Conferences 170 (2018): 01035. http://dx.doi.org/10.1051/matecconf/201817001035.

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With onset of the XXI century, the demand for construction of high-rise buildings with the load-bearing framework made of high-performance cast-in-situ concrete has increased many-fold in the construction sector. Specific features of the high-performance concrete of bearing structures in the situation of real operation of high-rise buildings are continuously studied by scientists and specialists all over the world, and regulatory and methodological documents are being complemented and adjusted. High-performance concretes and structures made of them possess some specific features that should be taken into account in quality control. The methods of concrete inspection and concrete strength evaluation described in GOST 18105 “Concretes. Guidelines on Testing and Evaluation of Strength” and GOST 22690 “Concretes. Evaluation of Strength by Mechanic Non-Destructive Test Methods” were written when precast reinforced concrete was predominantly used in the construction sector and were limited to the functions of intra-factory quality control of reinforced concrete products. At present, instruments for non-destructive testing using indirect methods are usually calibrated with the help of local destructions, as a rule, a pull out or rib shear test. The said methods are in fact indirect since they indicate the force of destruction of the surface layer of a structure.

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Sunil B, Suthar, i Dr (Smt ). B. K. Shah Dr. (Smt.) B. K. Shah. "Study on Strength Development of High Strength Concrete Containing Alccofine and Fly-Ash". Paripex - Indian Journal Of Research 2, nr 3 (15.01.2012): 102–4. http://dx.doi.org/10.15373/22501991/mar2013/38.

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Kadri, E. H., S. Aggoun, S. Kenai i A. Kaci. "The Compressive Strength of High-Performance Concrete and Ultrahigh-Performance". Advances in Materials Science and Engineering 2012 (2012): 1–7. http://dx.doi.org/10.1155/2012/361857.

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The compressive strength of silica fume concretes was investigated at low water-cementitious materials ratios with a naphthalene sulphonate superplasticizer. The results show that partial cement replacement up to 20% produce, higher compressive strengths than control concretes, nevertheless the strength gain is less than 15%. In this paper we propose a model to evaluate the compressive strength of silica fume concrete at any time. The model is related to the water-cementitious materials and silica-cement ratios. Taking into account the author's and other researchers’ experimental data, the accuracy of the proposed model is better than 5%.

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Sanytsky, Myroslav, Тetiana, Kropyvnytska, Orest Shyiko, Yurii Bobetskyi i Andriy Volianiuk. "High strength steel fiber reinforced concrete for fortification protected structures". Theory and Building Practice 2023, nr 1 (20.06.2023): 37–42. http://dx.doi.org/10.23939/jtbp2023.01.037.

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The article presents the results of research on modified steel fiber-reinforced concrete and shows the expediency of their use to increase the effectiveness of fortification protection structures against shock loads. It was established that according to the results of tests of compressive strength (fсm = 79.4 MPa) and tensile strength during bending (fс, lf = 7.4 MPa), steel fiber-reinforced concrete can be classified as high-strength (strength class C 50/60) and rapid-hardening (fcm2/ fcm28 = 0.57) in accordance with DSTU EN 206:2018. Manufacturing in factory conditions of reinforced concrete elements of structures based on high-strength steel fiber-reinforced concrete with increased resistance to various types of force effects during shelling will allow to obtain quick-assembling/quick-dismantling fortification structures that will be able to provide protection for the personnel of the units of the armed forces of Ukraine.

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Bickley, J. A., J. Ryell, C. Rogers i R. D. Hooton. "Some characteristics of high-strength structural concrete". Canadian Journal of Civil Engineering 18, nr 5 (1.10.1991): 885–89. http://dx.doi.org/10.1139/l91-107.

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The 68-storey Scotia Plaza tower in Toronto is an outstanding example of the use of concrete technology to achieve high-performance high-strength concrete. Cementitious hydraulic slag, silica fume, and a superplasticizer were combined with CSA type-10 Portland cement and high-quality aggregates to produce very workable high-strength concrete. During the course of construction, data were published suggesting the possibility of the strength regression of some silica fume concretes after long exposure to low humidity, the determinations being made on standard test cylinders. Tests were, therefore, made at ages of 1 year and 2 years on specimens drilled from columns in the structure. This technical note gives details of the laboratory examination and testing of these specimens. Key words: high strength, slag, silica fume, permeability, rapid chloride permeability, petrographic examination, superplasticizers.

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Ghafoori, Nader, Matthew O. Maler, Meysam Najimi i Ariful Hasnat. "Abrasion resistance of high early-strength concrete for rapid repair". MATEC Web of Conferences 289 (2019): 02002. http://dx.doi.org/10.1051/matecconf/201928902002.

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This paper examines the abrasion resistance of high early-strength concrete developed for rapid repair of highways and bridge decks. The cement types chosen for this study included ASTM Type III, ASTM Type V, and Calcium Sulfoaluminate (CSA) cements. A cement content of 386 kg/m3 (650 lb/yd3) was maintained for all studied concretes. Test samples were tested after 24 hours and 28 days of curing in order to evaluate compressive strength and depth of wear. Test results revealed that the opening time to attain minimum required compressive strength for CSA cement concrete was one hour, whereas the values for Type V and Type III cement concretes were 8.5 and 6 hours, respectively. After 24 hours curing, CSA cement concrete displayed the highest strength, but lowest resistance to wear. The 28-day cured CSA cement concrete produced the highest strength and resistance to abrasion, while Type III cement concrete showed a similar strength, but lower resistance to wear, when compared to those of the Type V cement concrete.

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Kaprielov, S. S., A. V. Sheynfeld, Al-Omais Dzhalal, A. S. Zaitsev i R. A. Amirov. "A technology of erecting high-rise building frame structures using B60-B100 classes high-strength concretes". Bulletin of Science and Research Center of Construction 33, nr 2 (10.07.2022): 106–21. http://dx.doi.org/10.37538/2224-9494-2022-2(33)-106-121.

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Introduction. The article presents a technology of erecting of high-rise building's frame structures made of B60-B100 classes high-strength concretes. This technology includes a complex of processes and considers a number of special features, the most significant of which are connected with the specific character of high-strength concretes and concreting climatic conditions.Aim. To determine the main requirements for the technology of concreting and parameters of curing the monolithic structures of high-rise buildings made of B60-B100 classes high-strength concretes, including at winter periods, at the various stages of their erection.Methods and materials. Studies were carried out on the effect of hardening temperature variations from +5 to +50 °С on the hardening kinetics of B60, B80, and B100 classes concretes. Based on the 15-year experience of the “Moscow-City” construction, the mix proportions of high-strength concretes were optimized, as well as the main technological parameters of concreting and curing the frame structures located at an altitude of up to 370 m were analyzed and summarized.Results. The mix proportions of B60-B100 classes concretes of high-workability and self-compacting mixtures with a cement consumption of 350–480 kg/m3 was optimized using standard materials and MB-type organomineral modifiers. The performed study revealed a regularity between the strength and the temperature-temporal parameter of concrete curing, which is applicable for a preliminary assessment of strength characteristics in high-strength concrete structures on the basis of their temperature measurement results. A systematic approach to concrete curing and the maintenance of building structures as a whole with the vertical division of a high-rise building into four temperature zones led to a reducing the probability of thermal cracks appearance.Conclusions. According to the results of the study, the proposed complex of technological solutions concerning compositions and properties of concrete mixtures and concretes, the technology of concreting, as well as the methods of heating and curing the concrete of structures at the various stages of their erection ensures thermal resistance to cracks at the early stage of concrete hardening, as well as the high quality and assigned rates of construction.

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Parniani, Sasan, Mohd Warid Hussin i Farnoud Rahimi Mansour. "Compressive Strength of High Volume Slag Cement Concrete in High Temperature Curing". Advanced Materials Research 287-290 (lipiec 2011): 793–96. http://dx.doi.org/10.4028/www.scientific.net/amr.287-290.793.

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Recent consideration has been given to use of GGBFS as separate cementitious material mixed along with Portland cement in production of concrete. Problems are frequently encountered in producing good-quality concrete specially slag cement concrete in hot climates.Curing problems are exaggerated when concreting in hot weather, as a result of both higher concrete temperatures and increased rate of evaporation from the fresh mix. The disadvantage of GGBFS concretes is that they proved to be more sensitive to poor curing than OPC Therefore, special care must be taken when using this type of concrete, especially on site, where the working conditions and the application of curing are not as easy to control as in the laboratory concrete. The purpose of this paper is investigation and evaluation strength loss in slag cement concrete in poor curing situation. To carry out this aim, 72 cube specimens with three different proportion of slag are made and cured in two different conditions. And result of compressive tests compared together to determine susceptibility of GGBFS concrete in hot-dry condition.

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Bashandy, Alaa Ali, Noha M. Soliman i Mahmoud Hamdy Abd Elrahman. "Recycled Aggregate Self-curing High-strength Concrete". Civil Engineering Journal 3, nr 6 (3.07.2017): 427–41. http://dx.doi.org/10.28991/cej-2017-00000102.

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The use of recycled aggregates from demolished constructions as coarse aggregates for concrete becomes a need to reduce the negative effects on the environment. Internal curing is a technique that can be used to provide additional moisture in concrete for more effective hydration of cement to reduce the water evaporation from concrete, increase the water retention capacity of concrete compared to the conventionally cured concrete. High strength concrete as a special concrete type has a high strength with extra properties compared to conventional concrete. In this research, the combination of previous three concrete types to obtain self-curing high-strength concrete cast using coarse recycled aggregates is studied. The effect of varying water reducer admixture and curing agent dosages on both the fresh and hardened concrete properties is studied. The fresh properties are discussed in terms of slump values. The hardened concrete properties are discussed in terms of compressive, splitting tensile, flexure and bond strengths. The obtained results show that, the using of water reducer admixture enhances the main fresh and hardened properties of self-curing high-strength concrete cast using recycled aggregate. Also, using the suggested chemical curing agent increased the strength compared to conventional concrete without curing.

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Křížová, Klára, Martin Ťažký, Milan Meruňka i Ondřej Pikna. "Study of High Strength Concretes with Variability of Composition Designs". Solid State Phenomena 325 (11.10.2021): 156–61. http://dx.doi.org/10.4028/www.scientific.net/ssp.325.156.

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High Strength Concretes (HSC) are concretes defined mainly by compressive strength. The strength of concrete can guarantee other excellent results of properties, namely durability. Essential for the production of HSC is a careful approach to the design of concrete composition, especially the quality of raw materials. It is primarily necessary to increase the content of the binder combined mainly with Portland cement and another admixture. Due to its excellent properties, Silica fume is largely used as an admixture, where it is necessary to consider its effective amount. It is also suitable to combine this admixture with other types of active admixtures. The question of the type of coarse aggregate fractions used is crucial. The quality and purity of aggregates is an essential part of the quality design of these concretes, influencing practically all the resulting parameters of concrete. The article presents a set of tests on designed High strength Concretes, differing in the composition of the concrete to demonstrate the variability of the design concept and its effect on the resulting values of strength and durability.

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Kwan, Albert K. H., Wilson W. S. Fung i Henry H. C. Wong. "Shrinkage of High-strength Concrete and High-flowability Concrete". HKIE Transactions 17, nr 3 (styczeń 2010): 25–33. http://dx.doi.org/10.1080/1023697x.2010.10668201.

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Aulia, Teuku Budi, Muttaqin Muttaqin, Mochammad Afifuddin i Zahra Amalia. "Analysis of Post-Combustion High-Strength Concrete Compressive Strength Using Polypropylene Fibers". MEDIA KOMUNIKASI TEKNIK SIPIL 26, nr 1 (30.07.2020): 118–27. http://dx.doi.org/10.14710/mkts.v26i1.28262.

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High-strength concrete is vulnerable to high temperatures due to its high density. The use of polypropylene fibers could prevent structure explosion by forming canals due to melted fibers during fire, thus release its thermal stress. This study aims to determine the effect of polypropylene fibers on compressive strength of high-strength concrete after combustion at 400ºC for five hours. High-strength concrete was made by w/c-ratio 0.3 with cement amount 550 kg/m3 and added with silica fume 8% and superplasticizer 4% by cement weight. The variations of polypropylene fibers were 0%, 0.2% and 0.4% of concrete volume. The compression test was carried out on standard cylinders Ø15/30 cm of combustion and without combustion specimens at 7 and 28 days. The results showed that compressive strength of high-strength concretes without using polypropylene fibers decreased in post-combustion compared with specimens without combustion, i.e., 0.81% at 7 days and 23.42% at 28 days. Conversely, the use of polypropylene fibers can increase post-combustion compressive strength with a maximum value resulted in adding 0.2% which are 25.52% and 10.44% at 7 and 28 days respectively. It can be concluded that the use of polypropylene fibers is effective to prevent reduction of high-strength concrete compressive strength that are burned at high temperatures.

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Kim, Dae Geon. "Development of High-Strength Concrete Mixed Design System Using Artificial Intelligence". Webology 19, nr 1 (20.01.2022): 4268–85. http://dx.doi.org/10.14704/web/v19i1/web19281.

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The quality inspection of high-strength concrete construction sites consists of a compressive strength test that is considered the most important, but this can be confirmed through a compressive strength test after 28 days of high-strength concrete application. Therefore, it is of paramount importance to ship high-quality products to ready-mixed concrete factories by increasing the reliability of the mixed design that affects high-strength concrete production. In addition, there is a need to develop an efficient management system for mixed design that determines high-strength concrete quality by measuring the mixing ratio of materials in the ready-mixed concrete factory production stage. This study used matrix laboratory(MATLAB) using Deep learning, a language that performs mathematics and engineering calculations based on matrices, and presented a mixed design model by adjusting the strength through input and output variables, learning data collection, model structure determination, learning error, and repetition results. The predicted mean value of 40 MPa was measured at 40.75 MPa, showing a difference of 0.75 MPa and 40 MPa, and the error rate was confirmed to be 4.13%. And the predicted mean value of 55 MPa was measured as 55.55 MPa, showing a difference between 55 MPa and 0.55 MPa, and the error rate was confirmed to be 1.73%. Through this study, the reliability of high-strength concrete quality management is secured by applying a high-strength concrete mixed design system using artificial intelligence(AI) and adjusting it in connection with all fields of the production process.

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Chan, Sammy Y. N., Gai-fei Peng i John K. W. Chan. "Comparison between high strength concrete and normal strength concrete subjected to high temperature". Materials and Structures 29, nr 10 (grudzień 1996): 616–19. http://dx.doi.org/10.1007/bf02485969.

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Luosun, Yi Ming, Jun Zhang i Yuan Gao. "Evaluation of Shrinkage Resulted Cracking of High Strength Calcium Sulfoaluminate Cement Concrete with Impact of Internal Curing". Key Engineering Materials 629-630 (październik 2014): 144–49. http://dx.doi.org/10.4028/www.scientific.net/kem.629-630.144.

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In this paper, restrained ring test and shrinkage test are carried on three kinds of concrete—high-strength portland cement concrete, high-strength calcium sulfoaluminate cement concrete and high-strength calcium sulfoaluminate cement concrete with internal curing in order to evaluate the shrinkage induced cracking performance of the concretes. The experimental results show that calcium sulfoaluminate cement concrete exhibits lower shrinkage caused by surface drying comparing to portland cement concrete. Internal curing can eliminate most of the autogenous shrinkage of concrete. In the ring test, the latter two concrete did not crack during the whole test history—42 days, while high-strength portland cement concrete cracked at the 13th day after casting. High strength calcium sulfoaluminate cement concrete exhibits better anti-cracking ability than the high strength portland cement concrete with the same strength grade.

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Dong, Chun Min, Ke Dong Guo i Jia Jia Sun. "A New Calculation Method for Cracking Width of Beam with High Strength Rebar". Advanced Materials Research 243-249 (maj 2011): 415–18. http://dx.doi.org/10.4028/www.scientific.net/amr.243-249.415.

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With the application of high strength concrete and rebar, the influence of concrete strength on cracking width of reinforced concrete beam with high strength rebar is becoming more and more important. To investigate the effect of concrete strength on cracking width of reinforced concrete beam with high strength rebar, the experiment including 6 simply supported T-beams with high-strength rebar and 2 beams with ordinary-strength rebar have been made. Then the relevant specifications advised in Code for Design of Concreter Structure (GB50010-2002) are revised according to the experiment results so as to considering the influence of concrete on cracking width. A new cracking width method considering the influence of concrete strength on cracking width for reinforced concrete beam with high strength rebar is proposed. Finally, the comparisons between predictions and experiment results have been conducted, which shown that the proposed new cracking width method agreed with experiment results well.

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Ghafoori, Nader, Matthew O. Maler, Meysam Najimi i Ariful Hasnat. "De-icing salt resistance of high early-strength concrete for rapid repairs". MATEC Web of Conferences 361 (2022): 03001. http://dx.doi.org/10.1051/matecconf/202236103001.

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This paper examines the freezing and thawing resistance of high early-strength concrete (HESC) developed for rapid repair of pavements and bridge decks. The cement types chosen for this study included ASTM Type III, ASTM Type V, and Calcium Sulfoaluminate (CSA). A cement content of 386 kg/m3 was maintained for all studied concretes. Specimens were tested after 24 hours and 28 days of curing in order to evaluate compressive and flexural strengths. In addition, the opening time was determined based on the required time to achieve the minimum compressive strength of 20.7 MPa. The freezing and thawing (F–T) resistance of the test samples were evaluated in accordance with the F–T duration of 96 hours per cycle for a total of 25 cycles. Test results revealed that at the opening time and after 24 hours curing, CSA cement concrete displayed the highest compressive and flexural strengths, but lowest resistance to freezing and thawing with de-icing salt. The 28-day cured Type V cement concrete produced the highest strength and de-icing salt resistance, while CSA cement concrete produced the contrary.

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Potha Raju, M., K. Srinivasa Rao i P. S. N. Raju. "Compressive strength of heated high-strength concrete". Magazine of Concrete Research 59, nr 2 (marzec 2007): 79–85. http://dx.doi.org/10.1680/macr.2007.59.2.79.

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Barbosa, M. B., A. M. PEREIRA, J. L. Akasaki, C. F. Fioriti, J. V. Fazzan, M. M. TASHIMA, J. J. P. Bernabeu i J. L. P. Melges. "Impact strength and abrasion resistance of high strength concrete with rice husk ash and rubber tires". Revista IBRACON de Estruturas e Materiais 6, nr 5 (październik 2013): 811–20. http://dx.doi.org/10.1590/s1983-41952013000500007.

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The paper discusses the application of High Strength Concrete (HSC) technology for concrete production with the incorporation of Rice Husk Ash (RHA) residues by replacing a bulk of the material caking and rubber tires with partial aggregate volume, assessing their influence on the mechanical properties and durability. For concrete with RHA and rubber, it was possible to reduce the brittleness by increasing the energy absorbing capacity. With respect to abrasion, the RHA and rubber concretes showed lower mass loss than the concrete without residues, indicating that this material is attractive to be used in paving. It is thus hoped that these residues may represent a technological and ecological alternative for the production of concrete in construction works.

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Khan, Mohammad Iqbal. "Carbonation of High Strength Concrete". Applied Mechanics and Materials 117-119 (październik 2011): 186–91. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.186.

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High strength concrete consisting of binary and ternary blended cementitious systems based on ordinary Portland cement, pulverised fuel ash and silica fume were investigated for carbonation. PFA up to 40% was used and to these blends 0, 5, 10, and 15% SF was incorporated as partial cement replacement. Results of carbonation of concrete cured in mist and air are reported. It was found that carbonation linearly increases with an increase in PFA content. Concrete with OPC only and concrete with 10% SF content showed insignificant change in carbonation when comparing air cured and mist cured concrete. The maximum carbonation depth observed for air cured concrete (containing 40% PFA) was less than 4 mm while in the case of mist cured concrete it was less than 2 mm. This depth is still far less than the cover of reinforced steel bars to cause corrosion.

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Wedatalla, Afaf M. O., Yanmin Jia i Abubaker A. M. Ahmed. "Curing Effects on High-Strength Concrete Properties". Advances in Civil Engineering 2019 (6.03.2019): 1–14. http://dx.doi.org/10.1155/2019/1683292.

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This study was conducted to investigate the impact of hot and dry environments under different curing conditions on the properties of high-strength concrete. The concrete samples were prepared at a room temperature of 20°C and cured under different curing conditions. Some specimens underwent standard curing from 24 h after casting until the day of testing. Some specimens underwent steam curing in a dry oven at 30°C and 50°C after casting until the day of testing. Other specimens were cured for 3, 7, 21, and 28 days in water and then placed in a dry oven at 30°C and 50°C and tested at the age of 28 days, except for the specimens that were cured for 28 days, which were tested at the age of 31 days, to study the effect of curing period on the strength of concrete exposed to dry and hot environments after moist curing. The effects of hot and dry environments on high-strength concrete with different water/binder ratios (0.30, 0.35, and 0.40), using (30%) fly ash for all mixes, and (0%, 5%, and 10%) silica fume with the binder (450, 480, and 520 kg), respectively, were separately investigated, and the effects of curing under different conditions were evaluated by measuring the compressive strength, flexural strength, microhardness, and chloride diffusion and by assessing the concretes’ microstructure. The relationships between these properties were presented. A good agreement was noted between the concrete compressive strength and concrete properties at different temperatures, curing periods, and curing methods.

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