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Zeitschriftenartikel zum Thema "High strength concrete Testing":
1
Price, W. F., und J. P. Hynes. „In-situ strength testing of high strength concrete“. Magazine of Concrete Research 48, Nr. 176 (September 1996): 189–97. http://dx.doi.org/10.1680/macr.1996.48.176.189.
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Johnson, Claude D., und S. Ali Mirza. „Confined capping system for compressive strength testing of high performance concrete cylinders“. Canadian Journal of Civil Engineering 22, Nr. 3 (01.06.1995): 617–20. http://dx.doi.org/10.1139/l95-070.
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This paper presents a simple, inexpensive confined cap testing method which can be employed in the compressive strength testing of high performance concrete cylinders. An inexpensive customized cylinder capping apparatus and standard concrete laboratory testing equipment are employed. The paper describes the capping apparatus, capping and testing procedures, as well as test results for concrete compressive strengths up to and exceeding 100 MPa. Key words: capping, capping confinement, compressive strength, cylinders, end condition, grinding, high-strength concrete, specimen size, testing.
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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 (September 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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Hooton, RD, M. Sonebi und KH Khayat. „Testing Abrasion Resistance of High-Strength Concrete“. Cement, Concrete and Aggregates 23, Nr. 1 (2001): 34. http://dx.doi.org/10.1520/cca10523j.
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Davidyuk, Artem, und 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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Sovová, Kateřina, Karel Mikulica, Adam Hubáček und Karel Dvořák. „Behavior of High Strength Concrete at High Temperatures“. Solid State Phenomena 276 (Juni 2018): 259–64. http://dx.doi.org/10.4028/www.scientific.net/ssp.276.259.
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Concrete is considered as a non-combustible building material. However, at High-Performance Concrete (HPC) is due to its dense structure more likely to occur in explosive spalling. This results in lost of load bearing capacity function of concrete. This paper deals with design, production and testing of the cement-based concrete with the use of different fibers (polypropylene fibers and cellulose fibers). It also assesses the influence of high temperature on strength, visual changes of specimens, changes of surface and degradation of testing specimens due to heat loads according to normative heat curve and also according to hydrocarbon curve.
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Chen, Bo, Yue Bo Cai, Jian Tong Ding und Yao Jian. „Crack Resistance Evaluating of HSC Based on Thermal Stress Testing“. Advanced Materials Research 168-170 (Dezember 2010): 716–20. http://dx.doi.org/10.4028/www.scientific.net/amr.168-170.716.
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In order to evaluate the crack resistance of high strength fly ash concrete, concretes with different contents of silica fume and fly ash were compared with same strength grade by adjusting water to binder ratio. Compared with the concrete with 5% silica fume plus 35% fly ash，concrete with 40% fly ash has same mechanical properties and tensile strain as well as lower drying shrinkage. Complex crack resistance of high strength fly ash concretes were evaluated by Temperature Stress Testing Machine (TSTM). The results show that fly ash concretes have outstanding crack resistance because of higher allowable temperature differential and lower cracking temperature.
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Vincent, Thomas, und Togay Ozbakkloglu. „An Experimental Study on the Compressive Behavior of CFRP-Confined High- and Ultra High-Strength Concrete“. Advanced Materials Research 671-674 (März 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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Wedatalla, Afaf M. O., Yanmin Jia und Abubaker A. M. Ahmed. „Curing Effects on High-Strength Concrete Properties“. Advances in Civil Engineering 2019 (06.03.2019): 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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Bickley, J. A., J. Ryell, C. Rogers und R. D. Hooton. „Some characteristics of high-strength structural concrete“. Canadian Journal of Civil Engineering 18, Nr. 5 (01.10.1991): 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.
Dissertationen zum Thema "High strength concrete Testing":
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Mitchell, Andrew Douglass. „Shear friction behavior of high-strength concrete“. Thesis, Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/19274.
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Zaina, Mazen Said Civil & Environmental Engineering Faculty of Engineering UNSW. „Strength and ductility of fibre reinforced high strength concrete columns“. Awarded by:University of New South Wales. School of Civil and Environmental Engineering, 2005. http://handle.unsw.edu.au/1959.4/22054.
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The main structural objectives in column design are strength and ductility. For higher strength concretes these design objectives are offset by generally poor concrete ductility and early spalling of the concrete cover. When fibres are added to the concrete the post peak characteristics are enhanced, both in tension and in compression. Most of the available experimental data, on fibre reinforced concrete and fibre reinforced high strength concrete columns, suggest that an improvement in both ductility and load carrying capacity due to the inclusion of the fibres. In this thesis the ductility and strength of fibre reinforced high strength concrete are investigated to evaluate the effect of the different parameters on the performance of columns. The investigation includes both experimental and the numerical approaches with 56 high strength fibre reinforced concrete columns being tested. The concrete strength ranged between 80 and 100 MPa and the columns were reinforced with 1, 2 or 2.6 percent, by weight, of end hooked steel fibres. The effect of corrugated Polypropylene fibres on the column performance was also examined. No early spalling of the cover was observed in any of the steel fibre reinforced column tested in this study. A numerical model was developed for analysis of fibre and non-fibre reinforced eccentrically loaded columns. The column is modelled as finite layers of reinforced concrete. Two types of layers are used, one to represent the hinged zone and the second the unloading portion of the column. As the concrete in the hinged layers goes beyond the peak for the stress verus strain in the concrete the section will continue to deform leading to a localised region within a column. The numerical model is compared with the test data and generally shows good correlation. Using the developed model, the parameters that affect ductility in fibre-reinforced high strength concrete columns are investigated and evaluated. A design model relating column ductility with confining pressure is proposed that includes the effects of the longitudinal reinforcement ratio, the loading eccentricity and the fibre properties and content and design recommendations are given.
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Yosefani, Anas. „Flexural Strength, Ductility, and Serviceability of Beams that Contain High-Strength Steel Reinforcement and High-Grade Concrete“. PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4402.
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Utilizing the higher capacity steel in design can provide additional advantages to the concrete construction industry including a reduction of congestion, improved concrete placement, reduction in the required reinforcement and cross sections which would lead to savings in materials, shipping, and placement costs. Using high-strength reinforcement is expected to impact the design provisions of ACI 318 code and other related codes.
The Applied Technology Council (ATC-115) report "Roadmap for the Use of High-Strength Reinforcement in Reinforced Concrete Design" has identified key design issues that are affected by the use of high-strength reinforcement. Also, ACI ITG-6, "Design Guide for the Use of ASTM A1035 Grade 100 Steel Bars for Structural Concrete" and NCHRP Report 679, "Design of Concrete Structures Using High-Strength Steel Reinforcement" have made progress towards identifying how code provisions in ACI 318 and AASHTO could be changed to incorporate high-strength reinforcement.
The current research aims to provide a closer investigation of the behavior of beams reinforced with high-strength steel bars (including ASTM A615 Grade 100 and ASTM A1035 Grades 100 and 120) and high-strength concrete up to 12000 psi. Focus of the research is on key design issues including: ductility, stiffness, deflection, and cracking.
The research includes an extensive review of current literature, an analytical study and conforming experimental tests, and is directed to provide a number of recommendations and design guidelines for design of beams reinforced with high-strength concrete and high-strength steel. Topics investigated include: strain limits (tension-controlled and compression-controlled, and minimum strain in steel); possible change for strength reduction factor equation for transition zone (Φ); evaluation of the minimum reinforcement ratio (þmin); recommendations regarding limiting the maximum stress for the high-strength reinforcement; and prediction of deflection and crack width at service load levels. Moreover, this research includes long-term deflection test of a beam made with high grade concrete and high-strength steel under sustained load for twelve months to evaluate the creep deflection and to insure the appropriateness of the current ACI 318 time-dependent factor, λ, which does not consider the yield strength of reinforcement and the concrete grade.
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Dabbagh, Hooshang Civil & Environmental Engineering Faculty of Engineering UNSW. „Strength and ductility of high-strength concrete shear walls under reversed cyclic loading“. Awarded by:University of New South Wales. School of Civil and Environmental Engineering, 2005. http://handle.unsw.edu.au/1959.4/27467.
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This study concerns the strength and behaviour of low-rise shear walls made from high-strength concrete under reversed cyclic loading. The response of such walls is often strongly governed by the shear effects leading to the shear induced or brittle failure. The brittle nature of high-strength concrete poses further difficulties in obtaining ductile response from shear walls. An experimental program consisting of six high-strength concrete shear walls was carried out. Specimens were tested under inplane axial load and reversed cyclic displacements with the test parameters investigated being longitudinal reinforcement ratio, transverse reinforcement ratio and axial load. Lateral loads, lateral displacements and the strains of reinforcement in edge elements and web wall were measured. The test results showed the presence of axial load has a significant effect on the strength and ductility of the shear walls. The axially loaded wall specimens exhibited a brittle behaviour regardless of reinforcement ratio whereas the specimen with no axial load had a lower strength but higher ductility. It was also found that an increase in the longitudinal reinforcement ratio gave an increase in the failure load while an increase in the transverse reinforcement ratio had no significant effect on the strength but influenced the failure mode. A non-linear finite element program based on the crack membrane model and using smeared-fixed crack approach was developed with a new aggregate interlock model incorporated into the finite element procedure. The finite element model was corroborated by experimental results of shear panels and walls. The finite element analysis of shear wall specimens indicated that while strengths can be predicted reasonably, the stiffness of edge elements has a significant effect on the deformational results for two-dimensional analyses. Therefore, to capture the deformation of walls accurately, three-dimensional finite element analyses are required. The shear wall design provisions given in the current Australian Standard and the Building Code of American Concrete Institute were compared with the experimental results. The comparison showed that the calculated strengths based on the codes are considerably conservative, specially when there exists the axial load.
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Meyer, Karl F. „Transfer and development length of 06-inch diameter prestressing strand in high strength lightweight concrete“. Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/20727.
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Islam, Md Shahidul. „Shear capacity and flexural ductility of reinforced high- and normal-strength concrete beams“. Thesis, Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1766536X.
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Reutlinger, Christopher George. „Direct pull-out capacity and transfer length of 06-inch diameter prestressing strand in high-performance concrete“. Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/19026.
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Shams, Mohamed Khalil. „Time-dependent behavior of high-performance concrete“. Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/20682.
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Chau, Siu-lee, und 周小梨. „Effects of confinement and small axial load on flexural ductility of high-strength reinforced concrete beams“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B31997661.
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Wong, Hin-cheong Henry, und 黃憲昌. „Effects of water content, packing density and solid surface area on cement paste rheology“. Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39326032.
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Philleo, Robert E. Freezing and thawing resistance of high-strength concrete. Washington, D.C: Transportation Research Board, National Research Council, 1986.
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Alca, Nedim. Effect of size on flexural behaviour of high-strength concrete beams. Edmonton, Alta: Dept. of Civil Engineering, University of Alberta, 1993.
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Carrasquillo, P. M. Guidelines for use of high strength concrete in Texas highways. Austin, Tex: Center for Transportation Research, Bureau of Engineering Research, University of Texas at Austin, 1986.
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Farrington, Erik Wayne. Creep and shrinkage of high performance concrete. [Austin]: Center for Transportation Research, Bureau of Engineering Research, University of Texas at Austin, 1996.
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USA-Australia Workshop on High Performance Concrete (1997 Sydney, N.S.W.). Proceedings of the USA-Australia Workshop on High Performance Concrete (HPC), Sydney, Australia, August 20-23, 1997. Perth, W.A: Curtin University of Technology, School of Civil Engineering, 1997.
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Byle, Kenneth Arlan. Time-dependent deformation behavior of prestressed high performance concrete bridge beams. [Austin, Tex.]: Center for Transportation Research, Bureau of Engineering Research, University of Texas at Austin, 1998.
Buchteile zum Thema "High strength concrete Testing":
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Jomaa’h, Muyasser M., Ali I. Salahaldin, Qahtan A. Saber und Aram M. Raheem. „Large Scale Laboratory Setup for Testing Structural Performance of Slender High-Strength Concrete Columns Subjected to Axial Load and Fire: A Preliminary Study“. In Geotechnical Engineering and Sustainable Construction, 611–26. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-6277-5_49.
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Xing, Feng, Wei Lun Wang und Zheng Liang Cao. „Shear Strength Equation for High-Strength Concrete RC beams with High Strength Stirrup“. In Environmental Ecology and Technology of Concrete, 706–12. Stafa: Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-983-0.706.
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Ollivier, J. P., V. Lumbroso, J. C. Maso und M. Massat. „Microcracking and Durability of High Strength Concrete“. In Brittle Matrix Composites 3, 269–77. Dordrecht: Springer Netherlands, 1991. http://dx.doi.org/10.1007/978-94-011-3646-4_29.
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Salamanova, Madina, Djokhar Medjidov und Aset Uspanova. „High-Strength Modified Concrete for Monolithic Construction“. In Lecture Notes in Civil Engineering, 45–53. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-10853-2_5.
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Lee, Ming-Gin, Yung-Chih Wang, Wei-Chien Wang, E. A. Yatsenko und Shou-Zjan Wu. „Clogging Resistance of High Strength Pervious Concrete“. In Lecture Notes in Civil Engineering, 347–57. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-87379-0_25.
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Otto, Corinne, Kerstin Elsmeier und Ludger Lohaus. „Temperature Effects on the Fatigue Resistance of High-Strength-Concrete and High-Strength-Grout“. In High Tech Concrete: Where Technology and Engineering Meet, 1401–9. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-59471-2_161.
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Shruthi, V. A., Ranjitha B. Tangadagi, K. G. Shwetha, R. Nagendra, C. Ranganath, Bharathi Ganesh und C. L. Mahesh Kumar. „Strength and Drying Shrinkage of High Strength Self-Consolidating Concrete“. In Lecture Notes in Civil Engineering, 615–24. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5195-6_48.
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Singh, Balraj, und Tanvi Singh. „Soft Computing-Based Prediction of Compressive Strength of High Strength Concrete“. In Applications of Computational Intelligence in Concrete Technology, 207–18. Boca Raton: CRC Press, 2022. http://dx.doi.org/10.1201/9781003184331-12.
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Suguna Rao, B., Ampli Suresh und Srikanth M. Naik. „Shrinkage Behavior of High-Strength Concrete Using Recycled Concrete Aggregate“. In Lecture Notes in Civil Engineering, 829–37. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-3317-0_74.
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Konferenzberichte zum Thema "High strength concrete Testing":
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„Toughness of fiber-Reinforced High-Strength Concrete from Notched Beam Tests“. In SP-155: Testing of Fiber Reinforced Concrete. American Concrete Institute, 1995. http://dx.doi.org/10.14359/927.
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„Microstructural Changes in High and Ultra High Strength Concrete Exposed to High Temperature Environments“. In SP-229: Quality of Concrete Structures and Recent Advances in Concrete Materials and Testing. American Concrete Institute, 2005. http://dx.doi.org/10.14359/14743.
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„Effects of Testing Variables on the Strength of High-Strength (90 Mpa) Concrete Cylinders“. In "SP-149: High-Performance Concrete - Proceedings, International Conference Singapore, 1994". American Concrete Institute, 1994. http://dx.doi.org/10.14359/4176.
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„Theoretical Model for Confined Steel-Fiber-Reinforced High-Strength Concrete“. In SP-229: Quality of Concrete Structures and Recent Advances in Concrete Materials and Testing. American Concrete Institute, 2005. http://dx.doi.org/10.14359/14742.
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Rizos, Dimitrios C. „High-Strength Reduced-Modulus High Performance Concrete (HSRM-HPC) for Prestressed Concrete Tie Applications“. In 2016 Joint Rail Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/jrc2016-5798.
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A High-Strength Reduced-Modulus High Performance Concrete (HSRM-HPC) for use in prestressed concrete rail ties has been developed by the authors. The HSRM-HPC material was originally considered for highway bridges but was rejected because of the accidental finding of the low modulus of elasticity. It is shown that the elastic modulus of the HSRM-HPC is reduced as much as 50% compared to the conventional HPC of the same strength while preserving all other properties of the conventional HPC. The use of the more flexible HSRM-HPC in concrete ties leads to reduced stress amplitudes and regularized stress fields at the rail seat area and the middle segment of the tie, which are the two most critical areas of tie failure. This work discusses the development and characterization of the HSRM HPC material, as well as current work on the performance assessment of such ties. The material development, material characterization, and performance assessment is conducted through experimental testing and computer simulations. The benefits of HSRM-HPC ties are quantified and discussed.
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Stein, Jeffrey, David R. Brill und Qiang Li. „Fatigue Testing of High Strength Concrete Beams at the National Airport Pavement Test Facility“. In Airfield and Highway Pavements 2015. Reston, VA: American Society of Civil Engineers, 2015. http://dx.doi.org/10.1061/9780784479216.042.
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„"Self Consolidating Concrete, High-Performance and Normal Concrete Affected by Creep at Different Age, Curing, Load Level, Strength, and Water-Cement Ratio with some Interrelated Properties"“. In SP-229: Quality of Concrete Structures and Recent Advances in Concrete Materials and Testing. American Concrete Institute, 2005. http://dx.doi.org/10.14359/14729.
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Bescher, Eric, John Kim und Michael McNerney. „On the Differences in Chemistry and Performance Between Types of Rapid Strength Concretes (RSCs)“. In 12th International Conference on Concrete Pavements. International Society for Concrete Pavements, 2021. http://dx.doi.org/10.33593/83main8q.
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Rapid-setting cements are used in concrete under a variety of acronyms (HES for High Early Strength concrete, or RSC for Rapid Strength Concrete, etc.). Their use is becoming increasingly important because our ageing highway and airport concrete infrastructure requires fast construction in order to minimize downtime. A simple but broad nomenclature for RSC concretes hides several important differences between materials. In some respects, there is no such thing as single RSC; there are several different types of RSCs with different mineralogies and characteristics. Specifications, appropriately so, focus on performance instead of chemical composition. One key RSC specification is early-age strength, for example 2.76 MPa (400 psi) flexural strength at 4 hours in order to re-open pavement to service. Yet, differences in materials usually result in differences in durability. For example, if only early strength is specified, what is the impact of mineralogical differences on other characteristics like freeze-thaw resistance or shrinkage? Protocols are also important: if pavement enters service at 4 hours, shouldn't a shrinkage measurement also start at 4 hours? Standard shrinkage testing protocols do not. This paper reviews the chemistry and hydration of three commercially available RSC materials (accelerated portland cement, belitic calcium sulfoaluminate cement and calcium sulfoaluminate blended with portland cement and calcium sulfates).
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Manning, Mark P., Brad D. Weldon und Craig M. Newtson. „Testing of an Ultrahigh-performance Concrete Overlay Developed Using Local Materials“. In IABSE Congress, New York, New York 2019: The Evolving Metropolis. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2019. http://dx.doi.org/10.2749/newyork.2019.1627.
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<p>The superior mechanical and durability properties of ultrahigh-performance concrete (UHPC) offer significant potential advantages when used as an overlay material—a common method for extending the service life of concrete bridge decks. Providing high compressive strength, improved environmental resistance, and increased service-life expectancy compared to conventional concretes, UHPC mixture proportions can be adapted using local materials. Flexural testing of a high-performance concrete (HPC; 66 MPa) prestressed channel beam bridge girder was conducted to investigate the use of nonproprietary UHPC (120 MPa) developed using materials primarily local to New Mexico, USA, for bridge deck overlays. The girder was first subjected to cyclic loading (minimum 1000 load-unload cycles to deflection-based service load conditions) to establish baseline performance and behavior. The girder surface was then textured, and a 25 mm nonproprietary UHPC overlay was cast. Cyclic loading was repeated for the girder-overlay system before loading the system to failure to investigate post-cracking flexural behavior. The UHPC overlay developed satisfactory bond with the HPC substrate without a bonding agent and exhibited no visible signs of distress or debonding after cyclic loading. Comparative analyses indicated increased stiffness and capacity for the girder- overlay system.</p>
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Mukesh, T. S. „Comparative Analysis on Mechanical Properties of Polymer Concrete by using Various Lightweight Aggregates“. In Sustainable Materials and Smart Practices. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901953-34.
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Abstract. The Polymer concrete is first established in the year of 1950s and gained popularity in 1970s repair works, building cladding and floors, as precasts components. The Polymer concrete has found applications in particularly specialised sectors due to its qualities such as high compression strength, quick curings, high specific strengths, and chemical resist. The objective of this experiment is to use destructive and non-destructive experiments to analyse the mechanical behaviour of Polymer concrete using various lightweight aggregates. Using destructive and non-destructive testing, this experiment evaluates mechanical characteristics of a lightweight polymeric concrete comprising four different types of polymeric ratios. The most important component is to reduce weight. Pumice, perlite, vermiculite, saw dust, and rice husk were utilized as light weight aggregates. Destructive tests revealed that raising the polymer ratio increased the compressive, impact strengths, and splitting-tensile, and the energy absorption of light weight polymer concrete. The properties such as ductility, impact energy, energy absorption shows decrease in efficiency. Pumice was discovered to have the best outcomes among the various lightweight aggregates. These study's findings are significant in understanding a performance of Lightweight polymer concrete and ensuring its safe deployment in a engineering applications which requires a high performance of strength to weight ratio material.
Berichte der Organisationen zum Thema "High strength concrete Testing":
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Lagergren, Eric S. Effects of testing variables on the measured compressive strength of high-strength (90 MPa) concrete. Gaithersburg, MD: National Institute of Standards and Technology, 1994. http://dx.doi.org/10.6028/nist.ir.5405.
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Phan, Long T., und Richard D. Peacock. Experimental plan for testing the mechanical properties of high-strength concrete at elevated temperatures. Gaithersburg, MD: National Institute of Standards and Technology, 1999. http://dx.doi.org/10.6028/nist.ir.6210.
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High-volume fly ash concrete (HVFAC) has improved durability and sustainability properties at a lower cost than conventional concrete, but its early-age properties like strength gain, setting time, and air entrainment can present challenges for application to concrete pavements. This research report helps with the implementation of HVFAC for pavement applications by providing guidelines for HVFAC mix design, testing protocols, and new tools for better quality control of HVFAC properties. Calorimeter tests were performed to evaluate the effects of fly ash sources, cement–fly ash interactions, chemical admixtures, and limestone replacement on the setting times and hydration reaction of HVFAC. To better target the initial air-entraining agent dosage for HVFAC, a calibration curve between air-entraining dosage for achieving 6% air content and fly ash foam index test has been developed. Further, a digital foam index test was developed to make this test more consistent across different labs and operators. For a more rapid prediction of hardened HVFAC properties, such as compressive strength, resistivity, and diffusion coefficient, an oxide-based particle model was developed. An HVFAC field test section was also constructed to demonstrate the implementation of a noncontact ultrasonic device for determining the final set time and ideal time to initiate saw cutting. Additionally, a maturity method was successfully implemented that estimates the in-place compressive strength of HVFAC through wireless thermal sensors. An HVFAC mix design procedure using the tools developed in this project such as the calorimeter test, foam index test, and particle-based model was proposed to assist engineers in implementing HVFAC pavements.
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Moser, Robert, Preet Singh, Lawrence Kahn, Kimberly Kurtis, David González Niño und Zackery McClelland. Crevice corrosion and environmentally assisted cracking of high-strength duplex stainless steels in simulated concrete pore solutions. Engineer Research and Development Center (U.S.), August 2021. http://dx.doi.org/10.21079/11681/41620.
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This paper presents a study of crevice corrosion and environmentally assisted cracking (EAC) mechanisms in UNS S32205 and S32304 which were cold drawn to tensile strengths of approximately 1300 MPa. The study utilized a combination of electrochemical methods and slow strain rate testing to evaluate EAC susceptibility. UNS S32205 was not susceptible to crevice corrosion in stranded geometries at Cl⁻ concentrations up to 1.0 M in alkaline and carbonated simulated concrete pore solutions. UNS S32304 did exhibit a reduction in corrosion resistance when tested in a stranded geometry. UNS S32205 and S32304 were not susceptible to stress corrosion cracking at Cl⁻ concentrations up to 0.5 M in alkaline and carbonated solutions but were susceptible to hydrogen embrittlement with cathodic overprotection.
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Sparks, Paul, Jesse Sherburn, William Heard und Brett Williams. Penetration modeling of ultra‐high performance concrete using multiscale meshfree methods. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/41963.
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Terminal ballistics of concrete is of extreme importance to the military and civil communities. Over the past few decades, ultra‐high performance concrete (UHPC) has been developed for various applications in the design of protective structures because UHPC has an enhanced ballistic resistance over conventional strength concrete. Developing predictive numerical models of UHPC subjected to penetration is critical in understanding the material's enhanced performance. This study employs the advanced fundamental concrete (AFC) model, and it runs inside the reproducing kernel particle method (RKPM)‐based code known as the nonlinear meshfree analysis program (NMAP). NMAP is advantageous for modeling impact and penetration problems that exhibit extreme deformation and material fragmentation. A comprehensive experimental study was conducted to characterize the UHPC. The investigation consisted of fracture toughness testing, the utilization of nondestructive microcomputed tomography analysis, and projectile penetration shots on the UHPC targets. To improve the accuracy of the model, a new scaled damage evolution law (SDEL) is employed within the microcrack informed damage model. During the homogenized macroscopic calculation, the corresponding microscopic cell needs to be dimensionally equivalent to the mesh dimension when the partial differential equation becomes ill posed and strain softening ensues. Results of numerical investigations will be compared with results of penetration experiments.
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Weiss, Charles, William McGinley, Bradford Songer, Madeline Kuchinski und Frank Kuchinski. Performance of active porcelain enamel coated fibers for fiber-reinforced concrete : the performance of active porcelain enamel coatings for fiber-reinforced concrete and fiber tests at the University of Louisville. Engineer Research and Development Center (U.S.), Mai 2021. http://dx.doi.org/10.21079/11681/40683.
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A patented active porcelain enamel coating improves both the bond between the concrete and steel reinforcement as well as its corrosion resistance. A Small Business Innovation Research (SBIR) program to develop a commercial method for production of porcelain-coated fibers was developed in 2015. Market potential of this technology with its steel/concrete bond improvements and corrosion protection suggests that it can compete with other fiber reinforcing systems, with improvements in performance, durability, and cost, especially as compared to smooth fibers incorporated into concrete slabs and beams. Preliminary testing in a Phase 1 SBIR investigation indicated that active ceramic coatings on small diameter wire significantly improved the bond between the wires and the concrete to the point that the wires achieved yield before pullout without affecting the strength of the wire. As part of an SBIR Phase 2 effort, the University of Louisville under contract for Ceramics, Composites and Coatings Inc., proposed an investigation to evaluate active enamel-coated steel fibers in typical concrete applications and in masonry grouts in both tension and compression. Evaluation of the effect of the incorporation of coated fibers into Ultra-High Performance Concrete (UHPC) was examined using flexural and compressive strength testing as well as through nanoindentation.
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Phan, L. T. Fire performance of high-strength concrete:. Gaithersburg, MD: National Institute of Standards and Technology, 1996. http://dx.doi.org/10.6028/nist.ir.5934.
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Duthinh, Dat. Shear strength of high-strength concrete walls and deep beams. Gaithersburg, MD: National Institute of Standards and Technology, 2000. http://dx.doi.org/10.6028/nist.ir.6495.
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A. M. Weidner, C. P. Pantelides, W. D. Richins und T. Dynamic Tests of High Strength Concrete Cylinders. Office of Scientific and Technical Information (OSTI), Oktober 2012. http://dx.doi.org/10.2172/1084653.
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Duthinh, Dat, und Nicholas J. Carino. Shear design of high-strength concrete beams:. Gaithersburg, MD: National Institute of Standards and Technology, 1996. http://dx.doi.org/10.6028/nist.ir.5870.
