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Journal articles on the topic 'Air entrainment in cement and cement mortars'

Author: Grafiati

Published: 6 September 2023

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1

Miera, Patrycja. "Air Content in Fresh Air-Entraining Cement Mortars." IOP Conference Series: Materials Science and Engineering 1203, no. 3 (2021): 032016. http://dx.doi.org/10.1088/1757-899x/1203/3/032016.

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Abstract The durability of a cement composite is the most important criterion for assessing this material. However, due to the durability of the cement composite, its frost resistance is an important property. In order to ensure concrete frost resistance, the European standard PN-EN 206-1: 2013 requires its aeration at the level of 4 - 7%. The Committee 201 of the American Concrete Institute (ACI) also requires the use of an air-entraining admixture in concretes exposed to frost damage. The amount of air-entraining admixture is significantly influenced by the composition of the cement used. In

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2

Tian, Ye, Zong Jin Li, Hong Yan Ma, Xian Yu Jin, and Nan Guo Jin. "Physical and Chemical Influence of Polyacrylate Latex on Cement Mortars." Advanced Materials Research 261-263 (May 2011): 807–11. http://dx.doi.org/10.4028/www.scientific.net/amr.261-263.807.

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In this research, the physical and chemical influence of polyacrylate (PA) latex on cement-based materials were studied using polymer modified mortars with polymer/cement (P/C) ratios of 0%, 5% and 10%. Physically, the mechanical performance of PA latex modified mortars was investigated with compression toughness energy and bending strength. Further more, a comparison of the pore structure and porosity between PA latex modified and unmodified mortars was conducted. The chemical reactions between PA polymer and cement hydrates were clarified with thermogravimetric (TG) analysis. It can be concl

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3

Riyazi, Siamak, John T. Kevern, and Matt Mulheron. "Super absorbent polymers (SAPs) as physical air entrainment in cement mortars." Construction and Building Materials 147 (August 2017): 669–76. http://dx.doi.org/10.1016/j.conbuildmat.2017.05.001.

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4

Tebbal, Nadia, Zine El Abidine Rahmouni, and Lamis Rabiaa Chadi. "Study of the Influence of an Air-Entraining Agent on the Rheology of Motars." MATEC Web of Conferences 149 (2018): 01054. http://dx.doi.org/10.1051/matecconf/201814901054.

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The objective of this study is to analyze the effect of the air entrainment on the fresh rheological properties as well as on the compressive mechanical resistances of the mortars. The hardened concrete contains a certain amount of randomly spread air, coming either from a drive during kneading or from the evaporation of the mixing water. The air quantity is in the order of 20 l / m3, ie 2% of the volume. However, the presence of a large volume of air bubbles causes the mechanical resistances to fall in compression. On the other hand, the use of air entrainment could improve the rheological pr

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5

Sun, Zhen Ping, Dan Mei Ye, Le Feng Fu, Bo Cun Zheng, Zhong Jun Feng, and Ming Chen. "Properties of Polyacrylic Ester Latex Modified Cement Mortar." Advanced Materials Research 687 (April 2013): 166–74. http://dx.doi.org/10.4028/www.scientific.net/amr.687.166.

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The water reducing performance, retarding effect, air entrainment, flexural and compressive strength of polyacrylic ester (PAE) latex modified cement mortar were investigated with fixed flow values. The research shows that PAE latex has water-reducing performance. The amount of water used in modified cement mortar decreases with increasing dosage of PAE latex. Because of the retarding effect, PAE latex delays the hydration process of cement. PAE latex has a strong effect of air entraining, and the air content of fresh mortar can be controlled by suitable dosage of defoamer. With the same air c

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6

Zhao, Ruohong, Yubin Weng, Christopher Tuan, and An Xu. "The Influence of Water/Cement Ratio and Air Entrainment on the Electric Resistivity of Ionically Conductive Mortar." Materials 12, no. 7 (2019): 1125. http://dx.doi.org/10.3390/ma12071125.

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Ionically-conductive mortar can be used for indoor radiant heating partition walls. In these applications, mortar blocks are soaked in electrolyte solutions of CuSO4. The surfaces of the block are coated with sealant and epoxy resin afterwards to prevent evaporation. The mortar block becomes a heating element due to ionic conduction if a voltage is applied to the electrodes in the block. Its electrical conductivity depends on the dispersion of the electrolyte, and hence on the porosity of the mortar. The test specimens in this study were divided into four groups according to the different air

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7

Wang, Rui, Lei Li, Wei Wang, Hong Song Wang, Yong Jing Jiang, and Da Pu Shen. "Influences and Properties of Mortar Modified by Waterborne Polyurethane Latexes." Advanced Materials Research 1129 (November 2015): 345–52. http://dx.doi.org/10.4028/www.scientific.net/amr.1129.345.

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Two waterborne polyurethane latexes with different tensile strength were employed to modify mortar and the properties of mortar including air entrainment, setting behavior, compressive and flexural strength were investigated. The results show that curing methods, polymer-cement ratio and water-cement ratio have a significant impact on the compressive and flexural strength. The strength of mortar increased under dry curing condition in the range of the polymer-cement ratio from 0.005 to 0.05 (by weight) at water-cement ratio of 0.5. The hydration of the cement containing waterborne polyurethane

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8

Zuo, Shenghao, Qiang Yuan, Tingjie Huang, Zan Wang, Kai Zhang, and Jing Liu. "Rheology and air entrainment of fresh Portland cement mortars in simulated low air pressure environments." Cement and Concrete Composites 135 (January 2023): 104848. http://dx.doi.org/10.1016/j.cemconcomp.2022.104848.

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9

Łazniewska-Piekarczyk, Beata, and Janusz Szwabowski. "THE INFLUENCE OF THE TYPE OF ANTI-FOAMING ADMIXTURE AND SUPERPLASTICIZER ON THE PROPERTIES OF SELF-COMPACTING MORTAR AND CONCRETE." Journal of Civil Engineering and Management 18, no. 3 (2012): 408–15. http://dx.doi.org/10.3846/13923730.2012.698908.

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To prevent excessive air entrainment, superplasticizers (SPs) should not only be compatible with cement, but also should not create the air-entraining effect in mortar. In order to counteract excessive air entrainment, anti-foaming admixtures (AFAs) can be used to prevent the formation of air bubbles. This paper investigates the influence of the type, amount and time of introduction of AFAs on air-entrainment, rheological properties and workability loss of self-compacting mortar. The research results prove that AFAs decrease air-content in mortar. Mortar containing an AFA does not undergo segr

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10

Chen, Xin, Xu Liu, Bo Tian, Yong Ge, and Lihui Li. "Effect of Low Atmospheric Pressure on Air Entrainment in Cement-Based Materials: An On-Site Experimental Study at Different Elevations." Materials 13, no. 18 (2020): 3975. http://dx.doi.org/10.3390/ma13183975.

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The efficiency and stability of air entrainment in concrete are sometimes found to be weaker at higher elevation. This phenomenon was attributed to the low atmospheric pressure by many researchers, however, the level of influence of atmospheric pressure on concrete air content dramatically varied among different studies. In order to clarify the effect of low atmospheric pressure on air entrainment in cement-based materials, an on-site experimental study was conducted with a rigorous control of irrelevant variables. The study focused on the air-entraining efficiency in cement paste, mortar, and

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Kumar, Shiv. "Effect of Sugar Waste on Cement Concrete." International Journal for Research in Applied Science and Engineering Technology 9, no. 9 (2021): 1353–60. http://dx.doi.org/10.22214/ijraset.2021.38124.

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Abstract: This investigation deals with the effects of the sugar- waste (Molasses) on the cement concrete. Studies were carried out on a cement paste, the types of different mortar mixes and five types of different concrete mixes, with and without the use of molasses. Molasses is one among the four types of sugar waste and it contains 40-60 percent of total sugar content depending upon types of molasses. While other sugar waste are Bassage, pressed mud and Discharging water containing mud. Among these wastes first two contains 3 percent of sugar and three contains negligible percent of sugar.

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12

Guo, Jinjun, Yanling Yan, Juan Wang, and Yaoqun Xu. "Strength Analysis of Cement Mortar with Carbon Nanotube Dispersion Based on Fractal Dimension of Pore Structure." Fractal and Fractional 6, no. 10 (2022): 609. http://dx.doi.org/10.3390/fractalfract6100609.

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Carbon nanotubes (CNTs) are considered among the ideal modifiers for cement-based materials. This is because CNTs can be used as a microfiber to compensate for the insufficient toughness of the cement matrix. However, the full dispersion of CNTs in cement paste is difficult to achieve, and the strength of cement material can be severely degraded by the high air-entraining property of CNT dispersion. To analyze the relationship between the gas entrainment by CNT dispersion and mortar strength, this study employed data obtained from strength and micropore structure tests of CNT dispersion-modifi

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13

Zeng, Xiao-Hui, Xu-Li Lan, Hua-Sheng Zhu, et al. "Using stirring power curves to investigate the air-entrainment and mechanical properties of cement mortar at low air pressure." Construction and Building Materials 378 (May 2023): 131142. http://dx.doi.org/10.1016/j.conbuildmat.2023.131142.

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14

Zhou, Dongliang, Han Yan, Yong Yang, et al. "Investigation of the Effect of Particle Surface Charge and Dispersion Stability on Latex Behavior in Cement Using Non-Ionic and Traditional Latexes." Materials 15, no. 17 (2022): 6145. http://dx.doi.org/10.3390/ma15176145.

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In this work, a novel total non-ionic polystyrene-polyurethane (PS-PU) composite latex was synthesized with polymerizable polyethylene glycol ether. Contrary to traditional styrene-butyl acrylate latex (St-BA), PS-PU has a smaller size and superior dispersion stability, and it is stable in saturated Ca(OH)2 even after 72 h. In fresh-mixed mortars, PS-PU showed a little adverse effect on workability and insignificant air entrainment, with little defoamer consumption. The retardation effect of PS-PU is also much milder than traditional St-BA. As for strength, PS-PU showed a less adverse effect o

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15

Stenechkina, Kseniya. "The use of superplasticizers in multicomponent concrete mixtures." E3S Web of Conferences 389 (2023): 01032. http://dx.doi.org/10.1051/e3sconf/202338901032.

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In addition to the positive effect of the introduction of a superplasticizer, there are also negative ones: an increase in the period of structure formation, a significant air entrainment and, as a result, a decrease in strength. One of the ways to reduce the negative impact on the structure and properties of concrete composites is the method of preparing a suspension, which consists in first dissolving 10% of the amount of cement in all the mixing water in a concrete mixer for 1-2 minutes. Then load the rest of the cement and aggregate. Preliminary dissolution in water mixing with superplasti

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16

de Bem, Diogo Henrique, Daniel Petzold Barbosa Lima, and Ronaldo A. Medeiros-Junior. "Effect of chemical admixtures on concrete’s electrical resistivity." International Journal of Building Pathology and Adaptation 36, no. 2 (2018): 174–87. http://dx.doi.org/10.1108/ijbpa-11-2017-0058.

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PurposeThe purpose of this paper is to verify the influence of superplasticizer and air entrainment admixtures (AEs) in the electrical resistivity of concrete.Design/methodology/approachTen different types of concrete have been studied. Three levels of superplasticizer and air AEs have been used (0.20, 0.35 and 0.50 per cent). Concrete samples were cast and the electrical resistivity was monitored at the ages of 28, 63 and 91 days. Compressive strength and density tests have also been executed.FindingsThe superplasticizer admixture presented an optimal level of 0.35 per cent that significantly

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17

Tuskaeva, Zalina, and Soslan Karyaev. "Influence of various additives on properties of concrete." E3S Web of Conferences 164 (2020): 14007. http://dx.doi.org/10.1051/e3sconf/202016414007.

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A comparative analysis of concrete samples without chemical additives and three concrete samples with additives was carried out The first sample contains the liquid additive, the other two contain the powder additive. The article aims at finding out the effectiveness of additives influence on the physical and mechanical properties of concrete and the basis for the application areas of modified types of concrete. By means of laboratory tests, the physical and mechanical properties of concrete mixtures are determined. To determine the strength characteristics of concrete samples, the IM-1250M te

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18

Coutts, R. S. P. "Air-cured woodpulp, fibre/cement mortars." Composites 18, no. 4 (1987): 325–28. http://dx.doi.org/10.1016/0010-4361(87)90296-5.

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19

Dvorkin, Leonid, Patrycja Duży, Karolina Brudny, Marta Choińska, and Kinga Korniejenko. "Adhesive Strength of Modified Cement–Ash Mortars." Energies 15, no. 12 (2022): 4229. http://dx.doi.org/10.3390/en15124229.

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The main aim of this article, carried out in relation to ash-cement mortars, is to determine the effect of complex additives of polyfunctional modifiers, including, in addition to superplasticizers, air-entraining and water-retaining additives, at different values of water–cement ratios. With the use of experimental–statistical models, the complex effect on the adhesive strength of cement–ash mortars of water–cement and ash–cement ratios, as well as complex additives of polyfunctional modifiers, including air-entraining and water-retaining additives, is considered. The extreme nature of the wa

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20

Nikoloutsopoulos, Nikolaos D., Sofia P. Nikolopoulou, and Zacharias G. Pandermarakis. "Strength of Polypropylene Fiber Reinforced Cement Mortar Composites with Variable Water/Cement Ratio." Materials Science Forum 1042 (August 10, 2021): 157–63. http://dx.doi.org/10.4028/www.scientific.net/msf.1042.157.

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For cement mortars the reinforcement techniques by randomly distributed short fibers, contribute highly to their micro-cracking stabilization and to improvement of their flexibility and tensile strength. Among the wide different types of short fiber reinforcement that have been used in the past for mortars, those made of steel, polymers and natural fibers dominate the area. It is a common sense that the reinforcement of mortars by polypropylene fibers (PP) is considered a very efficient method for reducing their curing shrinkage and enhanced toughness and strength of un-reinforced cemented mat

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21

Marczewska, Julia. "Influence of the fly ash and the prior freezing and thawing on the sulphate resistance of cement mortars." MATEC Web of Conferences 174 (2018): 02004. http://dx.doi.org/10.1051/matecconf/201817402004.

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The use of fly ash for the production of cement is a typical example of the utilization of by-products (waste) from various fields of production in construction, a significant reduction of CO2 emissions and reduction of energy consumption. However, in order to be able to determine the suitability of this additive in construction, it is necessary to examine the durability of cement composites with fly ash in various, often complicated, destructive environments. There are known publications regarding the durability of concretes with fly ash in individual environments. However, in natural conditi

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22

Knap, Monika, and Wojciech Piasta. "Effect of sulphate corrosion on the durability of air-entrained cement mortars." MATEC Web of Conferences 174 (2018): 02012. http://dx.doi.org/10.1051/matecconf/201817402012.

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Sulphate corrosion is a complex sequence of chemical and physical processes that, when the aqueous sulphate solutions are exposed for a sufficiently long time, irreversibly destroys the microstructure of cement paste. In order to determine the durability of Portland cement mortars, mortar resistance tests were carried out on a 5% solution of sodium sulphate by measuring linear deformations. The tests included 1 series of non air-entrained mortars and 3 series of air-entrained mortars with air content: 7%, 10% and 13%. The biggest deformations were observed for non air-entrained samples, the sm

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23

Maia Pederneiras, Cinthia, Rosário Veiga, and Jorge de Brito. "Physical and Mechanical Performance of Coir Fiber-Reinforced Rendering Mortars." Materials 14, no. 4 (2021): 823. http://dx.doi.org/10.3390/ma14040823.

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Coir fiber is a by-product waste generated in large scale. Considering that most of these wastes do not have a proper disposal, several applications to coir fibers in engineering have been investigated in order to provide a suitable use, since coir fibers have interesting properties, namely high tensile strength, high elongation at break, low modulus of elasticity, and high abrasion resistance. Currently, coir fiber is widely used in concrete, roofing, boards and panels. Nonetheless, only a few studies are focused on the incorporation of coir fibers in rendering mortars. This work investigates

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24

Kuziak, Justyna, Kamil Zalegowski, Wioletta Jackiewicz-Rek, and Emilia Stanisławek. "Influence of the Type of Cement on the Action of the Admixture Containing Aluminum Powder." Materials 14, no. 11 (2021): 2927. http://dx.doi.org/10.3390/ma14112927.

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The study of the effect of cement type on the action of an admixture increasing the volume of concrete (containing aluminum powder), used in amounts of 0.5–1.5% of cement mass, was presented. The tests were carried out on cement mortars with Portland (CEM I) and ground granulated blast-furnace slag cement (CEM III). The following tests were carried out for the tested mortars: the air content in fresh mortars, compressive strength, flexural strength, increase in mortar volume, bulk density, pore structure evaluation (by the computer image analysis method) and changes in the concentration of OH−

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25

Janus, Magdalena, Szymon Mądraszewski, Kamila Zając, Ewelina Kusiak-Nejman, Antoni W. Morawski, and Dietmar Stephan. "Photocatalytic Activity and Mechanical Properties of Cements Modified with TiO2/N." Materials 12, no. 22 (2019): 3756. http://dx.doi.org/10.3390/ma12223756.

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In this paper, studies of the mechanical properties and photocatalytic activity of new photoactive cement mortars are presented. The new building materials were obtained by the addition of 1, 3, and 5 wt % (based on the cement content) of nitrogen-modified titanium dioxide (TiO2/N) to the cement matrix. Photocatalytic active cement mortars were characterized by measuring the flexural and the compressive strength, the hydration heat, the zeta potential of the fresh state, and the initial and final setting time. Their photocatalytic activity was tested during NOx decomposition. The studies showe

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26

Gołaszewska, Małgorzata, Jacek Gołaszewski, Jerzy Bochen, and Grzegorz Cygan. "Comparative Study of Effects of Air-Entraining Plasticizing Admixture and Lime on Physical and Mechanical Properties of Masonry Mortars and Plasters." Materials 15, no. 7 (2022): 2583. http://dx.doi.org/10.3390/ma15072583.

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This article presents research on selected physical and mechanical properties of cement-based plasters and masonry mortars with consistency-improving additives, namely, traditional hydrated lime and a plasticizing and aerating mixture (APA), which, in practice, is often considered to be a lime substitute. Comparative analysis of the properties of mortars with alternative additives—lime or APA—was carried out, taking into consideration possible effects of cement, as two types of Portland cement were used for the research. For fresh mortar, mixture consistency, air content, resistance to segrega

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Camarini, Gladis, Valdir Moraes Pereira, Pedro Murilo Gonçalves de Freitas, and Regina Andrade Tirello. "Methods to Measure the Transfer Properties of Mortars." Applied Mechanics and Materials 148-149 (December 2011): 184–87. http://dx.doi.org/10.4028/www.scientific.net/amm.148-149.184.

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The search for techniques and materials able to improve structure quality and durability has lead to research some methods that are able to measure the transfer properties of composites. Cement type has an important influence on mortar performance, and chemical and physical deteriorations modify microstructure, and thereby transfer properties. The aim of this work is to evaluate two methods which can measure the transfer properties of cement based materials: capillary absorption and air permeability tests in mortars produced with blastfurnace slag Portland cement. The relationship between thes

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Jaworska-Wędzińska, Monika, and Iga Jasińska. "Durability of Mortars with Fly Ash Subject to Freezing and Thawing Cycles and Sulfate Attack." Materials 15, no. 1 (2021): 220. http://dx.doi.org/10.3390/ma15010220.

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Destruction of cement composites occurs due to the alternate or simultaneous effects of aggressive media, resulting in the destruction of concrete under the influence of chemical and physical factors. This article presents the results of changes in the measurement of linear strains of samples and changes in the microstructure of cement after 30 freezing and thawing cycles and immersed in 5% sodium sulfate solution. The compressive strengths ratios were carried out at the moment when the samples were moved to the sulfate solution after 30 cycles and at the end of the study when the samples show

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29

Spychał, Edyta, and Anna Kotwa. "ASSESSMENT OF THE POSSIBILITY OF USING CHALCEDONITE POWDER AS A COMPONENT OF MORTARS." Structure and Environment 14, no. 4 (2022): 119–25. http://dx.doi.org/10.30540/sae-2022-014.

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The article presents the results of the assessment of the possibility of using chalcedonite powder as a partial replacement for cement in mortars. Portland cement CEM I 42.5 R was used as a binder, which was replaced in the amount of 5%, 20%, 35% and 50% with chalcedonite powder. The experimental tests concerned the determination of the technological and mechanical properties of mortars: consistency, air content, compressive and bending strength, supplemented by X-ray diffraction analysis and calorimetric measurements of the pastes. The research results indicate that chalcedonite powder can be

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30

Chajec, Adrian. "Granite Powder vs. Fly Ash for the Sustainable Production of Air-Cured Cementitious Mortars." Materials 14, no. 5 (2021): 1208. http://dx.doi.org/10.3390/ma14051208.

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The partial replacement of cement in concrete with the addition of granite powder and fly ash can help to reduce the carbon dioxide (CO2) emissions into the atmosphere associated with cement production. The aim of the article is to compare the performance of granite powder and fly ash for the sustainable production of air-cured cementitious mortars. The morphological, chemical, and granulometric properties of these additives were first compared with the properties of cement. Afterward, a series of mortars modified with the addition of granite powder and fly ash was made. The properties of the

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Spychał, Edyta, and Piotr Stępień. "Effect of Cellulose Ether and Starch Ether on Hydration of Cement Processes and Fresh-State Properties of Cement Mortars." Materials 15, no. 24 (2022): 8764. http://dx.doi.org/10.3390/ma15248764.

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The production of factory-made mortars is a multicomponent system. Viscosity-modifying admixtures (VMAs) are an inherent ingredient of these materials. The correct choice of the amount and type of these admixtures is important from the practical and scientific points of view. In this article, the use of cellulose ether (CE) and starch ether (SE) in cement pastes and mortars is studied. This research focuses on the hydration process and fresh-state properties of mortars because this subject determines the correct choice of the amount and type of admixture used, and the results determine the app

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Liu, Si Feng, and Pei Ming Wang. "Early-Age Free Shrinkage of Mortars with Different Dosages of EVA Redispersible Powder." Key Engineering Materials 539 (January 2013): 49–54. http://dx.doi.org/10.4028/www.scientific.net/kem.539.49.

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The plastic free shrinkage evolutions of mortars in the presence of different dosages of redispersible Ethylene-vinyl acetate (EVA) copolymer powder were measured using the laser sensor at acceleration dry for 6 hours. The effects of temperature, relative humidity, air contents and water evaporation of mortars on the plastic free shrinkage were observed. The plastic free shrinkage of mortars declines firstly and then rise under the increasing dosage of EVA powder in range of 1%~10% mass of cement in mortars, the plastic free shrinkage of mortars with 10% EVA powder was almost closed to that of

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Dinler, Ebru. "An evaluation of cooling Portland cement mortars exposed to high temperature, by using firefighting foam." Cement Wapno Beton 27, no. 6 (2023): 425–35. http://dx.doi.org/10.32047/cwb.2022.27.6.5.

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The purpose of this study was to investigate the effects of cooling Portland cement mortars exposed to high temperature, with synthetic high-expansion firefighting foam. In this experimental study, mortar samples produced with Portland cement CEM I 42,5R, Rilem-Cembureau sand and tap water were first subjected to water curing for 28, 90 and 180 days and then exposed to 20°C, 150°C, 300°C, 500°C and 700°C for 3 hours, respectively. Cement mortars exposed to high temperatures were cooled with high expansion firefighting foam and the resulting flexural strength and compressive strengths were eval

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Łaźniewska-Piekarczyk, Beata. "The Influence of W/C Ratio and Superplasticizer Type on Porosity of Concrete with Air-Entraining Cement with Fly Ash." Solid State Phenomena 279 (August 2018): 266–70. http://dx.doi.org/10.4028/www.scientific.net/ssp.279.266.

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The research results of stability of air-entrainment of concrete acc. PN-EN 480-1 in case of innovate air-entraining multi-component cement CEM II/B-V is presented in the paper. The influence of PCE, naphthalene and phosphonamidite based superplasticizers and w/c ratio: 0.45, 0.50 and 0.55 on air-entrainment and consistency of fresh concrete mix was investigated. The research results indicated that with increasing w/c ratio the air-entrainment of concrete increases. Moreover, in case of an increase in the degree of liquidity of the air-entrained concrete made of participation of the innovative

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35

Kravchenko, Igor, Mihail Erofeev, Aleksandr Fedorov, et al. "Research of Mechanochemical Processes of Activation of Building Materials by Air-Impact Method." E3S Web of Conferences 304 (2021): 02009. http://dx.doi.org/10.1051/e3sconf/202130402009.

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To increase the specific surface area of the binder and accelerate the strength gain of fast-hardening concrete mixtures, a model has been created for calculating aeroactivators as part of mobile complexes based on new equipment for cement activation, sand enrichment, local materials, and production waste. The proposed model establishes the dependence of the rate of destruction of the dusty shell of particles on the mechanical impact of the beaters and materials` physical and mechanical characteristics. To improve the operational characteristics of the cement aeroactivator, experimental studie

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Baran, Edyta, Mariusz Hynowski, Łukasz Kotwica, and Jacek Rogowski. "Effect of Portland Cement on the Selected Properties of Flue Gas Desulfurization Gypsum-Based Plasters." Materials 16, no. 14 (2023): 5058. http://dx.doi.org/10.3390/ma16145058.

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The introduction of the European Union’s climate change legislation and the intended use of renewable energy sources instead of fossil fuels will significantly reduce the production of flue gas desulfurization (FGD) gypsum used as the raw material for gypsum mortar plasters’ production. This has forced mortar producers to look for alternative materials, including gypsum–cement composites. This work investigated the mechanical strength and linear extension of four gypsum–cement mortars with the gypsum content reduced to 30%. The authors showed that the cement admixture of 6 to 12% introduced in

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Sanytsky, Myroslav, Tetiana Kropyvnytska, Roman Kotiv, Mykola Bevz, and Stanislav Fic. "Suitability of modified low carbon Roman cements for architectural restoration." E3S Web of Conferences 280 (2021): 07002. http://dx.doi.org/10.1051/e3sconf/202128007002.

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Article is devoted to the investigation of suitability of low carbon Roman cement for restoration and finishing works. The history of the development of Roman cement as a natural hydraulic binder, which was commonly used to decorate building facades in the 19th and early 20th centuries, is presented. The properties of mortars based on Roman cement make it an excellent product for architectural restoration and conservation, as they are characterized by fast setting, high porosity typical for lime mortars, high resistance to weather conditions, high initial strength. At the same time, due to the

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Polverino, Salvatore, Antonio Esau Del Rio Castillo, Antonio Brencich, Luigi Marasco, Francesco Bonaccorso, and Renata Morbiducci. "Few-Layers Graphene-Based Cement Mortars: Production Process and Mechanical Properties." Sustainability 14, no. 2 (2022): 784. http://dx.doi.org/10.3390/su14020784.

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Cement is the most-used construction material worldwide. Research for sustainable cement production has focused on including nanomaterials as additives to enhance cement performance (strength and durability) in recent decades. In this concern, graphene is considered one of the most promising additives for cement composites. Here, we propose a novel technique for producing few-layer graphene (FLG) that can fulfil the material demand for the construction industry. We produced specimens with different FLG loadings (from 0.05% to 1% by weight of cement) and curing processes (water and saturated ai

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Azevedo, Afonso, Thuany Lima, Noan Simonassi, Matheus Pereira Ribeiro, Fabio Garcia Filho, and Sergio Monteiro. "Piassava Fiber: A Novel Reinforcement for Cement-Based Matrix Composites." Concilium 22, no. 1 (2022): 379–90. http://dx.doi.org/10.53660/clm-150-166.

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The addition of 2 and 5 wt% of piassava fiber, a natural lignocellulosic fiber extracted from a Brazilian palm tree botanically named Attallea funifera, into cement-based matrix composites was investigated. Both alkali-treated piassava fibers by NaOH and non-treated fibers were embedded in Portland cement, lime, and sand to fabricate mortars intended for civil construction. The non-aged fresh mortars were tested for paste consistency, water retention, and relative volume of incorporated air. Preliminary results showed that the addition of NaOH-treated piassava slightly increased the water rete

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Vyšvařil, Martin, Libor Topolář, and Richard Dvořák. "Acoustic insulation properties of lime mortars with natural lightweight aggregate." MATEC Web of Conferences 282 (2019): 02075. http://dx.doi.org/10.1051/matecconf/201928202075.

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Porous pozzolan-active aggregate can be used to prepare lightweight lime mortars with high ability to salt accumulation from masonry, enhanced strengths and improved their acoustic and thermal insulation properties, or fire resistance. In this study, the effect of 3 types of natural lightweight aggregate on acoustic insulation properties of air lime mortars, NHL mortars, and cement-lime mortars has been investigated. Measurements of the signal attenuation in the frequency range of 16 Hz to 16 kHz showed the appreciable effect of binder and aggregate used in the mortars. Pumiceous aggregate cau

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Sequeira, Lucas, Blas Cantero, Miguel Bravo, Jorge de Brito, and César Medina. "The Influence of Recycled Cement, Fly Ash, and Magnesium Oxide on the Mechanical Performance of Sustainable Cementitious Materials." Materials 16, no. 7 (2023): 2760. http://dx.doi.org/10.3390/ma16072760.

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In the construction industry, cement is the most widely used material. So, to achieve greater sustainability in this industry, it is imperative to improve the sustainability of this material. One way to reduce the ecological footprint of cement is to replace it, even if partially, with other more sustainable materials that can act as binders. This paper analyses the mechanical properties of more sustainable mortars containing recycled cement (RC), fly ash (FA), and magnesium oxide (MgO). Different types of binary, ternary, and quaternary mortars were used: containing recycled cement (5% and 10

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Tarhan, Yeşim, and Remzi Şahin. "Fresh and Rheological Performances of Air-Entrained 3D Printable Mortars." Materials 14, no. 9 (2021): 2409. http://dx.doi.org/10.3390/ma14092409.

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The effect of air-entraining admixture (AEA) on the fresh and rheological behavior of mortars designed to be used in 3D printers was investigated. Blast furnace slag, calcined kaolin clay, polypropylene fiber, and various chemical additives were used in the mortar mixtures produced with Super White Cement (CEM I 52.5 R) and quartz sand. In addition to unit weight, air content, and compressive strength tests, in order to determine the stability of 3D printable mortar elements created by extruding layer by layer without any deformation, extrudability, buildability, and open time tests were appli

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Rattanaveeranon, Santi, Sarote Dumrongsil, and Knavoot Jiamwattanapong. "Effect of Latex Rubber and Rubber Powder as an Admixture on Bending Strength of Cement Mortars." Applied Mechanics and Materials 891 (May 2019): 180–86. http://dx.doi.org/10.4028/www.scientific.net/amm.891.180.

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This paper reported the effect of latex rubber (LR) and rubber powder (RP) on the bending strength of cement mortars containing fly ash silica (FAS) prepared from sugarcane bagasse. The bending strengths of the cement mortars with the addition of LR and RP were compared. The study was conducted by adding 5-10 wt% of each admixture into cement mortar specimens and left in air atmosphere for 28 days before measuring their bending strength. At 5 wt.%, both LR or RP could significantly reinforce the bending strength of the mortar. The bending strength of cement mortars decreased when the proportio

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Tassos, Christos, Kosmas Sideris, Alexandros Chatzopoulos, Nikolaos Pistofidis, and Emmanouil Chaniotakis. "Influence of cement type on carbonation of concrete mixtures." MATEC Web of Conferences 163 (2018): 05005. http://dx.doi.org/10.1051/matecconf/201816305005.

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This research aims to investigate the influence of cement type to carbonation. For this purpose mixtures of four different cement mortars and eight different concretes that have been prepared with four different cements were left exposed for one year in open air in northern Greece. Results indicate that the type of cement influences the carbonation rate. Concrete mixtures produced according to the definitions of EN 206 standard perform lower service life against carbonation induced corrosion if the choice of the cement type is not carefully examined.

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Kim, Hayeon, and H. M. Son. "Effects of Air Entrainment on Bacterial Viability in Cement Paste." Materials 15, no. 6 (2022): 2163. http://dx.doi.org/10.3390/ma15062163.

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This study investigated the effect of air entrainment (AE) on bacterial viability in cementitious materials. Specimens were fabricated with Portland cement, urea, calcium lactate, and ureolytic bacteria, and with varying amounts of an AE agent. Specimens with different amounts of the AE agent were fabricated, and then a compressive strength test, quantitative polymerase chain reaction, X-ray diffraction, and thermogravimetry were used to investigate the mechanical properties, viability of bacteria, and hydrates of the specimens. The highest compressive strength was achieved by the specimen wit

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Sypek, Maciej, Rafał Latawiec, Beata Łaźniewska-Piekarczyk, and Waldemar Pichór. "Impact of Surfactant and Calcium Sulfate Type on Air-Entraining Effectiveness in Concrete." Materials 15, no. 3 (2022): 985. http://dx.doi.org/10.3390/ma15030985.

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The paper presents the evaluation of the influence of calcium sulfate on the air void microstructure in concrete and its action mechanism depending on the character of the air-entraining agent. Gypsum dehydration has been previously proven to negatively influence the air void structure of air-entrained concrete. Ettringite, nucleating from tricalcium aluminate and calcium sulfate, influences the adsorption and mode of action of anionic-based polycarboxylate ether admixtures. The authors suspected the admixture’s air-entraining mechanism was also affected by these characteristics. Gypsum dehydr

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Berkak, Hichem, Zoubir Makhloufi, Madani Bederina, Abdellah Demdoum, and Yacine Hadj Aissa. "Physico-mechanical characterization of composite cementitious mortars modified by resin containing antifoam." MATEC Web of Conferences 149 (2018): 01067. http://dx.doi.org/10.1051/matecconf/201814901067.

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Nowadays, polymer-modified mortars (PMM) are generally used in the field of building as finishing materials. In general, The properties of the fresh and hardened PMC are affected by several factors that tend to interact each other: the nature of materials used as latex, cement and aggregates; the mix proportions (W/C, polymer/cement ratio, etc.); air content; type and amount of surfactants and anti-foaming; and curing methods. This present experimental work aims to study the influence of the rate of partial substitution of cement by resin containing anti-foaming on the properties of composite

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Casali, Juliana Machado, Fernanda Domigues Melo, Vitoria Carminatti Serpa, Alexandre Lima de Oliveira, Andrea Murillo Betioli, and Luciana Maltez Lengler Calçada. "Influence of cement type and water content on the fresh state properties of ready mix mortar." Ambiente Construído 18, no. 2 (2018): 33–52. http://dx.doi.org/10.1590/s1678-86212018000200241.

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Abstract The main characteristic of ready mix mortar is to remain workable for up to 72hours after mixing. This greater duration of workability is obtained by use of hydration stabilizing admixtures and air-entrained admixtures. Thus, the behavior of this mortar depends on the compatibility between Portland cement and these two admixtures. Within this context, the objective of this article is to evaluate the influence of Portland cement type and water content on the properties of ready mix mortars in fresh state. Three types of Portland cement and four water/dry material ratios were evaluated.

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Cantero, Blas, Miguel Bravo, Jorge de Brito, Isabel Fuencisla Sáez del Bosque, and César Medina. "The Influence of Fly Ash on the Mechanical Performance of Cementitious Materials Produced with Recycled Cement." Applied Sciences 12, no. 4 (2022): 2257. http://dx.doi.org/10.3390/app12042257.

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Concrete is the most widely used construction material in the world; as such, the best way to promote a more sustainable construction industry is to improve the environmental performance of this material. Since cement production is the main source of the high environmental impact of concrete, due to the high calcination temperature that clinker requires, replacing this binder with recycled cement would allow for the establishment of a new concrete design with a much lower ecological footprint. This research intends to analyse the mechanical performance of mortars with recycled cement and fly a

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Vyšvařil, Martin, Michaela Hegrová, and Tomáš Žižlavský. "Influence of Cellulose Ethers on Fresh State Properties of Lime Mortars." Solid State Phenomena 276 (June 2018): 69–74. http://dx.doi.org/10.4028/www.scientific.net/ssp.276.69.

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Cellulose ethers (CEs) are widely used as viscosity enhancing, water retaining additives in cement based mortars. Nevertheless, studies about the effect of cellulose ethers on the properties of aerial lime-based mortars are very lack. The use of water retaining additives in lime mortars can influence not only their fresh state properties but also the pore structure and strength of hardened mortars. In this work, four different commercial cellulose ethers were added to lime mortars in order to test their influence on properties of mortars in the fresh state. Mortar rheological parameters (relat

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