The impact of carboxylic acid type hydrophobic agent on compressive strength of cementitious materials

Zhang, Hao; Mu, Song; Cai, Jingshun; Chen, Ruixing

doi:10.1016/j.conbuildmat.2021.123315

Cited by 12 publications

(2 citation statements)

References 14 publications

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“…The molecules of the water-reducing agent break down in water into macromolecular anions and adsorb on the surface of the hydration products of the cement particles. Then, the electrostatic repulsion between particles increases, which damages and prevents flocculation in the system's structure and increases the amount of free water in the system, thereby increasing the paste microviscosity [32]. The addition of a polycarboxylic acid water-reducing agent can simultaneously generate an irregular sheet structure in the C-S-H structure, improve the pore structure of mortar, and increase the mortar's water resistance and impermeability [33,34].…”

Section: The Effect Of Interaction On the Working Performance Of Poly...mentioning

confidence: 99%

Design and preparation of high-performance polymer mortars based on performance prediction model

Wang

et al. 2022

Mater. Res. Express

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This article had presented a systematic and adjustable method to forecast the performance of certain type of polymer mortars, most of all, using the performance prediction model to accurately control the dosages of water reducing agent (DWR), cellulose (DC), polypropylene fiber (DF), expansion agent (DEA), redispersible emulsion powder (DREP), and cement content (CC), according to the changes of properties of polymer mortars. The article had given a full verification supported by a series of orthogonal experiment results to demonstrate the effectiveness and the feedback loop between raw materials and properties of polymer mortars, which had revealed a big practical value and convenience for rapid construction in the job sites, especially for researchers and engineers in the field. Its effort to avoid, or at least control the damage of polymer powders to compressive strength of cement mortars. The mix proportion of high-performance polymer mortars (HPMs) was determined as follows, considering the working and mechanical properties: DWR was 0.85 g, DC was 1.05 g, DF was 1.15 g, CC was 42%, DEA was 10 g, and DREP was 20 g. Successfully created HPMs with pumping resistance of just 61.6N, compressive strength of 68.5MPa at 28d.

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Section: The Effect Of Interaction On the Working Performance Of Poly...mentioning

confidence: 99%

Design and preparation of high-performance polymer mortars based on performance prediction model

Wang

et al. 2022

Mater. Res. Express

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“…In contrast, the addition of hydrophobic organic components seems more efficient as the pore interfaces inside the cement-based materials could be easily modified by small amounts of organic components, including silanes [ 13 , 14 , 15 ], polymers [ 16 , 17 , 18 , 19 ], long-chain fatty acid/salts [ 20 , 21 , 22 ] and so on. However, as these water-insoluble components are inclined to float and aggregate on the surface of cement slurry during the mixing, a heterogeneous matrix with uneven hydrophobic and mechanical properties will be formed [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of an Amphiphilic Micelle of Diblock Copolymer on Water Adsorption of Cement Paste

et al. 2023

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To reduce the inhibiting effects of polystyrene-based emulsion on the hydration process and strength development of cementitious materials, an amphiphilic diblock copolymer polystyrene-block-poly(acrylic acid) (PS-b-PAA) was synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization and demonstrated in cement paste system for improving the resistance to water absorption without significantly reducing 28-day compressive strength. Firstly, the dissolved PS-b-PAA was added into water, and it quickly self-assembled into amphiphilic 80 nm-sized micelles with hydrophobic polystyrene-based core and hydrophilic poly(acrylic acid)-based shell. The improved dispersion compared to that of polystyrene emulsion may minimize the inhibiting effects on strength development, as the effects of PS-b-PAA micelle as hydrophobic admixtures on rheological properties, compressive strength, water absorption, hydration process, and pore structure of 28-day cement pastes were subsequently investigated. In comparison with the control sample, the saturated water absorption amount of cement pastes with 0.4% PS-b-PAA was reduced by 20%, and the 28-day compressive strength was merely reduced by 2.5%. Besides, the significantly increased hydrophobicity instead of slightly decreased porosity of cement paste with PS-b-PAA may contribute more to the reduced water adsorption characteristics. The study based on prepared PS-b-PAA micelle suggested a promising alternative strategy for fabricating polystyrene-modified concrete with reduced water absorption and unaffected compressive strength.

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Surface relaxation and permeability of cement pastes with hydrophobic agent: Combining 1H NMR and BET

Zhang

Zhao

et al. 2021

Construction and Building Materials

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The impact of carboxylic acid type hydrophobic agent on compressive strength of cementitious materials

Cited by 12 publications

References 14 publications

Design and preparation of high-performance polymer mortars based on performance prediction model

Design and preparation of high-performance polymer mortars based on performance prediction model

Effects of an Amphiphilic Micelle of Diblock Copolymer on Water Adsorption of Cement Paste

Surface relaxation and permeability of cement pastes with hydrophobic agent: Combining 1H NMR and BET

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