Polycarboxylate superplasticizer modified by phosphate ester in side chain and its basic properties in gypsum plaster

Qi, Huahui; Ma, Baoguo; Tan, Hongbo; Su, Ying; Jin, Zihao; Li, Chunbao; Liu, Xiaohai; Yang, Qi; Luo, Zhenmin

doi:10.1016/j.conbuildmat.2020.121566

Cited by 32 publications

(8 citation statements)

References 57 publications

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“…The CO 2 concentration was 99.9% and the inside pressure was 0.3 MPa. After carbonating for 2 hours and 24 hours, the specimens were dried to a constant mass, and then their compressive strength was tested according to i obliczany zgodnie ze wzorem [2][3].…”

Section: Test Methodsmentioning

confidence: 99%

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Mechanical performance and water resistance of a carbonated hemihydrate gypsum and slaked lime composite

Tian,

Wang,

Zhang

et al. 2024

Cement Wapno Beton

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In order to improve the strength and water resistance of hemihydrate gypsum, slaked lime was incorporated and a carbon dioxide curing technique was used. First, hemihydrate gypsum, slaked lime, and water were mixed at different proportions. The mixture was pressed into block samples by a compression machine at a pressure of 3 MPa and placed a curing kettle full of CO2 at a pressure of 0.3 MPa. The results of mechanical performance tests show that when the ratio of gypsum to lime is 7 to 3 and the water to solid ratio is 0.2, the compressive strength of the sample cured under CO2 can reach 29.1 MPa and the softening coefficient is 1.05. The results of microscopic characterization show that the main constituents are dihydrate gypsum and calcium carbonate. These observations will provide guidance to the application of carbonated hemihydrate gypsum and slaked lime composite.

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Section: Test Methodsmentioning

confidence: 99%

“…Gypsum-based building materials have many advantages, such as light weight, low expansion, good fire resistance and low cost (1)(2)(3).…”

Section: Introductionmentioning

confidence: 99%

Mechanical performance and water resistance of a carbonated hemihydrate gypsum and slaked lime composite

Tian,

Wang,

Zhang

et al. 2024

Cement Wapno Beton

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“…To date, several groups have reported the synthesis of copolymers containing phosphate groups and the performance characterization of the inorganic mineral phase. 8,13,14 Plank and coworkers 8 synthesized the copolymers of 2-hydroxyethyl methacrylate phosphate (HEMAP) and polyethylene glycol methacrylate ester and compared these phosphate polymers with polycarboxylate superplasticizers. Their results showed that the phosphate polymers have superior dispersing performance and exhibit comparable sulfate and clay tolerance as the conventional polycarboxylate superplasticizer.…”

Section: Introductionmentioning

confidence: 99%

The synthesis and adsorption–dispersion properties of PPEGMA–PVPA copolymers in cement paste

Li,

Zhou,

Shu

et al. 2024

RSC Adv.

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“…PCs are formed by the main chain with carboxylate groups and the polyethylene oxide segment side chain, exhibiting excellent water-reducing properties and a high compatibility and processability in cement-based material; nowadays PCs are accepted as the most efficient dispersant [ 15 , 16 , 17 ]. Similarly, they have shown excellent ability in dispersing the gypsum system in practice, and the water reduction mechanism of PCs can also be applied to gypsum [ 18 , 19 , 20 , 21 , 22 ]. When β-HH is hydrated, the surface of gypsum particles is positive due to the positive electricity of calcium ions.…”

Section: Introductionmentioning

confidence: 99%

“…At present, studies on the water reducers in gypsum are fewer than that in cements [ 18 , 19 , 20 , 21 , 22 ]. In particular, the relationship between the structure of PCs and their property in gypsum need detailed investigation because the efficiency of PCs is obviously dependent on their molecular structure [ 23 ].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Triblock Polycarboxylate Superplasticizers with Well-Defined Structure and Its Dispersing Performance in β-Hemihydrate Gypsum

Guo¹,

Gao²,

Jiang³

et al. 2023

Molecules

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In this work, a novel AaBAb−type triblock polycarboxylate superplasticizers (PCEs) with well defined molecular structures were designed and synthesized, firstly, by reversible addition−fragmentation chain transfer (RAFT) polymerization, to explore the structure–property relationship PCEs in the β−hemihydrate gypsum (β−HH) system. Three PCEs with the same molecular weight and different structure were obtained by changing the feed ratio of the RAFT agent, initiator, and monomer. The effect of the chemical structure of PCEs on their dispersing property and water reduction capacity were assessed in gypsum by measuring the flowability of pastes and the adsorption ability of PCEs on gypsum. Results showed that among three PCEs, when the monomer ratio is 5:1 and a:b = 1:1, PCE−1 exhibited a higher working efficiency, verifying the contribution of regulating structural parameters to the improvement in performances of gypsum paste, because PCE−1 showed the strongest binding capacity with calcium ions due to the relatively equal amount of carboxyl groups at both ends. The AaBAb−type PCEs provide a special advantage over the conventional comb polymer to understand the relation between the structure and property of PCEs, and a direction for further development of PCEs of high performance.

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Polycarboxylate superplasticizer modified by phosphate ester in side chain and its basic properties in gypsum plaster

Cited by 32 publications

References 57 publications

Mechanical performance and water resistance of a carbonated hemihydrate gypsum and slaked lime composite

Mechanical performance and water resistance of a carbonated hemihydrate gypsum and slaked lime composite

The synthesis and adsorption–dispersion properties of PPEGMA–PVPA copolymers in cement paste

Synthesis of Triblock Polycarboxylate Superplasticizers with Well-Defined Structure and Its Dispersing Performance in β-Hemihydrate Gypsum

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