柠檬酸改性低分子量减水剂的合成、性能及机理

doi:10.11896/cldb.22020188

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Abstract Citric acid modified low-molecular-weight superplasticizers (LMWS) was prepared by esterification reaction with citric acid (CA) and methoxy polyethylene polypropylene glycols (MPEPPG) as main raw materials. The superplasticizers were tested by Fourier transform infrared spectrometer (FTIR), ¹H nuclear magnetic resonance (¹H NMR) and gel permeation chromatography (GPC) to obtain structural parameters. Meanwhile, the comprehensive performance of LMWS with the same acid-ether ratio (n(CA)∶n(MPEPPG)=1∶1) and different molecular weight was compared by the dynamic light scattering (DLS), Zeta potential of cement paste, the adsorption performance of superplasticizers on cement, setting time of cement paste, cement hydration heat, plastic viscosity, fluidity of cement paste and concrete performance. The results showed that under the condition of same dosage, LMWS-3 with moderate molecular weight significantly reduces the plastic viscosity of cement paste and delays the hydration process of cement, and also has excellent initial dispersion and dispersion retention performance.

Key words： citric acid esterification low-molecular-weight superplasticizers concrete

Published: 25 January 2024 Online: 2024-01-26

CLC number:

TU528

Fund:Guangxi Science and Technology Program (AB20159011), the Cooperative Research Project of BJUT-NTUT (NTUT-BJUT-110-04), and the Fundamental Research Funds for the Central Universities of Chang’an University(300102311502).

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	Articles by authors
	LU Tong
	QIAN Shanshan
	LIU Xiao
	GAO Ruijun
	ZHENG Chunyang

Cite this article:

LU Tong,QIAN Shanshan,LIU Xiao, et al. Synthesis, Properties and Mechanism of Citric Acid Modified Low-molecular-weight Superplasticizers[J]. Materials Reports, 2024, 38(2): 22020188-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22020188 OR http://www.mater-rep.com/EN/Y2024/V38/I2/22020188

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