Journal of South China University of Technology(Natural Science) >

2023 , Vol. 51 >Issue 1: 76 - 83

DOI: https://doi.org/10.12141/j.issn.1000-565X.220176

Materials Science & Technology

Structure of C-S-H/PCE Prepared from PCE with Different Side Chain Densities and Its Effects on Early Hydration Properties of Cement

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  • School of Materials Science and Engineering，South China University of Technology，Guangzhou 510640，Guangdong，China
殷素红（1971-），女，博士，教授，主要从事水泥混凝土材料、绿色低碳建筑材料、碱激发胶凝材料、固体废弃物建材资源化利用等的研究。

Received date: 2022-04-06

  Online published: 2022-05-05

Supported by

the Science and Technology Planning Project of Guangdong Province(2017B020238004)

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Abstract

The development of prefabricated buildings increases the demand for using early strong agents in the production of prefabrication. As a new type of crystal early strength agent, synthetic calcium silicate hydrate (C-S-H) can significantly enhance the early strength of cement-based materials, but its poor dispersibility limits its application. In this paper, the polycarboxylate superplasticizers (PCE) with different side chain density were used as a dispersant to synthesis a series of C-S-H/PCE by means of co-precipitation method. The influence of C-S-H/PCE on the structure of C-S-H was studied with XRD, FT-IR, DLC. Moreover, its influence on the cement hydration behavior, hardened body strength and composition structure was investigated. The results show that the smaller the side chain density of PCE, the better the dispersion of C-S-H seeds and the smaller the particle size; the median particle size can reach 339.5 nm; the increase of the number of seed particles can provide more nucleation sites. The incorporation of C-S-H/PCE can significantly accelerate cement hydration, advance the exothermic peak of hydration acceleration by 1.3 h, and increase the heat release by 10.8% at 8 h. After the incorporation of C-S-H/PCE, the porosity of the hardenite of the cement slurry decreases at 8 h and 1 d and the compressive strength increases by 13% and 15%, respectively.

Key words： synthetic calcium silicate hydrate; polycarboxylate superplasticizer; side chain density; cement; early hydration

Cite this article

YIN Suhong, YANG Xinglin, FENG Xian, et al . Structure of C-S-H/PCE Prepared from PCE with Different Side Chain Densities and Its Effects on Early Hydration Properties of Cement[J]. Journal of South China University of Technology(Natural Science), 2023 , 51(1) : 76 -83 . DOI: 10.12141/j.issn.1000-565X.220176

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