Influence of Polycarboxylate Superplasticizer on the Properties of Cement-Fly Ash Cementitious Materials and Concrete

Jianguo Chen, Yuling Zhu, Weilian Du, Mengxiang Li, Yifan Wang, Chunling Zhang, Mingsheng Shi and Binghan Xue ()
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Jianguo Chen: Yellow River Laboratory, Zhengzhou University, Zhengzhou 450001, China
Yuling Zhu: College of Mechanics and Materials, Hohai University, Nanjing 211106, China
Weilian Du: College of Mechanics and Materials, Hohai University, Nanjing 211106, China
Mengxiang Li: College of Mechanics and Materials, Hohai University, Nanjing 211106, China
Yifan Wang: College of Mechanics and Materials, Hohai University, Nanjing 211106, China
Chunling Zhang: College of Mechanics and Materials, Hohai University, Nanjing 211106, China
Mingsheng Shi: Yellow River Laboratory, Zhengzhou University, Zhengzhou 450001, China
Binghan Xue: Yellow River Laboratory, Zhengzhou University, Zhengzhou 450001, China

Sustainability, 2022, vol. 14, issue 20, 1-13

Abstract: Concrete materials often crack due to the temperature field caused by the early heat of hydration, affecting structural safety and normal use. To solve this problem, this paper proposes the method of incorporating polycarboxylate superplasticizer to improve its performance and explore the influence of polycarboxylate superplasticizer on the properties of cement-fly ash composite cementitious materials and concrete. Ordinary silicate was used to prepare cement-fly ash composite cementitious materials. Through isothermal conduction calorimetry, X-ray diffraction (XRD), scanning electron microscopy (SEM), and other testing methods, the influence of polycarboxylate water-reducing agent on the heat of hydration of cementitious materials was studied. In addition, the hydration products and microscopic morphology of the cementitious materials were analyzed, and the changes in the concrete properties due to the addition of polycarboxylate superplasticizers were discussed. The results showed that the polycarboxylate superplasticizer could delay the onset time of the hydration heat peak of the slurry and reduce the hydration heat peak, inhibit the crystallization of Ca(OH) 2 and AFt, improve the density of the slurry, and reduce the amount of chemically bound water. In addition, it could delay the overall hydration process of the cementitious material, where the adiabatic temperature increase rate and the early drying shrinkage rate of the concrete slowed down, and the mechanical properties and impermeability of the concrete improved.

Keywords: adiabatic temperature increase; cementitious material; concrete; fly ash; hydration reaction; polycarboxylate superplasticizer (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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