| POLYMERS AND POLYMER MATRIX COMPOSITES |
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| The Composition Effect and Mechanism of Polycarboxylate Superplasticizers and Early Strength Agent |
| DU Rongrong1,2, ZHANG Xiong1,2, GU Mingdong2, JI Tao2
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1 Key Laboratory of Advanced Civil Engineering Material, Ministry of Education, Tongji University, Shanghai 201804;
2 School of Materials Science & Engineering, Tongji University, Shanghai 201804 |
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Abstract The composition mechanism of polycarboxylate superplasticizers and early strength agent is not well studied, especially the hydration process. In this study, the organic and inorganic early strength agents were compounded, followed by the measurement of the cement paste fluidity, cement mortar strength and viscosity. The test of cement hydration heat, XRD, TG-DTA were used to demonstrate the hydration process. According to the research, the introduce of inorganic early strength agent such as sodium thiosulfate and calcium chloride could destroy the steric hindrance effect, leading to the significant decrease of the water-reducing rate of polycarboxylate superplasticizers. However, calcium formate, sodium thiocyanate and triethanolamine showed almost no effect on water-reducing rate. According to the test result of hydration heat of cement during 24 h, the hydration degree of cement paste can be improved during the hydration acceleration by adding early strength agent. As shown in the XRD and TG-DTA analysis, early strength agent could increase the formation of AFt, calcium hydroxide and C-S-H gel in 3 d hydration, but showed little effect on the 28 d hydration.
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Published: 19 June 2019
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51378391). |
| About author:: Rongrong Dureceived her bachelor’s degree in June 2016 from Tongji University in engineering. From September 2016 to June 2019, she studied in School of Materials Science and Engineering, Tongji University, focusing on the research of building functional materials and permeable pavement materials.Xiong Zhang,second-level professor and doctoral supervisor of Tongji University, director of Building Materials Research Institute of Tongji University, is mainly engaged in the research of building functional materials and new building materials. |
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2019, Vol. 33 
