5 ℃养护下甲酸钙对水泥早期水化的影响

doi:10.11896/cldb.20020138

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Abstract At 5 ℃ low temperature, the influence law of calcium formate on the mortar strengths at 1 d, 3 d, 7 d and 28 d was studied in this work, and its effect on the early hydration of cement was also analyzed from the perspectives of hydration heat, hydration kinetics and hydration pro-ducts. The results showed that, calcium formate had a low-temperature early-strength effect, which could promote the early strength development of mortar at a low temperature of 5 ℃. And its effect time of strength improvement was mainly before 3 d, and its suitable dosage range was from 1% to 2%. The incorporation of calcium formate could promote the hydration reaction of cement at the initial stage (before 7 d), shorten the hydration induction period of cement slightly, advance the acceleration period, and advance the occurrence time of heat-releasing peak. Furthermore, the hydration heat release rate and cumulative heat release would be all increased significantly. Calcium formate increased all the hydration reaction rates of nucleation and crystal growth (NG)stage, phase boundary reaction (I)stage and diffusion reaction (D)stage, and extended the duration and increased the hydration degree of I stage. The incorporation of calcium formate increased the content of Ca(OH)₂ at the initial stage of cement hydration, but the types of hydration products did not change significantly.

Key words： calcium formate low temperature early strength hydration heat hydration kinetics

Published: 04 June 2021

CLC number:

TQ172

Fund:National Key R&D Program of China (2018YFC0406702), the National Natural Science Foundation of China (51739008), and the Special Fund for Basic Research Business Expenses of Central Public Welfare Research Institute (Y419004).

About author:: Feng Zhang received his Ph. D. degree from Nanjing Hydraulic Research Institute in June 2018. In the same year, he joined the Materials & Structural Engineering Department, and he mainly engaged in hydraulic engineering new materials and concrete durability research.

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	ZHANG Feng
	BAI Yin
	CAI Yuebo

Cite this article:

ZHANG Feng,BAI Yin,CAI Yuebo. Effect of Calcium Formate on Early Hydration of Cement at 5 ℃[J]. Materials Reports, 2021, 35(10): 10055-10061.

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http://www.mater-rep.com/EN/10.11896/cldb.20020138 OR http://www.mater-rep.com/EN/Y2021/V35/I10/10055

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