新型胶凝材料体系的抗裂性能

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Abstract Structural cracking is a common problem that has always plagued modern concrete engineering. There are many factors affecting concrete cracking and the “three highs” of cement, namely high C₃S content, high C₃A content and high fineness is the main reason. In this paper, a new type of low-carbon cementitious material system was formulated by reducing the proportion of cement clinker in cementitious materials, using coarsely ground cement clinker and increasing the proportion of mineral admixtures in cementitious materials. Compared with the cementitious material system commonly used in the current mixing plant, apply the self-developed “square and round anti-crack mold” to study the crack resistance of the two cementitious material systems, and combine the heat of hydration for further analysis. The research shows that the crack resistance of the new type of low-carbon cementitious material system is significantly better than that of the current cementitious material system commonly used in the mixing plant. The heat of hydration heat is lower than that of the commonly used cementing material system in the mixing plant. Adding a certain amount of steel slag and expansion agent can significantly improve the crack resistance of low carbon cementitious mate-rials, and low SO₃ content will increase the cracking sensitivity of low carbon cementitious materials.

Key words： low carbon cementitious material square and round anti-crack mold cracking sensitivity hydration heat sulphur trioxide

Published: 16 July 2021

CLC number:

TU528

Fund:National Natural Science Foundation of China (51578039).

About author:: Shaomin Song, professor and postgraduate supervisor of Beijing University of Civil Engineering and Architecture, head of the Department of Materials of Beijing University of Civil Engineering and Architecture, member of the Science and Technology Education Committee of China Building Materials Federation, vice president and director of the expert committee of China Sand and Stone Association, chairman of the Education and Human Resources Committee of China Concrete and Cement Products Association, chairman of the National Institute of Building Materials Research, China Architectural Society Director of Building Materials Branch, etc. The research fields involve high-quality concrete aggregates, new mineral admixtures, green high-performance concrete theory and practice. Society of China Obtained 11 national invention patents, published more than 100 academic papers, and included more than 20 papers in SCI and EI.Yujie Wang, graduated from Changsha University of Science and Technology with a major in civil enginee-ring in 2012, served in the traffic construction and maintenance engineering unit of the Chinese People's Armed Police Force from 2013 to 2017, worked at the Third Engineering Co., Ltd. of China Communications First Public Bureau from 2017 to 2018, and is now a postgraduate of the College of Civil and Traffic Engineering of Beijing University of Civil Engineering and Architecture, engaged in the research of civil engineering materials. At pre-sent, the main research direction is green high-performance concrete.

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Cite this article:

SONG Shaomin,WANG Yujie,LI Tongbin. Anti-cracking Performance of New Cementitious Material System[J]. Materials Reports, 2021, 35(Z1): 206-210.

URL:

http://www.mater-rep.com/EN/ OR http://www.mater-rep.com/EN/Y2021/V35/IZ1/206