硅烷复合乳液对水泥砂浆干燥收缩性能及力学性能的影响

doi:10.11896/cldb.20070281

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Abstract Graphene oxide/isobutyltriethoxysilane composite emulsion (GO/IBTS composite emulsion) and tetraethoxysilane/isobutyltriethoxysilane composite emulsion (TEOS/IBTS composite emulsion) are two new silane composite emulsion. The effects of the addition of two silane composite emulsions on the properties of cementitious mortar formulations with different dosage were studied. Drying shrinkage and water loss of hardening mortars during dry curing conditions and the mechanical properties of hardened mortars were measured in order to investigate the impact of silane composite emulsion on the properties of mortars. It was found that GO/IBTS composite emulsion could effectively inhibit the drying shrinkage and water loss of mortars. The drying shrinkage and water loss of mortars reached the minimum when the GO/IBTS composite emulsion content was 2%, and the mechanical strength reaches the highest average. TEOS/IBTS composite emulsion has no obvious inhibitory effect on mortar drying shrinkage and water loss. However, when the content is 2%, the mechanical properties reach the maximum, and the compressive strength and flexural strength increase by 5% and 17% respectively. The content of two silane composite emulsions should not exceed 3% of cement quality. SEM and EDS tests showed that GO/IBTS composite emulsion formed a dispersed and uniform flocculent structure inside the mortar. In addition, the infrared spectroscopy test results also showed that the silane composite emulsion has been combined with the mortar through chemical bonding.

Key words： silane composite emulsion cement mortar drying shrinkage water loss mechanical property

Published: 25 November 2021 Online: 2021-12-13

CLC number:

TU528

Fund:National Natural Science Foundation of China (51778308, 51978355), Open Foundation of Jiangsu Key Laboratory of Civil Engineering Materials (CM2016-04, CM2016-06) and Open Foundation of Cooperative Innovation Center of Engineering Construction and Safety in Shandong Blue Economic Zone.

About author: Shilin Xu, master candidate, Qingdao University of Technology, mainly engaged in the research on the influence of composite silane materials on the crack resistance of concrete.
Shaochun Li, professor of the School of Civil Enginee-ring, Qingdao University of Technology, received his Ph.D. in Materials Science and Engineering from Zhejiang University in 2008. Outstanding youth innovation team leader of Shandong province, high-level talents of Xinjiang Uygur Autonomous Region, director of Sol-gel Branch of China Silicate Society, director of Shandong Architectural Society. He has published more than 60 academic papers, including 39 SCI and EI patents, 9 national invention patents and 3 PCT patents. He has won the second prize of Science and Technology Progress of the Ministry of Education. At present, he is mainly engaged in the research on the preparation and durability of high-performance concrete in marine environment. His research direction is concrete surface protection technology and concrete structure durability evaluation system in marine environment.

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Cite this article:

XU Shilin,LI Shaochun,GENG Yongjuan, et al. Influence of Silane Composite Emulsion on Drying Shrinkage and Mechanical Properties of Cement Mortar[J]. Materials Reports, 2021, 35(22): 22045-22050.

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http://www.mater-rep.com/EN/10.11896/cldb.20070281 OR http://www.mater-rep.com/EN/Y2021/V35/I22/22045

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