Materials Reports  2021, Vol. 35 Issue (Z1): 211-215 |
| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Study on Properties of Different Lithology Stone Powder-Cement Composite Cementitious Materials |
| SUN Ruru1,2, WANG Zhen1,2, HUANG Fali1,2, YI Zhonglai1,2, YUAN Zhengcheng1,2, XIE Yongjiang1,2, LI Huajian1,2
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1 Railway Engineering Research Institute, China Academy of Railway Sciences Corporation limited, Beijing 100081, China
2 State Key Laboratory for Track Technology of High-Speed Railway, Beijing 100081, China |
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Abstract In order to explore the feasibility of limestone, granite, quartzite and tuff powder as mineral admixture for concrete, the mineral composition, Zeta potential and superplasticizer adsorption rate of stone powder with different lithology were measured by the X-ray diffractometer, Zeta potential analyzer and total organic carbon analyzer. The workability and mechanical properties of the paste and mortar of stone powder-cement binary composite cementitious materials and stone powder-fly ash/slag powder-cement ternary composite cementitious materials were studied. The results show that the mineral composition of stone powder has great influence on Zeta potential and superplasticizer adsorption rate. Zeta potential and superplasticizer adsorption rate of tuff powder change obviously with the increase of time due to the loose structure of zeolite minerals. The intercalation adsorption of mica minerals makes the obvious superplasticizer adsorption of granite powder. The effect of different lithology stone powder on the workability of composite cementitious material paste is closely related to the superplasticizer adsorption of stone powder. The compressive strength ratio and bending strength ratio of different lithology stone powder-cement composite cementitious materials are all higher than 60%, and the stone powder increases the flexural pressure ratio of cement mortar and improves the toughness of the mortar specimen.
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Published: 16 July 2021
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| Fund:National Natural Science Foundation of China (U1934206), the Research and Development Programs for Science and Technology of China Railways Corporation (P2019G001) and the National Key Research and Development Program of China (2018YFC0705401). |
| About author:: Ruru Sun received her M.S. degrees in June 2020 from China Academy of Railway Sciences in engineering. Her research is focusing on the new civil engineering mate-rials and durability of railway concrete structure.Huajian Li, a doctor graduated from Tsinghua University, served in China Academy of Railway Sciences as the researcher and Master's tutor. He has presided over 4 National Natural Science Foundation Projects, 1 branch project of National Key Research and Development Plan and 12 provincial and ministerial scientific research projects. The achievements have won 1 second prize of the National Science and Technology Progress Award, 1 second prize of the National Technological Invention Award, 2 Chinese patent Excellence Awards, 2 provincial and ministerial special prizes, 6 provincial and ministerial first prizes and 6 provincial and ministerial second prizes. He has obtained 26 national invention patents and 3 software copyrights. He has published 3 monographs, 22 SCI/EI papers, and 16 industry standards. His major research interests are durability of high-speed railway concrete structure, new civil engineering materials, repairment and protection of high-speed railway structural engineering. |
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