Preparation and performance research of cement-based grouting materials with high early strength and expansion |
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Authors: | Yi Zhang Wei Li Dongxu Li |
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Affiliation: | 1.Key Laboratory of Metallurgical Emission Reduction & Resources Recycling, Ministry of Education, College of Material Science and Engineering,Anhui University of Technology,Maanshan,China;2.AIRT New Materials Co. Ltd,Nanjing,China;3.College of Material Science and Engineering,Nanjing Tech University,Nanjing,China |
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Abstract: | Main performance of the cement grouting materials made up by Portland cement(PC) and sulphoaluminate cement(SAC) was investigated in this program, a kind of expanding agent(EA) which was mainly constituted by metakaolin and alunite was utilized for the compensation of the shrinkage, the hydration products and micro structure of the grouting materials were researched by X-ray diffraction(XRD) and scanning electron microscopy (SEM). The results showed that a high expansion rate of the grouting materials could be reached as the expanding agent mixed in 6% of PC mass; the addition of SAC in the S2(PC:SAC:EA=34:6:2.25) brought a further improvement of the expansion rate of the grouting materials, the analysis of XRD and SEM showed that due to the reaction of expanding agent and SAC in the grouting materials, more ettringite crystal was generated, which resulted in a higher early strength, the addition of SAC played an expansion and strength reinforcement role in the grouting materials. |
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