Experimental Study and Microstructure Analysis of Calcareous SandCement Mortar
LI Wenjie1, CHEN Yihu2, FAN Liyun2, LYU Haibo1,2
1 College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004, China; 2 Architectural and Civil Engineering Institute, Hezhou University, Hezhou 542899, China
Abstract: In order to explore the engineering properties of calcareous sand, a new building material, the mechanical properties of calcareous sand cement mortar were tested and the influences of water-cement ratio, curing conditions, curing age and size were studied by the compressive and flexu-ral strength,the microstructure of calcareous sand particles and cement mortar were analyzed by SEM, and the relationship between the fineness modulus of calcareous sand and water absorption was established. The results show that: the early strength of calcareous sand cement mortar is slightly higher than that of standard sand, but the strength is not as good as that of standard sand mortar at 28 d;The strength of cement mortar in seawater conservation is higher in the early stage of curing but significantly weaker in the later stage of curing than that in freshwater conservation. SEM revealed that, after the process of cement hydration, surface pores of the GS1 particles are well cemented by the hydration products such as: C-S-H, Ca(OH)2 and C-A-H, and the GS3 particles can have better bite force between the particles,however, GS2 does not have these advantages so that its compressive strength is less than the cement mortar of GS1 and GS3. The water absorption of calcareous sand is about 5%—6% higher than that of standard sand, the strength increases as the water absorption rate decreases; The water absorption and the fineness modulus of calcareous sand are in quadratic polynomial relations, the compressive strength calculation of calcareous sand cement mortar was corrected in consideration of the water absorption.
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2020, Vol. 34 
