Properties of Cement Mortar with Flake Particle in Manufactured Sand
YU Bentian1,2,3,*, LIU Tong1, WANG Huan2, LI Sheng1, XIE Chao1, SU Lei4, LI Yanlin4
1 School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China 2 China Railway 14th Bureau Group Co., Ltd., Jinan 250014, China 3 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China 4 Tiezheng Testing Technology Co., Ltd., Jinan 250014, China
Abstract: Obtaining the different size flake particles from manufactured sand using bar-shaped sieve method, under the condition that the gradation of manufactured sand remained unchanged, the fluidity, flexural strength, compressive strength and pore structure characteristics of cement mortars were tested when the content of the combined particle size of the flake particles in the manufactured sand is 10%, 20%, and 30%, and the content of single flake particle size is 10% with the particle size of 1.18—2.36 mm, 2.36—4.75 mm, and 4.75—9.50 mm respectively. The experimental results show that with the increase of the particle size of the flake particles, the porosity of the manufactured sand increases, the porosity of the prepared cement mortar increases, and the number of harmful pores increases, which results in fluidity, flexural and compressive strength of cement mortar reduce obviously, when the content of flake particles in manufactured sand is increased or the content of flake particles is 10%. Grey correlation analysis shows that the content of flake particles is the most critical factor affecting cement mortar, and the single particle size of 4.75—9.50 mm is the second factor affecting cement mortar. In order to ensure the performance of cement sand, the total content of flake particles in the manufactured sand and the content of 4.75—9.50 mm flake particles should be strictly controlled.
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2021, Vol. 35 
