Effect of Stone Powder Substitution Rate on the Performance and Microstructure of Mechanism Sand Polymer-bonded Mortar
TIAN Haozheng1,2, QIAO Hongxia1,2,3,*, FENG Qiong1,2,*, HAN Wenwen1,2
1 School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China 2 Gansu Advanced Civil Engineering Materials Engineering Research Center, Lanzhou University of Technology, Lanzhou 730050, China 3 Western Ministry of Civil Engineering Disaster Prevention and Mitigation Engineering Research Center, Lanzhou University of Technology, Lanzhou 730050, China
Abstract: In order to study the feasibility of the application of tuff stone powder in polymer-bonded mortar, the influence of stone powder substitution rate on the working performance and mechanical properties of polymer-bonded mortar was analyzed. The mercury intrusion porosimetry (MIP), scanning electron microscopy (SEM) and fourier transform infrared spectroscopy (FTIR) were used to study the internal pore structure of mortar and the microstructure of hydration products. The results show that: tuff stone powder has good applicability in polymer-bonded mortar; the strength of mortar increases first and then decreases with the increase of stone powder substitution rate, and the flexural strength, compressive strength and bond strength reach the maximum at 7 d and 28 d when the stone powder substitution rate is 15%, and the working performance is also better at this time; when the substitution rate is not more than 15%, its effect on the microstructure of mortar is mainly filling effect and nuc-leation effect, which can effectively improve the internal compactness of mortar, and is conducive to the development of internal pore structure to less harmful pores and harmless pores; when the substitution rate is 15%, the characteristic vibration peak intensity of H2O, OH-, CO32-, etc. is the highest, i.e. the internal hydration is the most adequate at this time; when the substitution rate of stone powder exceeds 15%, stone powder has adverse effects on the working performance, mechanical properties and microstructure of bonded mortar.
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2024, Vol. 38 
