Effect of aeolian sand and recycled composite micro-powder on mechanical properties of ultra-high performance concrete

被引：0
|
作者：
Liu C. [1 ,2 ]
Lin X. [1 ]
Liu H. [2 ]
Hu T. [2 ]
机构：
[1] School of Science, Xi'an University of Architecture and Technology, Xi'an
[2] School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an
来源：
Fuhe Cailiao Xuebao/Acta Materiae Compositae Sinica | 2022年 / 39卷 / 11期
关键词：
Aeolian sand; Mechanical property; Microstructure; Recycled composite micro-powder; Ultra-high performance concrete;
D O I：
10.13801/j.cnki.fhclxb.20211119.003
中图分类号：
学科分类号：
摘要：
Ultra-high performance concrete (UHPC) was prepared by partially replacing cement with recycled composite micronized powder. The waste bricks and concrete were used as an auxiliary cementitious material. The river sand was partially replaced with anthracitic sand. The modified Andreasen-Andersen (MAA) particle accumulation model was used to design the proportions. A concrete strength growth prediction model considering the pozzolanic activity of aeolian sands and composite micro-powder was built. The effect mechanism of composite micro-powder and aeolian sand on the mechanical property of UHPC was studied. The results show that the mechanical properties of UHPC are optimal when the replacement rate of river sand by the equivalent mass of aeolian sand is 30wt% and the replacement rate of cement by the equivalent mass of composite micro-powder is 10wt%. The particle size distribution of granular materials is the best, forming a matrix with high compactness. At the same time, the hydration contribution of aeolian sand and composite micro-powder active components improves the microstructure and mechanical properties of UHPC. © 2022, Editorial Office of Acta Materiae Compositae Sinica. All right reserved.
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页码：5415 / 5422
页数：7
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