土木工程学报  2021, Vol. 54 Issue (5): 56-64    
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硫酸钙晶须对机制砂混凝土中石粉#br# 的改性作用研究
刘明辉 王雪艳 刘萱 贾思毅
北京交通大学,北京 100044
Study on modification effect of calcium sulfate whiskers on#br#  stone powder content of manufactured sand concrete
Liu Minghui Wang Xueyan Liu Xuan Jia Siyi
Beijing Jiaotong University, Beijing 100044, China
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摘要 混凝土细集料的主要来源天然砂被过度开采导致资源枯竭和环境破坏,采用机制砂替代天然砂是解决途径之一。石粉是机制砂生产中的副产品,适量的石粉可改善混凝土级配,但石粉含量过高会导致混凝土强度降低、强度离散性增大等问题,因此,《建设用砂》(GB/T 14684)中规定机制砂的石粉含量应不高于10%,但机制砂的石粉含量是实际工程中较难控制的问题。文章研究了硫酸钙晶须(CSW,5kg/m3)对机制砂混凝土中石粉的改性作用:设计了在不同石粉含量(10%、15%、20%)下掺入硫酸钙晶须的机制砂混凝土的力学性能试验,并采用聚丙烯纤维(PPF,1kg/m3)进行了对比,结果表明,未掺入纤维时,10%石粉含量的试件组力学性能高于15%和20%石粉含量的试件组;掺入CSW与PPF后,15%石粉含量的试件组力学性能最优,且CSW的改性作用较PPF明显。在试验基础上,基于可压缩堆积理论,考虑CSW的改性作用,建立了CSW改性高石粉机制砂混凝土强度模型,并进行了模型参数分析。
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刘明辉 王雪艳 刘萱 贾思毅
关键词 机制砂混凝土 石粉 硫酸钙晶须 聚丙烯纤维 力学性能    
Abstract:Natural sand, the main source of concrete fine aggregates, has been over exploited, leading to resource depletion and environmental damage. Using manufactured sand instead of natural sand as concrete fine aggregate is one of the solutions. However, the stone powder content of manufactured sand is difficult to control in actual engineering. A proper amount of stone powder can improve the gradation of concrete, while improper stone powder content will reduce concrete strength and increase strength dispersion. The specification of “Sand for Construction” stipulates that the content of machine-made sand and gravel powder should not be higher than 10%. This paper studies the effect of calcium sulfate whiskers (CSW) on the modification of the stone powder content of manufactured sand concrete: The mechanical property test of manufactured sand concrete mixed with calcium sulfate whiskers (5kg/m3) under different stone powder content (10%, 15%, 20%) was designed. The mechanical property test of the polypropylene fiber (PPF) was carried out as a comparative test. The results showed that the mechanical properties of the specimen group with 10% stone powder without fiber were significantly higher than those with 15% and 20% stone powder. After mixing CSW and PPF, the mechanical properties of the specimen group with 15% stone powder are the best, and the modification effect of CSW is more obvious than that of PPF. Based on the compressible accumulation theory and the modification effect of CSW on high-stone-silt machine-made sand concrete, a model of the strength of CSW-modified high-stone-silt manufactured sand concrete is established, and the model parameters are fitted through the test results.
Key words manufactured sand concrete    stone powder    calcium sulfate whisker    polypropylene fiber    mechanical property
    
引用本文:   
刘明辉 王雪艳 刘萱 贾思毅. 硫酸钙晶须对机制砂混凝土中石粉#br# 的改性作用研究[J]. 土木工程学报, 2021, 54(5): 56-64.
Liu Minghui Wang Xueyan Liu Xuan Jia Siyi. Study on modification effect of calcium sulfate whiskers on#br#  stone powder content of manufactured sand concrete. 土木工程学报, 2021, 54(5): 56-64.
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