不同规格机制砂混凝土坍落度及抗压强度研究  

Study on Slump and Compressive Strength of Sand Concrete With Different Specifications

作　　者：李江鸿 Li Jianghong(Bijie Bihai New Area Construction Investment Co.Ltd.,Bijie,Guizhou 551700)

机构地区：[1]毕节市碧海新区建设投资有限责任公司,贵州毕节551700

出　　处：《江西建材》2024年第6期47-49,共3页

摘　　要：文中就不同比表面积砂制备的混凝土拌和料坍落度、混凝土试件强度展开研究。结果表明,所用机制砂比表面积计算方法测试仪器检测砂比表面积时,检测结果与试验测试结果之间差距分别为2.14%和-4.63%;天然河砂长期处于河水冲刷状态下表面光滑,而机制砂经人工破碎处理后会导致表面平整度下降并产生大量针片颗粒,因此,机制砂通常比表面积较高。砂比表面积的增减变化会对混凝土拌和料坍落度影响较大,但不会对混凝土28 d抗压强度产生明显影响。In this paper,the slump of concrete mix prepared by sand with different specific surface area and the strength of concrete specimens were studied.The results show that the difference between the test results and the test results is 2.14%and-4.63%,respectively,when the sand specific surface area calculation method and the test instrument are used.The surface of natural river sand is smooth in the state of river washing for a long time,while the surface roughness of machine-made sand will decrease and a large number of needle particles will be pro-duced after artificial crushing treatment,so the specific surface area of machine-made sand is usually at a high level.The change of sand spe-cific surface area will directly affect the slump of concrete mix,and the increase or decrease of sand specific surface area will not significantly affect the 28 d compressive strength of concrete.

关 键 词：机制砂 混凝土 坍落度 抗压强度 比表面积 

分 类 号：TU528[建筑科学—建筑技术科学]