【摘要】 采用Ⅱ类原状机制砂配制强度等级为C30～C60混凝土时,亚甲蓝试验合格时的石粉含量要求小于5%,这限制了原状机制砂在工程中的应用。研究石粉含量为3%～16%的原状机制砂配制强度等级C30的混凝土,分析石粉含量对混凝土拌和物工作性能和基本力学性能的影响规律,提出了原状机制砂石粉含量由5%放宽到16%是可行的。更多还原

【Abstract】 When the second class proto-machine-made sand is used for making up C30 to C60 concrete and the methylene blue test is used as the quality inspection,the stone powder content should no more than 5% according to current specification.For experimental study,the C30 concrete was made up with proto-machine-made sand in which the stone powder content is 3% to 16%.The influences of stone powder content on concrete workability and the basic mechanical properties were analyzed,the reasonable range of stone powder content in the proto-machine-made sand was proposed.更多还原