摘要
机制砂的流动度比和胶砂强度是系统反映机制砂性能的关键指标,为揭示机制砂特性与机制砂流动比和胶砂强度之间的关系,本研究通过调整机制砂级配、石粉含量和添加泥粉的方式,系统研究了机制砂级配、石粉含量以及MB值对机制砂流动度比和胶砂强度的影响。结果表明,随着机制砂的级配改变、堆积空隙率增大,其流动度比随之降低,胶砂抗压强度呈现为线性递减趋势,表明通过调整级配适当降低机制砂堆积空隙率对胶砂流动度和抗压强度有利;随着石粉含量增加,流动度比线性下降,而抗压强度则线性增长,说明石粉存在最佳含量;随着MB值增大,流动度比显著减小,抗压强度则呈现为先增大而后降低的趋势,不过其并不会对抗压强度产生负面影响。
The fluidity ratio and mortar strength of manufactured sand are the key indicators reflecting the performance of manufactured sand.In order to reveal the relationship between manufactured sand characteristics and the fluidity ratio and mortar strength of manufactured sand,This study systematically studied the influence of the manufactured sand gradation,the content of stone powder and the MB value on the fluidity ratio of manufactured sand and the mortar strength by adjusting the manufactured sand gradation,the content of stone powder and adding mud powder.The results show that as the manufactured sand gradation changes and the volumetric porosity increases,its fluidity ratio decreases accordingly,the compressive strength of mortar show a linear decreasing trend,which indicates that reducing the volumetric porosity of manufactured sand by adjusting gradation is beneficial to the fluidity and compressive strength of mortar;as the content of stone powder increases,the fluidity ratio shows a linear downward trend,while the compressive strength increases linearly,indicating that there is an optimal content of stone powder;with the MB value Increase the fluidity ratio decreases significantly,and the compressive strength will first increase and then decrease,but it will not have a negative impact on the compressive strength.
作者
王鹏
陈晋栋
祝雯
蔡劲泽
雷家辉
WANG Peng;CHEN Jin-dong;ZHU Wen;CAI Jin-ze;LEI Jia-hui(Guangzhou Metro Group Co.,Ltd.,Guangzhou 510330;Guangzhou Institute of Building Science Group Co.,Ltd.,Guangzhou 510440)
出处
《广州建筑》
2021年第4期34-38,共5页
GUANGZHOU ARCHITECTURE
基金
广东省住房和城乡建设厅2020年科技计划项目(2020-K25-551390)。
关键词
级配
石粉含量
MB值
流动度比
胶砂强度
gradation
stone powder content
MB value
fluidity ratio
mortar strength
