基于富勒及泰波理论的机制砂颗粒级配研究

为适应我国干混砂浆标准,依据富勒公式和泰波理论对于n值的取值范围,绘制了符合我国套筛筛孔尺寸的富勒曲线,按照其机制砂级配取值范围进行水泥砂浆试验,结果表明,当n≥0.45时,砂浆泌水率高,抗压强度低,流动性差,批刮费力,收缩率高,将不合适的n值剔除后得到缩小范围的富勒曲线,并据此用不同比例的机制砂中砂和细砂配制砂浆,标出其在干混砂浆富勒曲线中的位置,测试结果表明多数处于曲线范围之内的砂浆抗压强度高,泌水率低,施工省力,不黏抹刀,收缩率低,处于级配范围之外的砂浆性能较差。结论认为,符合富勒曲线且线形平顺圆滑的机制砂颗粒级配良好。

Study on grain com position ofm anufactured sand on basis of Fullerand Tabortheory

To meet our standards of dry-mixed mortar,Fuller Curve drawn in line with our mesh size and initially identified the scope of composition.Its foundation was n value range of Fuller formula and Teppo theory.The mortar were prepared with manufactured sand according to Fuller Curve.When n≥0.45,the bleeding rate of mortar was high,mobility was bad,the scraping was laborious,the shrinkage rate was high.The Fuller curve of dry-mixed mortar was get excluding inappropriate n value.This narrowed the composition scope of Fuller curve.The mortar was prepared with different proportions sand and fine sand,and its position was marked in the Fuller curve of dry-mixed mortar.The test results showed that the compressive strength of mortar's curve within the composition scope was high,the bleeding rate was low,the scraping was saving,the shrinkage rate was low,and its non-stick spatula.The mortar's performance was slightly worse when its curve section within the composition scope,and it was worse when outside the scope.It concluded fromabove that the grain composition of dry-mixed mortar was good when its curve met the Fuller curve of dry-mixed mortar and its linear was smooth.