This research focuses on investigating the effect of quartz particle size and cement replacement on their physicomechnical properties.Portland limestone cement(PLC)was employed and replaced with quartz powder(QP)at va...This research focuses on investigating the effect of quartz particle size and cement replacement on their physicomechnical properties.Portland limestone cement(PLC)was employed and replaced with quartz powder(QP)at various particle sizes(1.19 mm,425μm,300μm,212μm,<212μm)and cement replacement between 2.5 wt.%~15 wt.%at interval of 2.5 wt.%to study their impact on the cement properties.The PLC chemical composition revealed a relatively low lime and high silica content compared to the conventional cement.QP revealed a high silica,lime and sulphur contents compared to natural sand.A high consistence,elongated setting times and lower strengths and specific gravities were observed as cement was replaced with QP at a given particle size respectively.The effect of replacing cement with QP content between 2.5 wt.%and 15 wt.%at various particle sizes resulted in average increments by 45.32%,23.13%and 36.06%for initial setting time,final setting time and water demand respectively.This increase could be related with clinker diminution coupled with enhanced QP surface area and clinker diminution.Similarly,an increase in the QP surface area at a given cement replacement led to higher water consistence,retarded setting times and lower strength.The effect of enhancing the QP’surface area between 1.19 mm and below 212μm at a given cement replacement resulted in average increments by 26.27%,8.61%and 7.49%for initial and final setting times and water demand respectively.The strength gain of the QP cement blend diminished significantly above 30%up to 15 wt.%cement replacement especially beyond 3 days.The low strength could be due to the high-water consistence linked with silica content resulting in setting time retardation.The optimal QP content was determined at 5 wt.%owing to the fact that the physicomechnical properties did not significantly deviate from the properties of control.展开更多
文摘This research focuses on investigating the effect of quartz particle size and cement replacement on their physicomechnical properties.Portland limestone cement(PLC)was employed and replaced with quartz powder(QP)at various particle sizes(1.19 mm,425μm,300μm,212μm,<212μm)and cement replacement between 2.5 wt.%~15 wt.%at interval of 2.5 wt.%to study their impact on the cement properties.The PLC chemical composition revealed a relatively low lime and high silica content compared to the conventional cement.QP revealed a high silica,lime and sulphur contents compared to natural sand.A high consistence,elongated setting times and lower strengths and specific gravities were observed as cement was replaced with QP at a given particle size respectively.The effect of replacing cement with QP content between 2.5 wt.%and 15 wt.%at various particle sizes resulted in average increments by 45.32%,23.13%and 36.06%for initial setting time,final setting time and water demand respectively.This increase could be related with clinker diminution coupled with enhanced QP surface area and clinker diminution.Similarly,an increase in the QP surface area at a given cement replacement led to higher water consistence,retarded setting times and lower strength.The effect of enhancing the QP’surface area between 1.19 mm and below 212μm at a given cement replacement resulted in average increments by 26.27%,8.61%and 7.49%for initial and final setting times and water demand respectively.The strength gain of the QP cement blend diminished significantly above 30%up to 15 wt.%cement replacement especially beyond 3 days.The low strength could be due to the high-water consistence linked with silica content resulting in setting time retardation.The optimal QP content was determined at 5 wt.%owing to the fact that the physicomechnical properties did not significantly deviate from the properties of control.
