Experimental Study on Aerated Characteristics of Hydraulic Concrete under Different Test Conditions
In order to study the influence of different test conditions on the air content of hydraulic concrete mixture,the influence of test conditions on the air content of normal concrete with slump of 50～70 mm and pumped concrete with slump of 140～160 mm is analyzed from three aspects of ambient temperature,compaction time and single mixing volume.The results show that the air content of concrete decreases with the ambient temperature.When the ambient temperature rises from 10℃to 35℃,the air content of normal concrete de-creases by 41.2%,and the air content of pumped concrete decreases by30.9%.The gas content loss rate increases with the increase of ambient temperature.When the ambient temperature exceeds 25℃,the gas content loss over time is more obvious.With the extension of concrete compaction time,the air content shows a downward trend.When the compaction time is extended from 5 s to 30 s,the air con-tent of normal concrete decreases by33.3%,and the air content of pumped concrete decreases by56.1%.The air content of concrete in-creases with the increase of single mixing volume.When the single mixing volume of concrete increases from 20%of the mixer capacity to 80%,the air content of normal concrete increases by 32.5%and the air content of pumped concrete increased by 34.9%.The study re-sult can provide a reference for on-site construction and indoor concrete air content control.
air content of concreteambient temperaturecompaction timesingle mixing volume
万方数据
维普
