STUDY ON COMPRESSIVE STRENGTH OF RECYCLED AGGREGATE CONCRETE WITH DIFFERENT QUALITY RECYCLED FINE AGGREGATE
The influence of recycled sand on the compressive strength of recycled fine aggregate concrete was investi-gated in this research.Three different recycled sand were used to replace natural river sand from 0 to 100%,and the compressive strength development law of C20,C30,C40,and C50 degrees of high fluidity concrete was studied.Re-sults showed that as the replacement rate of recycled sand increased,there were significant impact on strength in dif-ferent strength grades of concrete.As the strength grade increases,the impact of recycled sand replacement rate be-came more significant.When the replacement rate of recycled concrete sand reached 50%,40%,30%,and 20%in C20,C30,C40,and C50 of concrete,the corresponding concrete could reach the trial-mix strength,and then the strength decreased significantly with the further increase of replacement rate.When the replacement rates of red brick recycled sand were 30%,20%,20%,and 10%in C20,C30,C40,and C50 of concrete,the corresponding concrete could reach the corresponding trial-mix strength.The effect of 1:1 mixed recycled sand was between the above two re-cycled sands.Based on the consideration of compressive strength,it was recommended to control the replacement rate of river sand by recycled sand within 30%.It can be used as reference in the preparation of recycled sand concrete.
concreterecycled fine aggregaterecycled aggregate concretecompressive strength
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