Abstract
Water absorption rate of the recycled coarse aggregate is higher than the natural ones. Until now, there is no test method to record the instantaneous value of the water absorption although this could help us to understand the recycled coarse aggregate better. This paper developed a new device that can record the water absorption continuously and calculate the water absorption rate automatically. The water absorption curve from 0 min to 60 min can be plotted smoothly. The performances of modified recycled coarse aggregate and concretes with recycled coarse aggregate have also been studied. The result shows that the water absorption rate increases fast and about 90% water has been absorbed during the first 10 min. The slurry of silicon nitride with 500 nm particle size can reduce the 10 min water absorption rate of the recycled coarse aggregate from above 4.5% to below 2.5%. A recycled coarse aggregate wrapped with wet slurry is better than the ones wrapped with dry slurry shell for the slump of concrete. Compared to the concrete without any recycled coarse aggregate, the compressive strength and the splitting tensile strength of the concrete with recycled coarse aggregate modified by fresh cement slurry have been increased by more than 20%.
Highlights
In the reconstruction and extension project of highway, there are concrete structures, such as bridges, the concrete pavement, retaining walls and curbs that need to be torn down
The purpose of this paper is to investigate the timely water absorption of the recycled aggregate during 0–60 min and find a properly modified method for decreasing the water absorption of the recycled coarse aggregate
In order to obtain common rules common for waterrules absorption recycled coarse aggregate, In order to obtain for waterofabsorption of recycled coarse aggrega two different origin are prepared
Summary
In the reconstruction and extension project of highway, there are concrete structures, such as bridges, the concrete pavement, retaining walls and curbs that need to be torn down. A lot of old concrete materials need to be dealt with. If thrown away, they will occupy a quite large field area. They will occupy a quite large field area Will it lead to the waste of resources, and cause environmental problems. Crushing them into coarse aggregate and recycling them into the project would be a good way. Some countries, such as Germany, Japan, Denmark and Korea, have drafted technical regulations to normalize the recycling of concrete [1]
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