Experimental study on basic properties of plastic concrete with GS solidified material

Abstract

It is common for industrial wastes such as slag, steel slag and fly ash to replace cement in plastic concrete. GS solidified material is prepared by mixing the three in a certain proportion. What is the basic performance of GS solidified material plastic concrete? In view of this problem, the mix proportion design is carried out, based on the unconfined compressive strength test and improved flexible wall permeability test. The basic properties of GS solidified plastic concrete were studied. The results show that the fluidity increases with the increase of the water binder ratio and decreases with the increase of the bentonite content. The unconfined compressive strength and permeability coefficient decreases with the increase of the bentonite content, but the decrease is not obvious. The unconfined compressive strength increases with the decrease of the water binder ratio or the increase of age, at the age of 14 days the increase is large, and at the age of 28 and 60 days, the increase decreases with the increase of the bentonite content. The permeability coefficient decreases with the decrease of the water binder ratio. When the water binder ratio decreases from 1.9 to 1.7, the permeability coefficient improves greatly, from less than 10 cm·s to 10 cm·s. There is an inflection point between 13 and 18 days, before that, the permeability coefficient decreases rapidly, and then tends to be flat. When the water binder ratio is greater than or equal to 1.9, the permeability coefficient decreases slowly without the inflection point.