Experimental Study On Carbonization Properties Of Magnesium Slag Concrete

In order to realize the goal of improving the anti carbonation performance of concrete, the objective of improving the anti carbonation performance of concrete is to improve the anti carbonation performance of concrete. The scheme and the single factor test scheme are designed. Carbonation law of magnesium slag concrete was studied by the method of rapid carbonation test, and the mechanism of the carbonation model was established. The following main conclusions are obtained:(1) magnesium slag has the dual effect of increasing the alkaline reserve and compensating the shrinkage deformation. It can improve the anti carbonation properties of C30 concrete. The relationship between the carbonization depth and the content of magnesium slag was power exponent(2) the effect of magnesium slag on the digestion time is very small, and it is a secondary factor. effects. In terms of carbonization, the magnesium slag can be removed to eliminate the link, and the production process of magnesium slag concrete is simplified.(3) The second hydration reaction of fly ash will consume Ca(OH)2,which is produced by hydration of cement, so that the alkalinity of concrete is decreased, and the carbonization depth is increased. But the effect of water reducing, filling, interface and hydration can improve the pore structure of concrete, the uniformity and density of concrete. Therefore, the effect of fly ash on the carbonation depth of concrete is dual. In this project, the relationship between carbonation depth of concrete and the amount of fly ash is negative.(4) The micro filler effect of powder, can both improve the pore structure of the concrete. It can prevent both CO2 and other substances to enter the concrete. But the pozzolanic effect of mineral synthetic material will make the secondary water reaction on Ca(OH)2. The reaction can reduce the alkaline reserve of concrete, which is an unfavorable factors. In this paper, the slag powder will make negative effects on the carbonation of concrete.(5) The porosity of concrete and the water cement ratio can reduce the alkaline reserve, the strength and the density of concrete, so as to reduce the anti- carbonation performance of concrete.