Influence Of Slag On Mechanical Property And Durability Of Concrete

The influence of moist-curing time at early ages and the content of ground granulated blast furnace slag on mechanical property and durability of concrete was studied in this thesis. Based on compressive strength test, flexural strength test and other mechanical property tests, the variation of mechanical property of concrete with the content of slag was studied. Based on the changing of the dynamic elastic modulus and the weight, the effect of moist-curing time at early ages and the content of slag on freezing-thawing resistance of concrete was studied. Based on chloride permeability test, the variation of the chloride-penetration resistance of concrete with the content of slag was studied. Based on accelerated carbonation test, the variation of carbonation resistance of concrete with content of slag was studied.Results of the experiments indicate:(1)Under conditions of28d standard-curing, the compressive strength of the concrete increased with the content of slag increasing and then decreased.(2)The freezing-thawing resistance of concrete decreased with the reduction in moist-curing time at early ages.(3)The freezing-thawing resistance of concrete decreased with the increase in the content of slag.(4)The compressive strength and the freezing-thawing resistance of concrete with20%slag increased with the increase in the content of nano-SO2or silica fume.(5)The chloride-penetration resistance of concrete increased with the increase in the content of slag.(6)The carbonation resistance of the concrete decreased with the increase in the content of slag.