Study on Strength and Durability of Permeable Concrete Modified by Silica Fume and Activated Coal Gangue Powder
In order to study the influence of silica fume and activated coal gangue powder on the strength and durability of pervious concrete,silica fume and activated coal gangue powder were used to replace cement by the rate of 0%,5%,10%,15%,20%and 25%,respectively.Then,the fluidity of fresh concrete fresh concrete,the strength and durability of the hardened concrete were tested.The effects of silica powder and activated coal gangue powder on the basic characteristics of pervious con-crete,and the dosage range and applicability of the two materials are studied.The results show that:① Adding 10%～15%sili-ca fume and 10%activated coal gangue powder can effectively improve the strength characteristics of concrete,and the effect of silica fume on the strength improvement is better then that of activated coal gangue powder,but it will have an adverse effect on the fluidity and water permeability of the concrete.② As the erosion time of sulfuric acid solution and the number of freeze-thaw cycles increase,the compressive strength and mass ratio of concrete both decrease monotonously.According to the results,it is indicated that:① Adding 5%～10%silica fume and 5%activated coal gangue powder is beneficial to the long time corro-sion resistance of concrete by H2 SO4 solution;② Adding 5%～20%silica fume and 10%～15%activation coal gangue powder is beneficial to the acid rain-freeze-thaw cycle corrosion resistance of concrete.In comparison,silica fume is more beneficial to the long-term freeze-thaw durability of concrete.
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