Study On The Durability Of Aeolian Sand Mortar Based On Deicing Salt

This topic research on the aeolian sand of Inner Mongolia Ordos Kubuqi Desert is used as admixture. Meanwhile^ the internal mixing 0%.10%,15%.20%,30% and 40% instead of sand as fine aggregate, and made up M10 strength grade of aeolian sand mortar.Through mechanical performance test, the drying-weting resistance performance and the freezing-thawing resistance performance test with the aid of scanning electron microscope and RapidAir457 Air Void Analysis of Hardened Mortar, the internal microstructures of mortar have been analyzed to explore the influence mechanism of aeolian sand on the mechanical performance and durability of aeoolian sand mortar, so as to obtain the appropriate mix content of aeolian sand in aeolian sand mortar. By analyzing the stress-strain relationship of aeolian sand mortar with different aeolian sand content, the constitutive equations were built. The test results show that when the mix content of aeolian sand is 15%, the mechanical performance of aeolian sand mortar in all ages will be improved significantly; aeolian sand can accelerate early hydration of mortar, while itself has later hydration activity to improve the compactness of mortar matrix and Aeolian sand-sand-mortar interface transition zone; the internal mixing of 15% aeolian sand can effectively upgrade the drying-weting resistance performance of aeolian sand mortar in the·early stage of drying-weting cycles, while degrade the drying-weting resistance performance in the late stage of drying-weting cycles; the internal mixing of 15% aeolian sand can effectively upgrade the freezing-thawing resistance performance of aeolian sand mortar in the early stage of freezing-thawing cycles, while degrade the freezing-thawing resistance performance in the late stage of freezing-thawing cycles.The measured relative and average dynamic elastic modulus of aeolian sand mortar under different drying-weting cycles and different erosion concentration is used with the aid of MATLAB software for fitting the drying-weting damage prediction model of aeolian sand mortar with aeolian sand content. The results show that the damage of aeolian sand cement mortar trends from good to bad with the increase of aeolian sand content; the damage of aeolian sand cement mortar trends from good to bad with the increase of drying-weting cycles. The fitting values of mechanical damage evolution equation are very consistent with experimental values, providing a theoretical basis for prediction on drying-weting resistance performance.