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Inner Mongolia Agricultural University (2020)

Study on Durability of Aeolian Sand Concrete under Wet-Dry-Wind Sand Erosion

董瑞鑫

Titre : Study on Durability of Aeolian Sand Concrete under Wet-Dry-Wind Sand Erosion

Auteur : 董瑞鑫

Grade : Master’s Theses 2020

Université : Inner Mongolia Agricultural University

Résumé
In recent years,greening the desert,people entering and retreating from the sand,and preventing and controlling desertification have become urgent ecological management issues in desertified areas in China.In order to change the research and development ideas,in order to transform the desert yellow sand into green water and green mountains,and green water and green mountains into Jinshan and Yinshan,this paper selects the aeolian sand in Ulanbu and desert of Inner Mongolia as fine aggregate.Aeolian sand replaces some river sand,and aeolian sand concrete with strength classes C20,C30,and C40 is prepared,and the aeolian sand concrete is thoroughly explored in a single aeolian sand erosion,a single dry-wet cycle,and the dry-wet-aeolian sand erosion coupling The durability problem and micro-pore characteristics under the action provide theoretical basis for the engineering construction of aeolian sand concrete under the sulfate environment in the wind-eroded area.The main research conclusions are as follows :(1)After the aeolian sand concrete undergoes a single dry-wet cycle or sulfate dry-wet cycle-wind-sand erosion erosion coupling,the proportion of multiple harmful holes increases significantly,and the characteristics of small pores to large pores exist in the concrete.After the aeolian sand concrete undergoes a single dry-wet cycle or sulfate dry-wet cycle-wind and sand blowout coupling effect,the cement slurry appears slender cracks and through cracks,and the sulfate and carbonate crystals generated by the chemical reaction adhere to the concrete pores.Which caused the concrete pores to develop into slender cracks and cracks under salt erosion.(2)In the whole process of aeolian sand erosion,the degree of damage of aeolian sand concrete to blowout pits is significantly greater than that of blowout gully.The main factor causing blowout damage of aeolian sand concrete is the normal stress perpendicular to the blown surface.The deterioration mechanism of aeolian sand concrete lies in the cement mortar hardness

Mots clés : Aeolian sand concrete; Dry-wet cycle; Aeolian sand erosion; Micro-morphology; Phase composition; Pore characteristics; Life prediction; Grey theory;

Présentation (CNKI)

Page publiée le 18 octobre 2020, mise à jour le 26 mars 2022