关键词: 干旱区;混凝土;杆塔基础;碳化深度;力学性能

Abstract: By simulating the environmental characteristics of northwest arid areas and the loading conditions of transmission tower foundation , the indoor accelerated carbonation test of reinforced concrete members were carried out.The influence law of water-cement ratio, mineral admixtures, carbon dioxide concentration and stress state on the carbonation depth of concrete members and mechanical properties of carbonated concrete members were analyzed .The results show that the compressive strength of carbonated concrete increase with the decrease of water -cement ratio and the flexural strength of carbonated concrete decrease with the decrease of water -cement ratio.The incorporation of mineral admixtures does not significantly improve the carbonation resistance of concrete .The concrete carbonation depth in the tension zone is obviously larger than that of the compression zone .According to the characteristics of the arid area environment, a calculation method of the influence coefficient of relative humidity and carbon dioxide concentration for carbonation depth prediction model is proposed

Key words: arid area;concrete;tower foundation;depth of carbonization;mechanical property