Neutralization Performance and Prediction Model of Lining Shotcrete on Alternation Effects of Nitric Acid and Carbonation
WANG Jiabin1, XU Yunzhe1, ZHANG Kaifeng2, WANG Bin1
1 School of Civil & Architecture Engineering, Xi’an Technological University, Xi’an 710021, China; 2 China West Construction North Co.Ltd., Xi’an 710065, China
Abstract: Neutralization process of long highway tunnel lining shotcrete in general atmospheric environment which was corroded nitrogen and carbon dioxide in automobile exhaust was researched. The nitric acid attack and accelerated carbonation alternation experiment were carried out using nitric acid (pH=2) immersion method and accelerated carbonation. The influence of nitric acid attack, formed mothed of concrete and the mixtures on shotcrete neutralization depth were studied. For testing the pH value and nitrate ion content and characterizing the mineral composition and microscopy of neutralization layer, the neutralization mechanism was studied. Nitric acid attack accelerated shotcrete neutralization. With the same equivalent carbonization age, neutralization depth was much more than carbonation depth. And the difference between neutralization depth and carbonation depth increased with increasing of the equivalent carbonation age. Compressive strength growth rate of shotcrete was first low and then very high. The relationship between neutralization coefficient and mixture index which was in terms of water to binder ratio, dosage of fly ash and steel fiber content were subject to liner, parabola, and exponential distribution, respectively, and the neuralization depth prediction model was established.
王家滨, 许云喆, 张凯峰, 王斌. 硝酸侵蚀/碳化交替作用下衬砌喷射混凝土的中性化研究及预测模型[J]. 材料导报, 2020, 34(8): 8058-8063.
WANG Jiabin, XU Yunzhe, ZHANG Kaifeng, WANG Bin. Neutralization Performance and Prediction Model of Lining Shotcrete on Alternation Effects of Nitric Acid and Carbonation. Materials Reports, 2020, 34(8): 8058-8063.
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2020, Vol. 34 
