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

doi:10.11896/cldb.19010154

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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.

Key words： tunnel engineering lining shotcrete nitric acid attack carbonation neutralization depth prediction model

Published: 25 April 2020

CLC number:

TU528.44

Fund:This work was financially supported by the National Natural Science Foundation of China (51908440), Natural Science Foundation of Shannxi Province of China (2018JQ5032) and Natural Science Foundation of Shannxi Educational Committee (18JK0376) and National Innovation and Entrepreneurship Training Program for College Students (1070214008/201810702008).

About author:: Jiabin Wangreceived his Ph.D. degree in Structure Engineering from Xi’an University of Architecture and Technology (XAUAT) in 2017. He is currently a lecturer in Xi’an Technological University (XATU) and participates in the durability of shotcrete (sprayed concrete) and recycled aggregate concrete. In recent year, more than 30 papers have been published at home and abroad.

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	WANG Jiabin
	XU Yunzhe
	ZHANG Kaifeng
	WANG Bin

Cite this article:

WANG Jiabin,XU Yunzhe,ZHANG Kaifeng, et al. Neutralization Performance and Prediction Model of Lining Shotcrete on Alternation Effects of Nitric Acid and Carbonation[J]. Materials Reports, 2020, 34(8): 8058-8063.

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http://www.mater-rep.com/EN/10.11896/cldb.19010154 OR http://www.mater-rep.com/EN/Y2020/V34/I8/8058

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