Experimental Study of the Deterioration Mechanism of Concrete in Xining Saline Soil Area

被引：0

作者：

Qiao H. ^{[1
,2
]}

Zhu B. ^{[1
]}

Chen D. ^{[1
]}

机构：

[1] Key Laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou

[2] Western Engineering Research Center of Disaster Mitigation in Civil Engineering of Ministry of Education, Lanzhou

来源：

| 1600年 / Editorial Board of Journal of Basic Science and卷 / 25期

关键词：

Concrete; Deterioration mechanism; Durability; Field exposure; Saline soil; Sulfate attack; Thaumasite;

D O I：

10.16058/j.issn.1005-0930.2017.04.015

中图分类号：

学科分类号：

摘要：

Durability experiments of different concrete specimens were conducted under multiple conditions. Combining the experimental data, relative mass evaluation parameter and relative dynamic elastic modulus evaluation parameter were selected as evaluating indicator to investigate the surface view, relative mass and relative dynamic elastic modulus variation of concrete. Meanwhile, scanning electron microscope, energy dispersive spectrum and X-ray diffraction were used to investigate the micro-mechanism and the mechanism of deterioration. The results show that evaluation parameter can better evaluate the damage process of concrete. The failure modes of concrete in Xining saline soil area are chemical corrosion and physical crystallization. Chemical corrosion has an accelerating effect on the deterioration of concrete. Interactions of two failure mode make concrete serious disruption. Main corrosion products are gypsum, calcium carbonate and thaumasite. Especially the thaumasite form of sulfate erosion is found in Xining saline soil area. Field exposed concretes in Xining area have been eroded by saline soil. Although the evaluation parameters changes in volatility, the concretes are still in early stage of degradation after 1 230 days. © 2017, The Editorial Board of Journal of Basic Science and Engineering. All right reserved.

引用

页码：805 / 815

页数：10

共 20 条

[1] Kabay N., Tufekci M.M., Kizilkanat A.B., Et al., Properties of concrete with pumice powder and fly ash as cement replacement materials, Construction and Building Materials, 85, pp. 1-8, (2015)
[2] Yu C., Sun W., Scrivener K., Degradation mechanism of slag blended mortars immersed in sodium sulfate solution, Cement and Concrete Research, 72, pp. 37-47, (2015)
[3] Shanahan N., Zayed A., Cement composition and sulfate attack. Part I, Cement and Concrete Research, 37, 4, pp. 618-623, (2007)
[4] Long G., Xie Y., Deng D., Et al., Deterioration of concrete in railway tunnel suffering from sulfate attack, Journal of Central South University of Technology, 18, 3, pp. 881-888, (2011)
[5] Chen J., Zhao S., Yao J., Thermal analysis of ettringite in concrete attacked by sodium sulfate in dry-wet cyclic environment, Journal of Basic Science and Engineering, 18, 6, pp. 950-958, (2010)
[6] Li C., Xu Z., Chen T., Effects of fly ash on thaumasite form of sulfate attack, Journal of Building Materials, 17, 4, pp. 685-689, (2014)
[7] Ramezanianpour A.M., Hooton R.D., Thaumasite sulfate attack in Portland and Portland-limestone cement mortars exposed to sulfate solution, Construction and Building Materials, 40, pp. 162-173, (2013)
[8] Gao R., Zhao S., Li Q., Et al., Experimental study of the deterioration mechanism of concrete under sulfate attack in wet-dry cycles, China Civil Engineering Journal, 43, 2, pp. 48-54, (2010)
[9] Jiang W., Chen X., Yan J., Et al., Durability of the corrosion-resistant concrete in saline soil area, Journal of Northeastern University(Natural Science), 29, 2, pp. 280-283, (2008)
[10] Qiao H., Zhou M., He Z., Et al., Research on performance of concrete in sulfate environment, Journal of Basic Science and Engineering, 17, 1, pp. 77-84, (2009)

← 1 2 →