Sulfate Attack Resistance of Dolomite Cement-Based Materials

Abstract

Abstract: In order to investigate the effect of dolomite on the sulfate resistance of cement-based materials, the cement paste specimens and cement mortar specimens mixed by 10%, 20%, 30% (mass fraction, the same as below) dolomite were soaked in 5% MgSO₄ solution and 5% Na₂SO₄ solution at low temperature, and sulfate attack test was carried out. Changes of the macroscopic morphology of specimens were observed regularly, and the erosion products were quantitatively analyzed. Flexural strength and compressive strength of cement mortar specimens were measured for macroscopic analysis, and the effects of different types of sulfates on the formation of thaumasite were obtained. At the same time, the effect of dolomite on the products of cement cementitious system was investigated by thermodynamic simulation. The results show that when the dolomite content is 10%~20%, the formation of thaumasite is inhibited, the sulfate resistance of cement-based materials is greatly improved, and the flexural strength of cement mortar specimens is significantly improved, which is consistent with the result of thermodynamic simulation.

Key words: dolomite, cement-based material, sulfate, thermodynamic analysis, quantitative analysis, thaumasite

CLC Number:

TU528

ZHANG Chao, WEN Yong, LI Yuhang, LI Chengnuo, FENG Yanyu, ZHAO Ruixiang. Sulfate Attack Resistance of Dolomite Cement-Based Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(7): 2317-2325.

References

[1] 杨永敢. 硫酸盐环境下损伤混凝土的劣化机理与寿命预测[D]. 南京: 东南大学, 2019.
YANG Y G. Deterioration mechanism and life prediction of damaged concrete in sulfate environment[D]. Nanjing: Southeast University, 2019 (in Chinese).
[2] 姜磊, 牛荻涛. 硫酸盐侵蚀作用下混凝土损伤层与微观研究[J]. 硅酸盐通报, 2015, 34(12): 3462-3467.
JIANG L, NIU D T. Damage layer and microscopic analysis of concrete under sulfate attack[J]. Bulletin of the Chinese Ceramic Society, 2015, 34(12): 3462-3467 (in Chinese).
[3] SKAROPOULOU A, SOTIRIADIS K, KAKALI G, et al. Use of mineral admixtures to improve the resistance of limestone cement concrete against thaumasite form of sulfate attack[J]. Cement and Concrete Composites, 2013, 37: 267-275.
[4] NIELSEN P, NICOLAI S, DARIMONT A, et al. Influence of cement and aggregate type on thaumasite formation in concrete[J]. Cement and Concrete Composites, 2014, 53: 115-126.
[5] 徐江涛, 卢都友, 张少华, 等. 40 ℃和60 ℃养护时含白云石微粉砂浆的强度和水化产物[J]. 硅酸盐学报, 2016, 44(11): 1588-1594.
XU J T, LU D Y, ZHANG S H, et al. Strength and hydration products of cement mortars with dolomite powders cured at 40 ℃ and 60 ℃[J]. Journal of the Chinese Ceramic Society, 2016, 44(11): 1588-1594 (in Chinese).
[6] 傅博, 程臻赟, 何妍亭, 等. 矿渣对水泥石抗碳硫硅钙石型硫酸盐腐蚀性能的影响[J]. 硅酸盐通报, 2020, 39(2): 471-476.
FU B, CHENG Z Y, HE Y T, et al. Effect of slag on thaumasite sulfate attack resistance of cement paste[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(2): 471-476 (in Chinese).
[7] 高小建, 马保国, 董荣珍. Thaumasite的结构、形成机理及对混凝土的破坏作用[J]. 硅酸盐通报, 2005, 24(1): 51-54+59.
GAO X J, MA B G, DONG R Z. Structural characteristic and formation mechanism of thaumasite and its destruction effect on concrete[J]. Bulletin of the Chinese Ceramic Society, 2005, 24(1): 51-54+59 (in Chinese).
[8] GOUDA G R, ROY D M, SARKAR A. Thaumasite in deteriorated soil-cements[J]. Cement and Concrete Research, 1975, 5(5): 519-522.
[9] CRAMMOND N J. The thaumasite form of sulfate attack in the UK[J]. Cement and Concrete Composites, 2003, 25(8): 809-818.
[10] CRAMMOND N. The occurrence of thaumasite in modern construction: a review[J]. Cement and Concrete Composites, 2002, 24(3/4): 393-402.
[11] HOBBS D W, TAYLOR M G. Nature of the thaumasite sulfate attack mechanism in field concrete[J]. Cement and Concrete Research, 2000, 30(4): 529-533.
[12] FREYBURG E, BERNINGER A M. Field experiences in concrete deterioration by thaumasite formation: possibilities and problems in thaumasite analysis[J]. Cement and Concrete Composites, 2003, 25(8): 1105-1110.
[13] 马保国, 高小建, 何忠茂, 等. 混凝土在SO^2-₄和CO^2-₃共同存在下的腐蚀破坏[J]. 硅酸盐学报, 2004, 32(10): 1219-1224.
MA B G, GAO X J, HE Z M, et al. Corrosion damage of concrete in presence of SO^2-₄ and CO^2-₃[J]. Journal of the Chinese Ceramic Society, 2004, 32(10): 1219-1224 (in Chinese).
[14] 胡明玉, 唐明述, 龙伏梅. 新疆永安坝混凝土的碳硫硅钙石型硫酸盐腐蚀[J]. 混凝土, 2004(11): 5-7.
HU M Y, TANG M S, LONG F M. Thaumasite form of sulfate attack in the concrete of Yong'an Dam[J]. Concrete, 2004(11): 5-7 (in Chinese).
[15] CHU H Y, CHEN J K. Evolution of viscosity of concrete under sulfate attack[J]. Construction and Building Materials, 2013, 39: 46-50.
[16] SOTIRIADIS K, NIKOLOPOULOU E, TSIVILIS S. Sulfate resistance of limestone cement concrete exposed to combined chloride and sulfate environment at low temperature[J]. Cement and Concrete Composites, 2012, 34(8): 903-910.
[17] RAMEZANIANPOUR A M, HOOTON R D. Thaumasite sulfate attack in Portland and Portland-limestone cement mortars exposed to sulfate solution[J]. Construction and Building Materials, 2013, 40: 162-173.
[18] 马保国, 付浩兵, 王迎斌, 等. Mg²⁺条件下不同温度对碳硫硅钙石生成过程的影响研究[J]. 混凝土, 2015(2): 1-3+9.
MA B G, FU H B, WANG Y B, et al. InfIuence of different temperature on Thaumasite generation process research under Mg²⁺ ions[J]. Concrete, 2015(2): 1-3+9.(in Chinese)
[19] DIAMOND S. Thaumasite in Orange County, Southern California: an inquiry into the effect of low temperature[J]. Cement and Concrete Composites, 2003, 25(8): 1161-1164.
[20] 王政, 高小建, 马保国. 掺石灰石粉水泥胶砂低温硫酸盐侵蚀破坏与机理[J]. 沈阳建筑大学学报(自然科学版), 2008, 24(1): 95-99.
WANG Z, GAO X J, MA B G. Deterioration mechanism of limestone filler cement mortar exposed to sulfate attack at lower temperature[J]. Journal of Shenyang Jianzhu University Natural Science, 2008, 24(1): 95-99 (in Chinese).
[21] 张恒. 硫酸钠盐渍土盐胀冻胀机理及电化学防治技术研究[D]. 广州: 华南理工大学, 2020.
ZHANG H. Study on the mechanism of salt swelling and frost heaving of sodium sulfate saline soil and its electrochemical prevention and control technology[D]. Guangzhou: South China University of Technology, 2020 (in Chinese).
[22] 凌康, 卢都友, 徐江涛, 等. 含白云石微粉水泥砂浆的抗硫酸盐侵蚀性能[J]. 硅酸盐学报, 2018, 46(2): 224-229.
LING K, LU D Y, XU J T, et al. Sulfate resistance of Portland cement mortars with dolomite powders[J]. Journal of the Chinese Ceramic Society, 2018, 46(2): 224-229 (in Chinese).
[23] TSIVILIS S, KAKALI G, SKAROPOULOU A, et al. Use of mineral admixtures to prevent thaumasite formation in limestone cement mortar[J]. Cement and Concrete Composites, 2003, 25(8): 969-976.
[24] KAKALI G, TSIVILIS S, SKAROPOULOU A, et al. Parameters affecting thaumasite formation in limestone cement mortar[J]. Cement and Concrete Composites, 2003, 25(8): 977-981.
[25] 肖佳, 吴婷, 何彦琪, 等. 水泥-白云石粉浆体流变性能研究[J]. 硅酸盐通报, 2016, 35(3): 891-896.
XIAO J, WU T, HE Y Q, et al. Rheological properties of cement-ground dolomite[J]. Bulletin of the Chinese Ceramic Society, 2016, 35(3): 891-896 (in Chinese).
[26] LIU Z Q, DENG D H, DE SCHUTTER G, et al. The effect of MgSO₄ on thaumasite formation[J]. Cement and Concrete Composites, 2013, 35(1): 102-108.
[27] 徐江涛, 卢都友, 张少华, 等. 不同养护温度下含白云石和石灰石微粉砂浆的孔结构[J]. 硅酸盐学报, 2017, 45(2): 268-273.
XU J T, LU D Y, ZHANG S H, et al. Pore structures of mortars with dolomite and limestone powders cured at various temperatures[J]. Journal of the Chinese Ceramic Society, 2017, 45(2): 268-273 (in Chinese).