首页期刊信息编委及顾问期刊发行联系方式使用帮助常见问题ENGLISH
位置:首页 >> 正文
含白云石微粉水泥砂浆的抗硫酸盐侵蚀性能
作者:  卢都友 徐江涛 张少华 许仲梓 
单位:南京工业大学材料科学与工程学院 南京 210009 
关键词:白云石微粉 石灰石微粉 硫酸盐侵蚀 膨胀率 强度 抗蚀系数 
分类号:TQ172
出版年,卷(期):页码:2018,46(2):0-0
DOI:
摘要:

为评估白云石微粉对水泥抗硫酸盐侵蚀性能的影响,以石灰石微粉为参照,研究了白云石微粉掺量(质量分数)分别为10%、20%、30%时,水泥砂浆在质量浓度为5%硫酸钠溶液中的变形和强度发展规律,并讨论了基于抗蚀系数的含碳酸盐岩微粉水泥抗硫酸盐侵蚀性能评价方法。结果表明:砂浆试体在Na2SO4溶液中的变形过程可分为稳定期、缓慢膨胀期和加速膨胀期3个阶段。除掺10%白云石微粉试体外,其余含碳酸盐岩微粉砂浆的膨胀率均大于空白样(PC)。与掺石灰石微粉试体相比,含白云石微粉试体起始膨胀的龄期滞后,同期膨胀小,且两者膨胀差异随龄期延长和掺量增加呈增大趋势。无论在水中还是在Na2SO4溶液中,掺碳酸盐岩微粉砂浆抗压和抗折强度发展趋势均与PC类似,但强度均降低,且掺量越大,强度降幅越大。与在水中养护时强度持续缓慢增长不同,掺碳酸盐岩微粉砂浆强度在Na2SO4溶液中经历先快速增长至峰值,而后降低的过程。与含石灰石微粉试体相比,含白云石微粉砂浆强度达到峰值的龄期滞后且后期强度高。标准规定的28 d抗蚀系数K28不能确切反映含碳酸盐岩微粉水泥抗硫酸盐侵蚀性能。采用试体起始膨胀或强度达峰值龄期的抗蚀系数可提高判定结果的准确性和可靠性。

To evaluate the effect of dolomite powder on the sulfate resistance of Portland cement, a comparative study was performed on the sulfate resistance of Portland cement mortars containing dolomite powder (limestone powder as a reference). The expansion and strength change of mortars with various replacements of dolomite powder (i.e., 10%, 20% and 30%, mass fraction) were investigated in 5% sodium sulfate solution. A method based on sulfate-resisting index for evaluating the sulfate resistance of cement with the carbonate mineral powders was proposed as well. Results indicate that the process of mortars expansion can be divided into three stages, i.e., stable period, slow period and accelerate period. The mortars with carbonate mineral powders except for the specimens with 10% dolomite powder give larger expansion than that of PC. Compared to the mortars with limestone powder, dolomite-containing mortars show a delayed start in expansion and develop a lower expansion at the same age. The difference in expansion is more pronounced with prolonging immersed immersion in Na2SO4 solution and the increase of the powder dosages. The mortars with carbonate mineral powders in either water or sodium sulfate solution develop a similar trend with PC, but have lower compressive and flexural strengths. The greater replacement of carbonate powders in mortars , the lower values in the strength . The strength of mortars immersed in water increases, but the strength of mortars in sulfate solution firstly increases and then decreases. Compared to the mortars with limestone powder, the mortars with dolomite powder achieve the maximum strength for a longer time and have a greater strength at later period. The sulfate resistant index at 28 d K28 specified in the standard can not accurately reflect the sulfate resistance of the cement with carbonate mineral powders. The sulfate resistance index at the age of starting expansion or reducing attaining peak strength could be applied to improve the accuracy and reliability.
 
基金项目:
国家自然科学基金资助项目(51472116)。
作者简介:
凌 康(1991—),男,硕士研究生。
参考文献:

[1] IRASSAR E F, VIOLINI D, RAHHAL V F, et al. Influence of limestone content, gypsum content and fineness on early age properties of Portland limestone cement produced by inter-grinding[J]. Cem Concr Compos, 2011, 33(2): 192–200.

[2] 张少华, 卢都友, 徐江涛, 等. 白云石和石灰石微粉对水泥砂浆强度和水化产物的影响[J]. 硅酸盐学报, 2016, 44(8): 1126–1133.
ZHANG Shaohua, LU Duyou, XU Jiangtao, et al. J Chin Ceram Soc, 2016, 44(8): 1126–1133.
[3] LOTHENBACH B, SAOUT G L, GALLUCCI E, et al. Influence of limestone on the hydration of Portland cements[J]. Dentomaxillofacial Radiology, 2008, 38(6): 848–860.
[4] ZAJAC M, DIENEMANN W, BOLET G. Comparative experimental and virtual investigation of the influence of calcim and magnesium carbonates on reacting cement [A]/Proc 13th ICCC [C]. Madrid, Spain, 2011.
[5] SZYBILSKI M, NOCU?-WCZELIK W. The Effect of Dolomite Additive on Cement Hydration[J]. Pro Eng, 2015, 108: 193–198.
[6] 陆采荣, 戈雪良, 梅国兴, 等. 白云岩石粉在复合胶凝体系内的水化特性研究[J]. 混凝土, 2013(11): 65–67.
LU Cairong, GE Xueliang, Mei Guoxing, et al. Concrete (in Chinese), 2013(11): 65–67.
[7] 陆采荣, 戈雪良, 梅国兴, 等. 白云岩石粉对水泥胶凝体系力学性能及孔结构的影响[J]. 材料导报, 2013, 27(s2): 305–306.
LU Cairong, GE Xueliang, MEI Guoxing, et al. Mater Rev (in Chinese), 2013, 27(s2): 305–306.
[8] 彭园, 高育欣, 赵日煦, 等. 白云石粉用作混凝土掺合料的试验研 
究[J]. 混凝土与水泥制品, 2014(6): 13–16.
PENG Yuan, GAO Yuxin, ZHAO Rixun, et al. Chin Concr Cem Prod (in Chinese), 2014(6): 13–16.
[9] 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 Jiangtao, LU Duyou, ZHANG Shaohua , et al. J Chin Ceram Soc, 2016, 44(11): 1588–1594.
[10] 徐江涛, 卢都友, 张少华, 等. 不同温度条件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 Jiangtao, LU Duyou, ZHANG Shaohua , et al. J Chin Ceram Soc, 2017, 45(2): 268–273.
[11] RAHMAN M M, BASSUONI M T. Thaumasite sulfate attack on concrete: Mechanisms, influential factors and mitigation[J]. Construct Build Mater, 2014, 73: 652–662.
[12] HOSSACK A M, THOMAS M D A. Evaluation of the effect of tricalcium aluminate content on the severity of sulfate attack in Portland cement and Portland limestone cement mortars[J]. Cem Concr Compos, 2015, 56: 115–120.
[13] RAMEZANIANPOUR A M, HOOTON R D. Thaumasite sulfate attack in Portland and Portland-limestone cement mortars exposed to sulfate solution[J]. Constru Build Mater, 2013, 40(3): 162–173.
[14] JUSTNES H. Thaumasite formed by sulfate attack on mortar with limestone filler[J]. Cem Concr Compos, 2003, 25(8): 955–959. 
[15] HOBBS D W. Thaumasite sulfate attack in field and laboratory concretes: implications for specifications[J]. Cem Concr Compos, 2003, 25(8): 1195–1202. 
[16] IRASSAR E F, BONAVETTI V L, TREZZA M A, et al. Thaumasite formation in limestone filler cements exposed to sodium sulphate solution at 20 ℃[J]. Cem Concr Compos, 2005, 27(1): 77–84.
[17] ZHANG F, BAOGUO M A, GENG Y, et al. Erosion substance of cement-based material in sulfate attack environment at low temperature[J]. J Chin Ceram Soc, 2008, 36(10): 1411–1416.
[18] IRASSAR E F, BONAVETTI V L, GONZALEZ M. Microstructural study of sulfate attack on ordinary and limestone Portland cements at ambient temperature[J]. Cem Concr Res, 2003, 33(1): 31–41.
[19] GB/T 749—2008, 水泥抗硫酸盐侵蚀实验方法[S]. 北京: 中国标准出版社, 2008.
 
 
服务与反馈:
文章下载】【加入收藏
中国硅酸盐学会《硅酸盐学报》编辑室
京ICP备10016537号-2
京公网安备 11010802024188号
地址:北京市海淀区三里河路11号    邮政编码:100831
电话:010-57811253  57811254    
E-mail:jccs@ceramsoc.com