硅酸盐学报

不同水灰比、砂灰比下碳酸钙晶须对水泥砂浆流变性的影响

作者：曹明莉许玲张聪

分类号：TB 332

出版年,卷(期):页码：2016,44(2):240-247

DOI：10.14062/j.issn.0454-5648.2016.02.09

摘要：

采用旋转流变仪研究碳酸钙晶须增强水泥砂浆拌合物的流变性能。分析不同水灰比、砂灰比及碳酸钙晶须掺量下，新拌砂浆的屈服应力、塑性黏度和滞回环面积的变化。结果表明：碳酸钙晶须增强水泥砂浆拌合物的流变性符合Bingham模型；水灰比从0.35减小至0.30时，新拌碳酸钙晶须水泥砂浆的屈服应力、塑性黏度均增大，最大增幅分别为92倍和4.8倍；碳酸钙晶须掺量从0增大至2.5%时，新拌碳酸钙晶须水泥砂浆的屈服应力、塑性黏度均呈增大趋势，最大增幅分别为24.5倍和1.64倍；分析滞回环面积的变化，表明随着水灰比的减少和晶须掺量的增加，浆体内部阻碍流动的絮凝结构和网状结构的数量增大，这也是导致拌合物流动性差、流变参数大的主要原因。

The rheological properties of fresh calcium carbonate whisker reinforced cement mortar were determined using rotational rheometer. The yield stress, plastic viscosity and the area of hysteresis loop of fresh mortars at different water/cement ratios, sand/cement ratios and calcium carbonate whisker content were analyzed. The results indicate that the fresh calcium carbonate cement mortar mixtures follow the Bingham model. The yield stress and plastic viscosity increase with decreasing water/cement ratio from 0.35 to 0.30, resulting in the maximum increased amplifications of 92.0 and 4.8 times, respectively. The yield stress and plastic viscosity increase with increasing the content of calcium carbonate whisker from 0 to 2.5%, leading to the maximum increased amplifications of 24.5 and 1.6 times, respectively. The analysis of the hysteresis loop area shows that the quantity of flocculation and reticulation structures increase with the decrease of water cement ratio and the increase of calcium carbonate whisker amount, leading to the poor fluidity and high rheological parameters of the mixtures.

基金项目：

国家自然科学基金项目(51478082)。

作者简介：

第一作者：曹明莉(1971—)，女，博士，副教授。E-mail: caomingli_research@163.com

参考文献：

[1] Malhotra V M. The rheology of fresh concrete [J]. Cana J Civ Eng, 1984, 11(1): 135.

[2] 徐文, 郭飞, 田倩. 不同超塑化剂掺量下石灰石粉水泥净浆流变性能[J]. 建筑材料学报, 2014(02): 274–279.XU Wen, GUO Fei, TIAN Qian. J Build Mater, 2014(02): 274–279.

[3] Corinaldesi V, Moriconi G. The role of industrial by-products in self-compacting concrete [J]. Construct Build Mater, 2011, 25(8): 3181–3186.

[4] 位建强. 碳酸钙晶须增强水泥基复合材料的基础研究 [D]. 大连: 大连理工大学, 2011.WEI Jianqiang. Basic study of CaCO3 whisker-reinforced cement based composites. Dalian: Dalian Univ Technol, 2011.

[5] Wei J. Microstructure and mechanical properties of CaCO3 whisker-reinforced cement [J]. J Wuhan Univ Technol-Mater, 2011, 26(5): 1004–1009.

[6] Cao M, Zhang C, Wei J. Microscopic reinforcement for cement based composite materials [J]. Construct Build Mater, 2013, 40: 14–25.

[7] 马昆林, 龙广成, 谢友均, 等. 水泥-粉煤灰-石灰石粉复合浆体的流变性能 [J]. 硅酸盐学报, 2013, 41(5): 582–587.MA Kunlin, LONG Guangcheng, XIE Junyou, et al. J Chin Ceram Soc, 2013, 41(5): 582–587.

[8] 马昆林, 龙广成, 谢友均, 等. 水泥–粉煤灰–石灰石粉浆体塑性黏度的影响因素 [J]. 硅酸盐学报, 2013, 41(11): 1481–1486.MA Kunlin, LONG Guangcheng, XIE Junyou, et al. J Chin Ceram Soc, 2013, 41(11): 1481–1486.

[9] Banfill P. The rheology of cement and concrete - a review [A] // Proc 11th international congress on the chemistry of cement[C]. Durban, South Africa, 2003, 1: 50–62.

[10] Wong H H C, Kwan A K H, Fung W W S. Water film thickness, flowability and rheology of cement–sand mortar [J]. Adv Cemt Res, 2010, 22(1): 3–14.

[11] Kwan A K H, Fung W W S. Roles of water film thickness and SP dosage in rheology and cohesiveness of mortar [J]. Cem Concr Compos, 2012, 34(2): 121–130.

[12] Vikan H, Justnes H. Rheology of cementitious paste with silica fume or lime stone [J]. Cem Concr Res, 2007, 37(11): 1512–1517.

[13] Kuder K G, Ozyurt N, Mu E B, et al. Rheology of fiber-reinforced cementitious materials [J]. Cem Concr Res, 2007, 37(2): 191–199.

[14] Williams D A, Saak A W, Jennings H M. The influence of mixing on the rheology of fresh cement paste [J]. Cem Concr Res, 1999, 29(9): 1491–1496.

[15] 唐修生, 蔡跃波, 温金保, 等. 磨细矿渣复合浆体流变参数与流动度的相关性 [J]. 硅酸盐学报, 2014, 42(5): 648–652.TANG Xiusheng, CAI Yuebo, WEN Jinbao, et al. J Chin Ceram Soc, 2014, 42(5): 648–652.

[16] 王栋民, 张力冉, 张伟利, 等. 超塑化剂对新拌水泥浆体多级絮凝结构的影响 [J]. 建筑材料学报, 2012, 15(06): 755–759.WANG Dongmin, ZHANG Liran, ZHANG Weili, et al. J Build Mater, 2012, 15(06): 755–759.

服务与反馈：

【文章下载】【加入收藏】