矿物掺合料对胶凝材料浆体流变性能和触变性的影响
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摘要
基于大流态混凝土配合比,研究了各种矿物掺合料对胶凝材料浆体的流变性能和触变性的影响。结果表明:通过流变仪转速阶梯变化制度构建稳定的浆体流动状态,并利用转换方程可进行浆体流变性能参数的有效测量和计算。胶凝材料浆体的流变性能符合Bingham模型。粉煤灰和粉煤灰微珠均能降低浆体的屈服应力、塑性黏度和触变性,粉煤灰微珠作用效果更为明显;硅灰能增大浆体的屈服应力、塑性黏度和触变性;磨细矿渣粉会降低浆体的屈服应力和触变性,提高浆体的塑性黏度。在进行大流态混凝土配合比设计时应综合考虑矿物掺合料对新拌混凝土流变性能的影响。
Effect of mineral admixtures on the rheological properties and thixotropy of binder paste was investigated based on a mix proportion for concrete with a high fluidity. Based on a stable flowing state of paste obtained through a stairstep schedule of rotation speed of rheometer and the transfer equation, the rheological data of binder paste were measured and calculated. The rheological characteristics of the binder paste follow the Bingham model. The results show that fly ash and fly ash microbeads both can reduce the yield stress, plastic viscosity and thixotopy of the paste, and the effect of fly ash microbeads is more obvious. The addition of silica fume can increase the yield stress, plastic viscosity and thixotopy of the paste. The addition of ground granulated blast furnace slag can reduce the yield stress and thixotropy, but increase the plastic viscosity of the paste. The effect of mineral admixtures could be considered synthetically during the design of mix proportion for concrete with a high fluidity.
Effect of mineral admixtures on the rheological properties and thixotropy of binder paste was investigated based on a mix proportion for concrete with a high fluidity. Based on a stable flowing state of paste obtained through a stairstep schedule of rotation speed of rheometer and the transfer equation, the rheological data of binder paste were measured and calculated. The rheological characteristics of the binder paste follow the Bingham model. The results show that fly ash and fly ash microbeads both can reduce the yield stress, plastic viscosity and thixotopy of the paste, and the effect of fly ash microbeads is more obvious. The addition of silica fume can increase the yield stress, plastic viscosity and thixotopy of the paste. The addition of ground granulated blast furnace slag can reduce the yield stress and thixotropy, but increase the plastic viscosity of the paste. The effect of mineral admixtures could be considered synthetically during the design of mix proportion for concrete with a high fluidity.
引文
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[21]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.
[22]曹明莉,许玲,张聪.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[J].硅酸盐学报,2016,44(2):246-252.CAO Mingli,XU Ling,ZHANG Cong.J Chin Ceram Soc,2016,44(2):246-252.
[2]LAWRENCE P,CYR M,RINGOT E.Mineral admixtures in mortars:effect of inert materials on short-term hydration[J].Cem Concr Res,2003,33(12):1939-1947.
[3]吴凯,施惠生,徐玲琳,等.矿物掺合料调控界面过渡区微结构对混凝土力学性能的影响[J].硅酸盐学报,2017,45(5):623-630.WU Kai,SHI Huisheng,XU Linglin,et al.J Chin Ceram Soc,2017,45(5):623-630.
[4]刘运华,谢友均,龙广成.自密实混凝土研究进展[J].硅酸盐学报,2007,35(5):671-678.LIU Yunhua,XIE Youjun,LONG Guangcheng.J Chin Ceram Soc,2007,35(5):671-678.
[5]FERRARIS C F,OBLA K H,HILL R.The influence of mineral admixtures on the rheology of cement paste and concrete[J].Cem Concr Res,2001,31(2):245-255.
[6]黄大能.流变学在水泥与混凝土研究中的应用[J].混凝土世界,2011(9):21-26.HUANG Daneng.China Concr(in Chinese),2011(9):21-26.
[7]ZHAO M,ZHANG X,ZHANG Y.Effect of free water on the flowability of cement paste with chemical or mineral admixtures[J].Constr Build Mater,2016,111:571-579.
[8]PARK C K,NOH M H,PARK T H.Rheological properties of cementitious materials containing mineral admixtures[J].Cem Concr Res,2005,35(5):842-849.
[9]姜哲,刘建忠,刘加平.低水胶比下矿物掺合料对净浆流动性与流变性能的影响[J].混凝土,2011(5):67-69.JIANG Zhe,LIU Jianzhong,LIU Jiaping.Concrete(in Chinese),2011(5):67-69.
[10]吕利华,闫旭.矿物掺合料对水泥胶浆流变性能的影响[J].山西建筑,2015,41(22):126-128.LV Lihua,YAN Xu.Shanxi Archit(in Chinese),2015,41(22):126-128.
[11]胡茂福.不同粒径粉煤灰对水泥净浆流变性能的影响[J].广东水利水电,2013(7):11-13.HU Maofu.Guangdong Water Resour Hydropower(in Chinese),2013(7):11-13.
[12]吴惠民.矿物掺合料对水泥浆体流变性能的影响研究[J].广东建材,2017,33(10):7-9.WU Huimin.Guangdong Build Mater(in Chinese),2017,33(10):7-9.
[13]张林春,张爱莲,邓宏卫.矿物掺合料对新拌水泥浆体流变性能的影响[J].低温建筑技术,2010(5):6-7.ZHANG Linchun,ZHANG Ailian,DENG Hongwei.Low Temp Archit Technol(in Chinese),2010(5):6-7.
[14]WANG Q,WANG D,CHEN H.The role of fly ash microsphere in the microstructure and macroscopic properties of high-strength concrete[J].Cem Concr Compos,2017,83:125-137.
[15]马保国,付浩兵,王慧贤,等.矿物掺合料复掺对水泥基材料流变性能的影响[J].新型建筑材料,2013(8):1-4.MA Baoguo,FU Haobing,WANG Huixian,et al.New Build Mater(in Chinese),2013(8):1-4.
[16]VIKAN H,JUSTNES H.Rheology of cementitious paste with silica fume or limestone[J].Cem Concr Res,2007,37(11):1512-1517.
[17]刘娟红,张璇,韩方晖,等.含不同形态硅灰的复合胶凝材料浆体的流变学特性[J].硅酸盐学报,2017,45(2):220-226.LIU Juanhong,ZHANG Xuan,HAN Fanghui,et al.J Chin Ceram Soc,2017,45(2):220-226.
[18]BENAICHA M,ROGUIAE X,JALBAUD O,et al.Influence of silica fume and viscosity modifying agent on the mechanical and rheological behavior of self compacting concrete[J].Constr Build Mater,2015,84:103-110.
[19]WALLEVIK O H,FEYS D,WALLEVIK J E,et al.Avoiding inaccurate interpretations of rheological measurements for cement-based materials[J].Cem Concr Res,2015,78:100-109.
[20]赵晓,黎梦圆,韩建国,等.混凝土可泵性的室内与现场评价[J].工业建筑,2018,48(5):134-138.ZHAO Xiao,LI Mengyuan,HAN Jianguo,YAN Peiyu.Ind Constr(in Chinese),2018,48(5):134-138.
[21]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.
[22]曹明莉,许玲,张聪.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[J].硅酸盐学报,2016,44(2):246-252.CAO Mingli,XU Ling,ZHANG Cong.J Chin Ceram Soc,2016,44(2):246-252.
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