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THE AUTOGENOUS SHRINKAGE OF CONCRETES PREPARED WITH THE BINDERS CONTAINING DIFFERENT KINDS OF MINERAL ADMIXTURE
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摘要: 对比研究纯水泥及含不同矿物掺合料(粉煤灰、石灰石粉、磨细矿渣粉)的高强混凝土早期(7 d以内)自收缩发展规律。结果表明：粉煤灰混凝土与石灰石粉混凝土的自收缩表现出相同的规律，均随粉煤灰或石灰石粉掺量的增加而呈准线性递减，且两者自收缩的大小也几乎相同；矿渣粉混凝土的自收缩在较早龄期随矿渣粉掺量增加而降低的幅度较粉煤灰和石灰石粉混凝土更显著，但自收缩随龄期增长的速率较大，特别是矿渣粉掺量越大的混凝土。矿渣粉混凝土的自收缩表现出先抑后扬的发展特性。Abstract: The autogenous shrinkage of concrete containing various amounts of mineral admixtures, namely fly ash, limestone powder and ground blast furnace slag was investigated under the condition of various water binder ratios.The test results indicate that autogenous shrinkage of concrete nearly reduces in proportion to adding percentage of fly ash and limestone powder, while considerably decreases at initial hydrating period for the concrete containing ground granular blast-furnace slag.The autogenous shrinkage of concrete containing ground granular blast-furnace slag increases obviously with the age, especially in the case of high adding percentage of ground granular blast-furnace slag.
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Key words:
- concrete /
- autogenous shrinkage /
- fly ash /
- limestone powder /
- blast furnace slag powder
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Tazawa E, Miyazawa S. Autogenous Shrinkage Caused by Self?Desiccation in Cementitious Material[C]//Proceedings of 9 th?International Congress on the Chemistry of Cement.1992:712-718. [2] Aitcin P C , Neville A M, Acker P. Integrated View of Shrinkage?Deformation[J]. Concrete Intetnational,1977,19(9):35-41. [3] 郑峰,水泥基材料自收缩动力学研究[D].北京:清华大学,2006. [4] 阎培渝.粉煤灰在复合胶凝材料水化过程中的作用机理[J].硅酸盐学报,2007,35(S1):167-171. [5] Soroka I, Setter N, The Effect of Fillers on Strength of Cement?Mortars[J]. Cement and Concrete Research,1977,7(4):449-456. [6] 肖开涛,董芸.石灰石粉对碾压混凝土性能的影响及其作用机理研究[C]//第五届碾压混凝土坝国际研讨会论文集.2007:506-513. [7] 张树青,杨全兵.矿粉混凝土的自收缩性能[J].低温建筑技术,2004(3):1-3. -
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