Abstract: In this paper, the diatomite were wetted to be used as the admixture in high-strength concrete in order to solve its early cracking problem. The effect of pre-wetted diatomite (the mass fraction of dry diatomite are 1%, 3% and 5%) on the early-age cracking resistance and the basic mechanical performance of high-strength concrete were studied. Water losing principle of the pre-wetted diatomite high-strength concrete was also tested by evaporation test. The results showed that the pre-wetted diatomite could significantly improve the early cracking resistance of the high-strength concrete. When the mass fraction of dry diatomite are 1%, 3% and 5%, the early cracking area of concrete were reduced by 31.8%, 54.4% and 65.8%. Meanwhile, the pre-wetted diatomite could significantly reduce the water losing of concrete, which inhibits plastic shrinkage. In addition, the incorporation of the pre-wetted diatomite could increases the tensile strength and the ratio of tension and compressive strength, and had no great negative effect on the compressive strength.
姜丰, 史亚龙, 张洪恩, 石宵爽, 王清远. 预吸水硅藻土对高强混凝土早期抗裂性能的影响[J]. 材料导报, 2018, 32(20): 3541-3545.
JIANG Feng, SHI Yalong, ZHANG Hongen, SHI Xiaoshuang, WANG Qingyuan. Effect of the Pre-wetted Diatomite on the Cracking Resistance of High-strength Concrete at Early-age. Materials Reports, 2018, 32(20): 3541-3545.
1 Huang S Y. The reflection of high performance concrete development[J].Concrete,2003(7):3(in Chinese). 黄士元.高性能混凝土发展的回顾与思考[J].混凝土,2003(7):3. 2 Paul J Uno. Plastic shrinkage cracking and evaporation formulas [J]. ACI Materials Journal,1998,95(4):365. 3 Gui M M. Research progress about plastic shrinkage cracking of concrete[J]. Materials Review A: Review Papers,2011,25(11):76(in Chinese). 桂苗苗.混凝土早期塑性收缩开裂的研究进展[J].材料导报:综述篇,2011,25(11):76. 4 Van Breugel K, Van Tuan N. Autogenous shrinkage of HPC and ways to mitigate it[J]. Key Engineering Materials,2015,629-630:3. 5 Shi J C, Lu K X, Ma X W,et al. Influence of SAP on the properties of self-compacting concrete[J]. Materials Review B: Research Papers,2015,29(10):118(in Chinese). 史才军,吕奎喜,马先伟,等.高吸水性树脂对自密实混凝土性能的影响[J].材料导报:研究篇,2015,29(10):118. 6 Han S, An M Z, Guo R, et al. Crack resistance of ceramsite self-curing high performance concrete[J]. Journal of Building Materials,2015,18(5):742(in Chinese). 韩松,安明喆,郭瑞,等.陶粒内养护高性能混凝土抗裂性能研究.建筑材料学报,2015,18(5):742. 7 Song X Y, Han J Y, Sun B J, et al. Comparison of effects of several kinds of mineral admixtures on brittleness and early-age cracking performance of concrete[J]. China Concrete and Cement,2017(6):86(in Chinese). 宋旭艳,韩静云,孙宝金,等.几种矿物掺合料对混凝土脆性及早期开裂性能影响比较[J].混凝土与水泥制品,2017(6):86. 8 Xiao J, Chen L, Xing H. Influence of fly ash and slag powder on autogenous shrinkage of cement mortars[J]. Journal of Building Materials,2011,14(5):604(in Chinese). 肖佳,陈雷,邢昊.粉煤灰和矿粉对水泥胶砂自收缩的影响[J].建筑材料学报,2011,14(5):604. 9 Kastis D, Kakali G, Tsivilis S, et al. Properties and hydration of blended cements with calcareous diatomite[J]. Cement and Concrete Research,2006,36:1821. 10 Wang B M, Song K, Han Y. Research on the comprehensive utilization of diatomite[J].Materials Review,2011,25(S2):468(in Chinese). 王宝民,宋凯,韩瑜.硅藻土资源的综合利用研究[J].材料导报,2011,25(专辑18):468. 11 Zhang Z L. Investigation on the shrinkage-reducing effect of super-absorbent polymer in high-strength concrete and its mechanism[D]. Beijing: Tsinghua University,2013(in Chinese). 张珍林.高吸水性树脂对高强混凝土早期减缩效果及机理研究[D].北京:清华大学,2013. 12 Cui Z Z, Wang J F, Zhang C, et al. Effect of magnesium slag and slag composite on early crack resistance of concrete [J]. Science Technology and Engineering,2016,16(8):281(in Chinese). 崔自治,王建峰,张程,等.镁渣矿粉复合对混凝土早期抗裂的影响研究[J].科学技术与工程2016,16(8):281. 13 Chen Y, He Z, Wang L, et al. Effect of internal-curing on hydration and microstructure of cement[J]. Concrete,2010(12):40(in Chinese). 陈衍,何真,王磊,等.内养护对水泥浆水化及微观结构的影响[J].混凝土,2010(12):40. 14 Sun Q H, Wei Y Q, Meng Y F. Preparation and properties of high performance recycled concrete (HPRC) ameliorated by calcined dia-tomite[J]. Concrete,2012(9):129(in Chinese). 孙庆和,魏永起,孟云芳.硅藻土改性高性能混凝土的制备及性能[J].混凝土,2012(9):129. 15 Zheng J L, Luo S R, Wang X F. The research on the cracking behavior of high performance concrete[J]. Engineering Mechanics,2008,25(S2):72(inChinese). 郑建岚,罗素蓉,王雪芳.高性能混凝土抗裂性能研究[J],工程力学,2008,25(S2):72. 16 Nurhayat Degirmenci, Arin Yilmaz. Use of diatomite as partial replacement for Portland cement in cement mortars[J]. Construction and Building Materials,2009,23: 284. 17 Wu Linmei, Nima Farzadnia, Shi Caijun, et al. Autogenous shrin-kage of high performance concrete: A review[J]. Construction and Building Materials,2017,149:62. 18 Chen Z Y, Cui J H, Zhu J Q, et al. Analysis and control of crac-king in reinforced control[J]. Engineering Mechanics,2006,23(a01):86(in Chinese). 陈肇元,崔京浩,朱金铨,等.钢筋混凝土裂缝机理与控制措施[J].工程力学,2006,23(增刊Ⅰ):86.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2018, Vol. 32 
