文章摘要
唐欣薇,何奇滨,周元德,张楚汉.高致密增韧水工混凝土的制备及其性能研究[J].水利学报,2018,49(12):1523-1531
高致密增韧水工混凝土的制备及其性能研究
Study on preparation of high dense and toughened hydraulic concrete and its properties
投稿时间:2018-06-08  
DOI:10.13243/j.cnki.slxb.20180540
中文关键词: 水工混凝土  高致密  增韧  材料制备  性能测试
英文关键词: hydraulic concrete  high dense  toughened  preparation  performance test
基金项目:国家自然科学基金委员会-中国铁路总公司高速铁路基础研究联合基金项目(U1434211);水沙科学与水利水电工程国家重点实验室开放基金项目(sklhse-2017-C-03);华南理工大学中央高校基本科研业务费重点项目(2017ZD019)
作者单位
唐欣薇 华南理工大学 土木与交通学院, 广东 广州 510640
清华大学 水沙科学与水利水电工程国家重点实验, 北京 100084 
何奇滨 华南理工大学 土木与交通学院, 广东 广州 510640 
周元德 清华大学 水沙科学与水利水电工程国家重点实验, 北京 100084 
张楚汉 清华大学 水沙科学与水利水电工程国家重点实验, 北京 100084 
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中文摘要:
      为使所制备的材料具有良好的体积稳定性和抗渗透能力,对基胶凝材料进行微观性能分析,选择性能适宜的化学外加剂进行浆体的流变性能设计。考察了外加剂的分散作用、引气作用、调凝作用和养护制度对浆体填充能力和凝结速率的影响,并采用颗粒堆积算法,调节和优化了浆体的颗粒堆积与流动能力之间的关系。通过掺入微细钢纤维,提高了混凝土的韧性,抑制混凝土的收缩变形。同时,开展系列室内试验对制备的高致密增韧水工混凝土材料进行力学性能、耐久性及体积稳定性研究。试验结果显示:高致密增韧水工混凝土的抗压强度及劈裂抗拉强度分别可达109.66和17.60 MPa。其通电6 h的电通量不超过130 C,28 d碳化深度不超过2 mm,冻融质量损失率不超过0.2%,强度损失率不超过2%,42 d干缩变形量不超过0.17‰。高致密增韧水工混凝土表现出良好的力学性能、优异的耐久性及体积稳定性。
英文摘要:
      Aiming to obtain the concrete with satisfactory volume stability and anti-permeability, the mi-cro-performance of cement-based materials were analyzed to design the rheological property of slurry by mixing appropriate chemical admixtures. The effect of the dispersion, air entrainment, coagulation of chemi-cal admixtures and curing system on filling capacity of slurry and rate of setting were investigated to opti-mize the particle packing and workability of slurry by particle accumulation algorithm. The toughness and shrinkage strain were improved by adding steel fiber. Meanwhile, a series of experimental tests were car-ried out to estimate the basic mechanical characteristic, durability and volume stability on the high-dense and toughened hydraulic concrete(HDTHC). The results show that the compressive strength and splitting ten-sile strength of HDTHC reached 109.66MPa and 17.60MPa respectively. Its electric flux of 6h was not ex-ceeding 130C, the carbonation depth of 28d was 2mm, the loss rate of freeze-thaw quality was no more than 0.2%, the strength loss rate was no more than 2%, as well as the dry shrinkage deformation of 42d was no more than 0.17‰. HDTHC showed good mechanical properties, excellent durability and volume sta-bility.
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