Freezing–thawing durability and its improvement of high strength shrinkage compensation concrete with high volume mineral admixtures
Freezing–thawing durability and its improvement of high strength shrinkage compensation concrete with high volume mineral admixtures
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大掺合料高强补偿收缩混凝土冻融耐久性及其改善
DOI：
10.1016/j.conbuildmat.2012.05.025
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发表时间：
2013-02
影响因子：
7.4
通讯作者：
Sun Wei
中科院分区：
文献类型：
--
作者：
Ma Haiyan;Yu Hongfa;Sun Wei
采用快速冻融法研究了大掺量矿物掺合料补偿收缩混凝土的抗冻融耐久性。研究了三种混凝土，即高强混凝土（HSC）、高强补偿收缩混凝土（HSSCC）和钢纤维高强补偿收缩混凝土（SFRHSCC）。利用X射线衍射仪（XRD）和扫描电子显微镜（SEM）研究了水化产物和微观结构。结果表明，HSSCC的冻融耐久性比HSC低34.2%，其劣化主要表现为AFm-AFt转变引起的膨胀导致的表面裂纹。钢纤维对矿物掺合料的破坏有抑制作用，其冻融寿命比普通高强混凝土提高了33.5%。SFRHSSCC的SEM图像显示，其显微结构主要由致密的CSH凝胶板组成，其中包裹着AFt和AFm晶体。变质以表面结垢为特征，是水压、渗透压和扩张压共同作用的结果，其中AFt的扩张压做出了重要贡献。
Freeze–thaw durability of high volume mineral admixture shrinkage compensation concrete was studied by using accelerated freeze–thaw procedure in this paper. Three types of concrete were investigated, namely High Strength Concrete (HSC), High Strength Shrinkage Compensation Concrete (HSSCC) and Steel Fiber Reinforced High Strength Shrinkage Compensation Concrete (SFRHSSCC). The hydration products and microstructure were investigated by using X-ray diffractometer (XRD) and Scanning electron microscopy (SEM). Results show that freeze–thaw durability of HSSCC is 34.2% shorter than that of HSC, and the deterioration is characterized by the surface cracks induced by the dilation due to the transformation of AFm–AFt. Steel fiber can restrain the damage caused by mineral admixtures, and the freeze–thaw life of SFRHSSCC is prolonged by 33.5% when compared with HSSCC. SEM images of SFRHSSCC show that its microstructure is mainly composed of close-grained CSH gel plank, among which AFt and AFm crystals are wrapped. Deterioration is characterized by surface scaling, which is caused by the combined effect of hydraulic pressure, infiltration pressure and dilation pressure, among which the dilation pressure of AFt makes important contribution.
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DOI：
--
发表时间：
2003
期刊：
Journal of Building Materials
影响因子：
--
作者：
W. Dong
通讯作者：
W. Dong
影响因子：
11.4
作者：
Hu Shuguang;Li Yue
通讯作者：
Hu Shuguang;Li Yue
DOI：
10.14359/20128
发表时间：
2008-03
期刊：
SP-249: Selected Landmark Paper Collection on Concrete Materials Research
影响因子：
--
作者：
T. Powers;R. Helmuth
通讯作者：
T. Powers;R. Helmuth
DOI：
--
发表时间：
1950
期刊：
--
影响因子：
--
作者：
T. Powers;T. Willis
通讯作者：
T. Powers;T. Willis
影响因子：
10.5
作者：
Aïtcin, PC
通讯作者：
Aïtcin, PC