Early-Age Mechanical Characteristics and Microstructure of Concrete Containing Mineral Admixtures under the Environment of Low Humidity and Large Temperature Variation.
Early-Age Mechanical Characteristics and Microstructure of Concrete Containing Mineral Admixtures under the Environment of Low Humidity and Large Temperature Variation.
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低湿大温变环境下矿物掺合料混凝土早龄期力学特性及微观结构
DOI：
10.3390/ma14175085
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发表时间：
2021-09-05
期刊：
影响因子：
--
通讯作者：
Xu H
中科院分区：
文献类型：
--
作者：
Guo J;Zhang Z;Wu J;Wang H;Zhang P;Wang K;Meng Q;Xu H
本研究尝试在西北地区湿度低、温差大的环境中应用矿物掺合料混凝土。利用室内环境试验箱模拟恶劣环境，配制了4种混凝土，包括普通混凝土和3种不同掺量粉煤灰和矿渣的矿物掺合料混凝土。在施工过程中，根据真实的养护条件，将混凝土在环境室内进行养护。研究了28 d前养护早期的抗压强度、断裂性能、SEM图像、气孔特征和X射线衍射特征。结果表明，在低湿度、大温差环境下，粉煤灰和矿渣的掺入能提高混凝土的抗压强度和断裂性能。矿物掺合料的最佳掺量为10%粉煤灰和20%矿渣取代水泥，与普通混凝土相比，其抗压强度、初始断裂韧度、失稳断裂韧度和断裂能分别提高23.9%、25.2%、45.3%和22.6%。通过对混凝土微观结构的分析，粉煤灰和矿渣的掺入可以减弱低湿度、大温差的恶劣环境对混凝土微观结构和水泥水化的负面影响。
The application of concrete containing mineral admixtures was attempted in Northwest China in this study, where the environment has the characteristics of low humidity and large temperature variation. The harsh environment was simulated by using an environmental chamber in the laboratory and four types of concrete were prepared, including ordinary concrete and three kinds of mineral admixture concretes with different contents of fly ash and blast-furnace slag. These concretes were cured in the environmental chamber according to the real curing conditions during construction. The compression strength, fracture properties, SEM images, air-void characteristics, and X-ray diffraction features were researched at the early ages of curing before 28 d. The results showed that the addition of fly ash and slag can improve the compression strength and fracture properties of concrete in the environment of low humidity and large temperature variation. The optimal mixing of mineral admixture was 10% fly ash and 20% slag by replacing the cement in concrete, which can improve the compression strength, initial fracture toughness, unstable fracture toughness, and fracture energy by 23.9%, 25.2%, 45.3%, and 22.6%, respectively, compared to ordinary concrete. Through the analysis of the microstructure of concrete, the addition of fly ash and slag can weaken the negative effects of the harsh environment of low humidity and large temperature variation on concrete microstructure and cement hydration.
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影响因子：
2.2
作者：
Lee, Joo-Ha;Yoon, Young-Soo
通讯作者：
Yoon, Young-Soo
影响因子：
7.4
作者：
Guo, Jinjun;Zhang, Shiwei;Zhang, Peng
通讯作者：
Zhang, Peng
DOI：
10.1016/j.jmrt.2020.04.038
发表时间：
2020-05-01
影响因子：
6.4
作者：
Babalola, O. E.;Awoyera, P. O.;Ovallos-Gazabon, D.
通讯作者：
Ovallos-Gazabon, D.
影响因子：
7.4
作者：
Al-Yousuf, Ayad;Pokharel, Tilak;Sanjayan, Jay
通讯作者：
Sanjayan, Jay
影响因子：
11.4
作者：
Hanehara, S;Tomosawa, F;Hwang, KR
通讯作者：
Hwang, KR