Synthesis and Microstructure Analysis of Autoclaved Aerated Concrete with Carbide Slag Addition
Synthesis and Microstructure Analysis of Autoclaved Aerated Concrete with Carbide Slag Addition
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电石渣蒸压加气混凝土的合成及微观结构分析
DOI：
10.1007/s11595-014-1034-0
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发表时间：
2014-10-01
影响因子：
1.6
通讯作者：
Jing Yani
中科院分区：
文献类型：
--
作者：
Fan Junjie;Cao Deguang;Jing Yani
以电石渣为主要原料合成了压蒸加气混凝土（AAC），其抗压强度约为2 MPa，密度小于g.cm（-3）。在本研究中，石英砂作为骨架结构相在基体中起作用，石英的加入也影响了原料的Si/Ca。在62%时，很容易形成雪硅钙石和CSH凝胶，这似乎提高了样品的抗压强度。固化时间似乎影响所产生的相的形态，并且在10 h时形成板状雪硅钙石的试样似乎比在18 h时形成纤维状的试样具有更好的抗压强度发展。较高的养护温度似乎有利于雪硅钙石和CSH凝胶的形成，这也对样品的强度发展产生了显着的影响。微观上，CSH凝胶填充于基体界面，雪硅钙石生长于孔隙内表面。雪硅钙石或/和CSH的形成似乎使基质致密化，因此提高了样品的强度。
Synthesis of autoclaved aerated concrete (AAC) has been carried out with carbide slag addition, and the carbide slag could be used as a main material to produce the AAC with the compressive strength about 2 MPa and the density below 0.6 g.cm(-3). In this study, quartz sand acted as frame structure phase in the matrix, and quartz addition also influenced the Si/Ca of starting material. Tobermorite and CSH gel were formed readily at 62%, which seemed to enhance the compressive strength of samples. Curing time seemed to affect the morphology of phase produced, and specimen with the plate-like tobermorite formed at 10 h appeared to have a better compressive strength development than the fiber-like one at 18 h. The higher curing temperature seemed to favor the tobermorite and CSH gel formation, which also exerted a significant effect on the strength development of the samples. On the micro-scale, the formed CSH gel was filled in the interface of the matrix, and the tobermorite appeared to grow in internal-surface of the pores and interstices. The tobermorite or/and CSH formation seemed to densify the matrix, and therefore enhanced the strength of the samples.