摘要
通过自燃煤矸石骨料压碎值、吸水率、粒径分布测定和混凝土抗压强度试验研究了矸石骨料替代天然骨料及碱性拌合水对喷射混凝土抗压强度的影响,并利用SPSS软件对实验数据进行分析。结果表明:骨料类型对混凝土强度影响不显著;碱性拌合水有助于矸石混凝土3 d、28 d强度的提高,而对1 d及石子混凝土各龄期强度影响不明显。SEM观察和分析表明:矸石疏松多孔、易吸水、粗糙的表面特征有利于水泥砂浆的附着,有效降低了高拌合水量下界面处的水灰比,减少了对强度不利的界面过渡区的厚度;碱性的矿井水有助于激发自燃煤矸石中活性SiO2和Al2O3的溶出,这些活性物质与界面处聚集的Ca(OH)2发生反应产生凝胶,提高了界面过渡区的密实度。
Through experiments on crushing value, water absorption, particle size distribution of spontaneous combustion gangue aggregate, and the compressive strength of concrete, the influence to compressive strength of shotcrete when gangue aggregate replaced natural aggregate and the alkaline mixing water is investigated. The experimental data is analyzed with use of SPSS software, showing that aggregate type has little influence on concrete strength, alkaline mixing water benefits to enhance 3 d and 28 d strength of gangue concrete, but has less impact on 1 d strength of gauge concrete and each age of stone concrete. According to SEM observation and analysis, gangues with feature of loose and porous structure, easy absorption and rough surface is in favor of the attachment of cement mortar, effectively reduces water-cement ratio at the interface under high mixing water and decrease the thickness of the interfacial transition zone that is unfavorable to the concrete strength. Alkaline mine water contributes to dissolve out active SiO2 and Al2O3 in natural aggregate ,and these active substance react with Ca（ OH）2 collected around interface and then produce gel which enhances the density of interfacial transition zone.
出处
《金属矿山》
CAS
北大核心
2014年第2期137-141,共5页
Metal Mine
基金
山东省自然科学基金青年基金项目(编号:ZR2010EQ022)
中国博士后科学基金项目(编号:20100471563)
山东省博士后创新项目(编号:201003008)
山东省大学生学术课题(自然科学类)(编号:13CZR043)
关键词
矸石
混凝土
骨料
界面
强度
Gangue, Concrete, Aggregate, Interface, Strength
