大体积混凝土裂缝分析及措施（Analysis and measures of cracks in mass concrete）.docVIP

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大体积混凝土裂缝分析及措施（Analysis and measures of cracks in mass concrete）.doc

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大体积混凝土裂缝分析及措施（Analysis and measures of cracks in mass concrete）

大体积混凝土裂缝分析及措施（Analysis and measures of cracks in mass concrete） Analysis and measures of mass concrete crack Abstract: the concrete is a cementitious material, water, fine aggregate, coarse aggregate, need the incorporation of additives and mineral admixtures in a suitable proportion, after uniform mixing, compaction and curing and artificial stone. In the construction process, often found in concrete structure after forming, the emergence of various cracks. In this paper, the large volume of concrete cracks causes and measures as follows. Keywords: concrete cracks The main causes of 1 concrete cracks There are three main causes of macro cracks in the concrete structure 1.1: 1.1.1 crack caused by external load, it is a most common cause, namely according to the conventional calculation of main stress; 1.1.2 cracks caused by structural stress, which is caused due to differences in the actual working state and calculation model of the structure hypothesis; 1.1.3 crack deformation caused by stress, which is deformed by temperature, shrinkage, swelling, caused by factors such as uneven settlement of the structure, when the deformation constraints will produce stress, when the stress exceeds the tensile strength of concrete crack on the. 1.2 when the concrete structure deformation, the internal structure, between the structure and the structure will be affected each other. Each other, this phenomenon is called constraint. When the cross section of the concrete structure is thick, the internal temperature and humidity distribution in different parts of the internal deformation caused by the mutual constraints, this constraint is called internal constraints; deformation when a structure has been hampered by other structure constraints called external constraints. External constraints can be divided into free body, all constraints and elastic constraints. The deformation of mass concrete structure in the construction of the bear, is mainly caused by temperature and shrinkag