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Analysis for Causes of Cracking in the Concrete Structure and Strengthening Technology

Author: QuCheng
Tutor: WangQingXiang
School: Dalian University of Technology
Course: Civil Engineering
Keywords: Coagulation on the structure Crack Reinforcement
CLC: TU746.3
Type: Master's thesis
Year: 2002
Downloads: 378
Quote: 5
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Abstract


Concrete cracking problem has been a hot research field , concrete cracking problems in recent years, especially in the early attention. Cracking of concrete can be divided into load and deformation caused by two, and which accounts for over 80% of cracking is an urgent need to solve the problem . Free shrinkage values ??can not be directly used to evaluate the performance of concrete cracking , the test must be carried out under the constraints . While abroad in the constrained test method has made progress in many aspects , in accordance with article flat , ring and uniaxial type classification method has conducted some systematic summary . Comprehensive Test results show that the performance of cementitious systems cracking concrete cracking performance with good correlation and to avoid interference with the composition of the concrete complex . Ring device is established based on evaluation criteria cracking time , for some trials found that different cement products cement crack resistance varies greatly. This gelling system of pure Portland cement crack resistance were studied, tested simultaneously investigated fly ash , slag, silica fume and admixtures for cementitious system early cracking performance. Based on the reinforced concrete structure of the basic material in the stress - strain relationship and ultimate deformation values ??for the two parts of the old and new structural reinforcement stress, strain poor application of the principle of superposition , derived reinforced structures at different stress state capacity and force applied calculation method , pointed out , \This article Cracks in concrete structures , reinforcement calculations are analyzed and research, the calculation of reinforced concrete structure , reinforced technical methods for engineering application reference.

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