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Study on the Origin of Concretes Crack and Prevention Measure in Railway Engineering

Author: YuYang
Tutor: LiGuoZhong
School: Jinan University
Course: Materials Processing Engineering
Keywords: Concrete cracks Alkali-aggregate reaction Polymer modified cement grouting material Polymer modified cementitious repair mortar
CLC: U215
Type: Master's thesis
Year: 2010
Downloads: 71
Quote: 0
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Abstract


Cracks in concrete railway engineering incidence of \In China, the research on the causes and prevention measures of concrete cracks in railway engineering is at a preliminary stage, some practical engineering applications to obtain good results, but mostly to learn from foreign experience. This topic is precisely carried out in this context. Explore the formation mechanism through the study of the causes of concrete cracks in railway engineering; study inhibition and repair cracks in concrete measures. Analysis the concrete cracks Status Railway Engineering the subject through the full investigation, conducted in-depth discussion on the causes of concrete cracks in railway engineering, focusing on research by the alkali-aggregate reaction (Alkali-Aggregate Reaction, referred to as the AAR) trigger mechanism of crack formation causes and hazards to explore the methods and measures of comprehensive prevention and suppression of the alkali-aggregate reaction. In this paper, the accelerated mortar bar test method, by the determination provisions age period (14d) of the expansion rate, the inhibitory effect of mineral admixture and inorganic admixtures alkali-aggregate reaction; combined with scanning electron microscopy (SEM) test means its microscopic mechanism analysis. The results showed that the right amount of mixing the AAR with sample mineral admixture and inorganic admixtures are better able to swell, and the incorporation of the greater role of the more obvious effects. More appropriate to take into account a combination of factors, 25% of fly ash, silica fume content is 20%, the lithium salt inhibitor dosage is 0.1%, polypropylene fiber content of 0.6 kg / m ~ 3 . The subject by a large number of experimental studies and theoretical analysis to solve the existing problems in the the VAE emulsion modified cement-based materials. With fast hard sulfur aluminate cement, VAE emulsion and other admixtures to the preparation of grouting material. In the different poly ash than the conditions under, comprehensive system to study the viscosity of a polymer modified cement grout material groutability, setting time, mechanical properties, adhesive properties, contractile properties, water resistance, polymer modified cement grouting material microstructure analysis of the mechanism of polymer modified cement grouting material. Compare test results, and ultimately determine the optimum mixture ratio of the various types of materials. The results show that the performance of polymer modified cement grouting material can meet the requirements of practical engineering and polymer modified cement grouting material of the original structure was not alone play a waterproof plugging seepage also played to the reinforcement of the original disease of a building structure, the recovery effect. The cement grouting compound polymer emulsion The optimum content is 10% and 15% for polymer dosage of 10% of a sample, repeat the test of the admixture content, the results are consistent with the dosage of 15% emulsion, The admixtures best dosage of superplasticizer 0.7%, respectively, defoamer 0.5%. The subjects also developed a VAE emulsion modified polymer modified cementitious repair mortar. Comprehensive and systematic study of the process performance polymer modified cementitious repair mortar, mechanical properties, adhesive properties, shrinkage performance, waterproof performance, microstructure and porosity of polymer modified cementitious repair mortar, proven the mechanism of polymer modified cement grouting material. The results show that its performance can meet the requirements of practical engineering and good interfacial bonding patch. The optimum dosage of the polymer emulsion in the polymer-modified cement repair mortar for 10%, the admixture optimum content of superplasticizer 0.7%, defoamers 0.5% retarder 1.5%.

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CLC: > Transportation > Rail transport > Railway Line Project > Line construction
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