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Construction Technique Study on Mass Concrete of Raft Foundation

Author: YangLin
Tutor: ZhaoJun
School: Zhengzhou University
Course: Architecture and Civil Engineering
Keywords: Raft foundation mass concrete construction technique temperature control
CLC: TU755
Type: Master's thesis
Year: 2013
Downloads: 50
Quote: 0
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Abstract


Nowadays, as the engineering construction scale of our country becoming larger, high-rise building has been of prime importance to civil engineering. Raft foundation is a common foundation structure of high-rise building, which belongs to mass concrete structure as the thickness of plating is large. Due to the great importance of raft foundation in high-rise building and the changes in foundation which is deeper and longer, mass concrete construction of raft foundation comes to a research focus.The crack controlling is the key research direction of the mass concrete of raft foundation, and this paper makes a specific research on certain aspects below:1. Analyzing the main features, causes and control methods of mass concrete of raft foundation based on the construction. The cracks of raft foundation are mainly surface cracks, which mainly because the temperature and contraction deformations in construction period are very large. Preventive measures of the cracks have two aspects, including reducing the heat of hydration of cement and improving the anti-cracking ability of mass concrete.2. The temperature crack in mass concrete of raft foundation is calculated. Make a systematic calculation of temperature crack based on the project cases, and provide relevant conservation measures to guide the construction of mass concrete.3. The mass concrete construction organization, scheme and technique of raft foundation are discussed, focusing on the temperature-control methods, pouring methods, curing methods of mass concrete and temperature monitoring. In this chapter, the construction of post-grouting belts, secondary vibration technology and temperature detection are emphasized. Then regarding the project conditions, the relevant construction technique is chosen to make the construction more efficient and successful.4. The QC of mass concrete construction of raft foundation. The main factors influencing the quality of mass concrete and prevention measures of common quality defects in construction are analyzed. The main technique measures for safeguard construction quality of mass concrete are summarized.

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CLC: > Industrial Technology > Building Science > Construction > The project and the type of work > Concrete and reinforced concrete works
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