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Study on Freeze-thaw Damage for Concrete Based on Analysis of the Pore Structure

Author: WenJiaBao
Tutor: MaoJiZe
School: Harbin Engineering University
Course: Structural Engineering
Keywords: Concrete Damage Freezing and thawing Pore structure
CLC: TU375
Type: Master's thesis
Year: 2013
Downloads: 85
Quote: 0
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Abstract


In cold regions concrete engineering structure are often subjected to freeze-thaw cyclesand destroyed, freeze-thaw damage of concrete is one of the most representative durabilitydestruction. Changes in the macroscopic properties of the concrete material are mainlyinfluenced by the pore structure of concrete, concrete is a decisive factor in the performanceof its internal pore structure. The study of the concrete pore structure after the cold experiencein freezing and thawing cycles has great theoretical significance and engineering value.Freezing and thawing cycles of severe cold area is one of the main reasons leading to thedegradation of the performance of concrete. Experiencing freezing and thawing cycles willcause the concrete performance degradation, which dues to the damage of internal porestructure of concrete. With the freeze-thaw cycle become increasingly serious internal damageof concrete and eventually cause the destruction of the concrete.Based on the above analysis, this paper conducted experimental work and the resultsachieved:1.This article conducts concrete freeze-thaw cycle test, and analyzes the trends ofrelative dynamic elastic modulus、strength and quality of concrete with changing the numberof the times of the freeze-thaw cycle role.2. Based on concrete damage theory combined and the experimental data, this articleestablish the concrete freezing and thawing regression equation of the relationship betweenthe degree of damage and the number of freeze-thaw cycles.3. In this paper, the pore structure of the concrete after freeze-thaw cycle is carried outin-depth analysis, study the concrete after the freeze-thaw cycle which is carried out infreshwater, freezing and thawing in the seawater of2times, continuing the standard curing,the porosity of the concrete, the total pore volume, the critical pore size, pore size distribution,the most probable pore size and the average aperture variation.

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CLC: > Industrial Technology > Building Science > Building structure > Concrete structure,reinforced concrete structure > Reinforced concrete structures
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