Investigation the Repairing Efficiency of Cracked Concrete by Epoxy-Injection Method

• Main Authors: Kuo-Jung Wang, 王國榮
• Other Authors: Der-her Lee
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/28893619233866712540

碩士 === 國立成功大學 === 土木工程學系專班 === 95 === The thesis is to explore how the properties of concrete are changed by repetitive circulation of sea water, fresh water and wet and dry air, which is simulated in the laboratory. After cracks are found in the concrete, this concrete is repaired by means of low pressure epoxy-injection method. Next, the repaired concrete is put through as the above curing condition ,to study the efficiency of this repairing method and to make a series experiments, and to find the reciprocal relative curve by means of regression method, for the reference of future design and construction of projector. The experiment result shows that (1) if the target strength is fcr =210kg/cm2 and fcr =280kg/cm2, concrete before and after repairing, its Elasticity Modulus,Dynamic Elasticity Modulus,Dynamic Shear Stress Modulus, Compression Stress Velocity,Shear Stress Velocity increase with the square root of Compression Stress. Among them,still concrete curing in the sea water is the largest strength in the early and late period, and the ascendant trend is most obvious.(2)concrete, fcr =210kg/cm2 ,before and after repairing , we can measure Ed（Dynamic Elasticity）of its concrete cylinder after 28days’ curing, approximately equal to 1.29~1.90Es and 1.29~1.89Es, the rate between Es( Elasticity Modulus) and Ed ( Dynamic Elasticity Modulus) after 28days’ curing is 44.8%~94.3% and 47.6%~85%.(3)concrete, fcr =280kg/cm2 ,before and after repairing , we can measure Ed(Dynamic Elasticity)of its concrete cylinder after 28days’ curing, approximately equal to 1.11~1.29Es and 1.16~1.22Es, the rate between Es( Elasticity Modulus) and Ed ( Dynamic Elasticity Modulus) after 28days’ curing is 70.3%~90.1% and 77.2%~88.6%.(4)repairing efficiency assessments: concrete, fcr =280kg/cm2 the repairing indexis 0.76~1.34.(5)among the curing condition of AW,SS,AS,AA,SA,WA and WW, the carbonization of AW,AA ,SS are the harsher, SS is the harshest and its burnt calcium carbonate loss is as high as 9.2%.