| Summary: | 碩士 === 雲林科技大學 === 營建工程系碩士班 === 99 === Taiwan, located in the Pacific region, where the temperature is always high and humid, belongs to sea-island climate. Compared to the region of continental climate, the environment in Taiwan is even harder for concrete structures. Besides, because of the highly industrialized world, the environment is full of acid rain formed by hazardous substances such as CO2 and sulfide, making the structures easier eroded. As a result, the preservation of structure ends in unceasing repair. This research use “Controlled Permeability Formwork (CPF)” on structures to lower the erosion from hazardous substances.
This research aims to find out the effect of Self-Compacting Concrete (SCC) by the use of CPF, the effect of hardened properties in water-cement ratio and ages. The testing items include measuring the surface void, water content of SCC, compressive strength test, pull strength of SCC surface, permeability test, the amount of chloride ion penetration test and so on.
Test results showed that CPF can lower the water content of SCC 26-34 % than without. It is better to use different types of CPF to CPF 1. Using CPF can increase pullout surface strength about 18-20% of SCC. Better strength to pull the surface of W/B=0.38 shows that about 20% of the different W/C to enhance the surface drawing strength in different CPF. Better use of type to CPF 1, compressive strength of the W/B=0.38 shows that increase strength of about 5-9% in different ages. The increasing effect of CPF1 for compressive strength is optimal at W/B=0.50. With W/B=0.38 shows that CPF1 can reduce the permeability of SCC about 32-41% in different ages. The chloride ion content of SCC in W/B=0.38 was decrease 11-21% by the using of CPF1.The surface void of SCC at W/B=0.38 presented by the void less CPF 1 than others. In conclusion, the effect of CPF is better on lower W/C, and the use of CPF used in new types of better, CPF on the economic benefits to reduce future maintenance costs.
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