Durability Study on Roof Concrete WithWaterproof and Heat Insulation Materials inDifferent Temperature Environments

• Main Authors: Kuo. Ling Yin, 郭玲吟
• Other Authors: 卓世偉 博士
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/61962912332955378096

碩士 === 中華科技大學 === 建築工程與環境設計研究所在職專班 === 102 === This study is conducted on materials that are commonly used in floor layers to observe the temperature differences after the floor layers are exposed to the sun outdoors. Meanwhile, the mechanical properties of the floor layers are analyzed and the Accelerated Chloride Migration Test (ACMT) is conducted to observe the transport properties of the chloride ions at different ambient temperatures. The waterproof materials used in floor layers include polyurethane (PU) waterproof coating materials, and acrylic (acrylic acid esters) rubber waterproof coating materials. Thermal insulation materials include foam concrete, poly-foam heat-shield-bricks, and polystyrene boards. Those materials are combined to create 15 experimental control groups using the USD (Upside Down Roofing Systems) and the BUR (Built-up Roofing Systems). In this study, the experiment applies the waterproof and thermal insulation materials for floor layers on the 5cm thick 4000psi concrete, and place the concrete outside exposed to the sun. The temperature is measured and the mechanical properties of the concrete such as the compressive strength are analyzed with the thermocouple buried 1 cm below the surface of the concrete. Then, during the Accelerated Chloride Migration Test (ACMT), the concrete after conserved in water for 28 days, is placed in the oven (at temperatures of 50℃ and 75℃) to evaluate the concrete’s ability to resist chloride ions at different ambient temperatures. As shown by the test results, when there is no waterproof and thermal insulation materials, the measured temperature is as high as 63℃. Comparing the USD and the BUR, the USD exhibits better thermal insulation effects than the BUR. Among the thermal insulation systems, the foam concrete system is the best as the complex interior structures containing solids, bubbles, pores, and pressurized cement mortar on the top to absorb the heat. The thermal insulation layer exhibits a considerable heat insulation effect. After the waterproof and thermal insulation materials have deteriorated, we find that the compressive strength coefficients of the concrete specimens have at least decreased by 5% under different conditions, which shows no significant differences in the compressive strengths. After deterioration at high temperatures, all of the transmission rates in the ACMT for each group increases, possibly because the temperature creates pores and minor cracks in the cement mortar for the transmission of chloride ions, which contributes to temperature deterioration at faster rates. Keywords: waterproof, thermal insulation, concrete floors, resistance to chloride ions