| Summary: | 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
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