Papers by Author: Jia Chong Du

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Authors: Jia Chong Du, Kai Chueh Chang
Abstract: Temperature grows up and climate changes year by year as result of global warming. One of the main reasons is the carbon dioxide emission. How to overcome global warming effect by means of energy conservation and carbon reduction is one of the important subjects and one of government's important administrative policies. Nowadays, the price of the international crude oil raised causes the price of the asphalt and ignition oil going up. Warm mix asphalt (WMA), a new-type mix asphalt technology, which has the characteristics of environmental protection, energy conservation and good workability is from Europe. Compared with Hot mix asphalt (HMA), the properties of the WMA is same as the HMA. Thus, the technology of WMA with emulsion asphalt mixture under energy conservation, carbon reduction, and cost reducing by way of temperature control, is introduced by this study in order to change the traditional HMA. The study used dense-graded aggregate with three nominal maximum aggregate sizes (NMAS) of 9.5mm, 12.5mm and 19mm is tested by indirect tensile strength, moisture sensitivity and permanent deformation test for evaluation and the results will be for reference of the HMA mix plant factories.
Authors: Jia Chong Du
Abstract: Pavement bonding associates with shear strength which depends on different tack coat materials and temperature. The higher temperature has, the lower shear strength is; and increasing the application rate does not significantly improve the shear strength. The test results show that the shear strength decreases with an increase in temperatures has the maximum value at optimum application rate (OAR) and emulsion asphalt used has higher shear strength than that of cutback asphalt. The tack materials and temperature are significantly effective the shear strength, in accordance with the statistic of two-way analysis of variance (ANOVA) test.
Authors: Jia Chong Du, Wan Chien Hung
Abstract: Based on cost effectiveness, environmental impact, energy savings, and shortages of quality materials, reclaimed asphalt pavement (RAP) used for pavement construction does not only reduce aggregate need, but it also solves the problem of RAP disposal. Thus, the technology of cold mix recycling for pavement sub-base and base is introduced and tested in laboratory. The test results show that the recycled cold mix is a candidate material for pavement sub-base and base layer use. However, cold-mix emulsion asphalt used for recycling must be designed properly to ensure reliable performance. The unique features of recycled cold mixes are time temperature effects.
Authors: Ming Feng Kuo, Cheng Tsung Lu, Jia Chong Du, Yu Kai Chen
Abstract: The Cement-Asphalt Mastic (CAM) is combined with emulsified asphalt and cement. It can mix at room temperature manufacturing and construction without heating. This study investigated viscosity, slump, setting time and segregation of fresh Cement-Asphalt Mastic (CAM). These properties help control the quality of Cement-Asphalt Concrete (CAC). Viscosity and slump are associated with CAC workability and segregation of mastic is related to that quality of fresh CAC. Analytical results of these property tests establish an applicable range for cement and emulsified asphalt (C/A) in CAM at 1-1.2. The applicable range for F-type Superplasticizer (FSP) and emulsified asphalt (FSP/A) is 0.03-0.05.
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