The climate change has been rising the sea level triggering extreme weather events such as floods and hurricanes also changing the precipitation pattern Precipitation can change the moisture levels in pavement by accumulate uncontrolled surface runoff on pavement and fulfill the drainage Permeable pavement (also known as pervious concrete) is one of the solutions for mitigating the stormwater runoff Pervious concrete (PC) has been commonly used in low strength material infrastructure This offers the potential for waste material such as oxidative slag (OS) or bottom ash (BA) to be reused in PC Nonetheless the issue of using OS as an aggregate was the potential of swelling due to free CaO or Mgo On the other hand the potential swelling of OS might be solved due to the porous structure of PC Along with the water reacts with free CaO it generates the expansive compound (calcium hydroxide) which is the important compound in the pozzolanic reaction of concrete FA and BA are known to enhance the long-term performance of PCC due to its pozzolanic property However little to no studies have investigated the performance of cementitious concrete incorporating OS and BA as rich pozzolanic material The main objective of this study was to investigate the usage of OS and BA in the PC as a replacement of fine and coarse aggregate in the mix The study was investigated mixed performance including engineering properties thermal performance and self-healing ability with various OS and BA usage scenarios Four groups of PC mixes with various cement FA BA and OS was used to develop 13 different types of PC mixes Firstly the average results of 7-day and 28-day compressive strength PC-BAOS mixes were 19 83% and 18 77% which lower than that of PC-BARG mixes It was caused due to the swelling of OS Even though in the latest age of PC-BAOS increment of compressive strength 28-day up to 90-day was 11 5% which is the highest among the PC’s mixes Secondly the peak surface temperature of PC-BAOS1 and PC-NSOS1 were reached around 66?C during the dry heating cycle as the highest among all mixes it was caused due to the high heat capacity and low conductivity Lastly For the self-healing performance the PC-BAOS1 mix has the greatest crack closing ratio of 59% and has the highest compressive strength recovery (CSR) of 69 7% among all other mix types Finally the PC incorporating OS and BA as aggregate performs slightly better in terms of functional and equal to the engineering properties than conventional PC Meanwhile the conventional PC has better performance in terms of thermal properties In addition the PC containing OS and BA has more advantages on the self-healing ability
Date of Award | 2021 |
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Original language | English |
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Supervisor | Shih-Hsien Yang (Supervisor) |
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Investigation on Engineering and Thermal Properties of Self-healing Pervious Concrete Utilizing Oxidative Slag and Coal Bottom Ash
拉, ?. (Author). 2021
Student thesis: Doctoral Thesis