Browsing by Author "Wang, WC"

Filter results by typing the first few letters
Now showing 1 - 2 of 2
  • Thumbnail Image
    item: Conference-Full-text
    Clogging resistance of high strength pervious concrete
    (Springer, 2021) Lee, MG; Wang, YC; Wang, WC; Yatsenko, EA; Wu, SZ; Pasindu, HR; Bandara, S; Mampearachchi, WK; Fwa, TF
    This clogging resistant study includes high strength pervious concrete (HSP) and normal pervious concrete (NSP). The HSP concrete aims to carry out 28- day strength above 42 MPa and porosity as close to 10% as possible to achieve the technical specifications. Some of the key tests were porosity, compressive strength, and permeability test. Experimental simulation of sand and soil clogging tests ofHSP pavement specimens were under evaluation. The test results indicate that the 28-day compressive strength of HSP higher than 42 MPa can be achieved with specific mix design and compaction energy by Proctor tamper, and their porosity ranged from 7.3 to 11.6%. The coefficient of permeability for HSP and NSP concretes meets Taiwan code requirements for structural concrete. The sand and soil clogging results show that all HSP specimens had better maintenance by vacuum sweeping and restored 60–75% of the overall permeability, while the high-pressure washing only improved the permeability by 4–6%. The reason is that the maximum water pressure of the test equipment is seriously insufficient. It is presumed that the pressure washing maintenance caused sand and soil to penetrate into the pores of the HSP specimen. Furthermore, a predictive model of the clogging potential of porous asphalt mixture has been found to fit well to HSP pavement.
  • Thumbnail Image
    item: Conference-Full-text
    Factors affecting the high early strength development and the methods for testing high early compressive strength of the rigid pavement
    (Springer, 2021) Wang, WC; Fang, SL; Chen, TY; Kao, TC; Liu, CC; Li, YY; Duong, HTH; Pasindu, HR; Bandara, S; Mampearachchi, WK; Fwa, TF
    Maintenance highway rigid pavement can cause a significant impact on traffic congestion due to the lack of the traffic lane. Typically, the general maintenance plans are arranged from midnight to early morning before the morning peak traffic periods to mitigate the possibility of traffic congestion. As a result, to open to traffic, the maintenance highway rigid pavement usually requires the concrete to meet a compressive strength requirement of 210 kgf/cm2 after 4–6 h. The high early strength mix design (S-mix design) is examined and published by the Taiwan Freeway Bureau,MOTC. However, this research shows that the S-mix design’s early compressive strength is significantly affected by the exterior temperature. Therefore, it is practically important to control the temperature at the early ages of the concrete. In addition, the maturity method and rebound hammer test results can be used to evaluate high early compressive strength of the construction site. Due to the rigid pavement requires high early compressive strength in a short period of time, taking the specimen to the laboratory to conducting the compressive strength test is challenging. Thus, using the rebound hammer result to simulate the hydraulic compressive testing value is one of the suitable method for evaluating high early compressive strength