| dc.description.abstract | This study improved the high strength pervious concrete (HSP) mixture of Xiao [32] by adjusting the compaction energy and the dosage of superplasticizer. This HSP aims to carry out 28-day strength above 42 MPa and porosity as close to 15% as possible to achieve the technical specifications. The HSP was tested against normal-strength pervious concrete (NSP) and conventional concrete (CC) samples. Some of the key tests were compressive strength, elastic modulus, splitting tensile strength and abrasion resistance, and proposed the relationship between √f′c with each test. The HSP pavement specimens, whose size was 31×37 cm with the thickness of 10, 15 and 20 cm, were to used measure the sulfuric acid dilution test. Experimental simulation of sand and oil clogging tests of HSP pavement specimens by using L. Chu & T. F. Fwa [4] method were under evaluation.
The test results show that the compaction energy of concrete cylinder 10 diameter x 20 cm reach 40 times, and the dosage of superplasticizer is increased by 10 to 20%, the 28-day compressive strength of HSP will increase from 42 MPa to 53 MPa and porosity will improve from 6.85~7.33% to 8.58~11.64%. Regardless of whether the concrete mixture is improved or not, the modulus of elasticity is about 3795, and the modulus of rupture is about 0.63√f’c. In terms of surface abrasion test, the abrasion resistance of HSP at 28 days is best, which is lower than the average concrete cumulative abrasion rate of 0.5%, and it also shows that the use of larger coarse aggregate in a mix tend to produce concrete of higher abrasion rate. The dilute sulfuric acid test performed best with a 20-cm thick HSP pavement. The pH of the diluted sulfuric acid solution was increased by 6.0 from 1.7, and the hydrogen ion concentration was greatly reduced by 99%. Pervious concrete can promote biodegradation of oil clogging test and due to the fact that measurement method easily floats the oil film out of the surface of specimen, the oil with high fluidity effect only reduces about 9% of the overall permeability. The sand and soil clogging results show that the HSP specimen had better resistance by vacuum sweeping and restored 60~75% of the overall permeability, while the high pressure washing only improved the permeability by 3.9~5.9%. It is presumed that the pressure washing caused sand and soil to penetrate into the pores of HSP specimen.
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