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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 20 Abstracts search results
November 1, 2020
March 1, 2020
Kai Jiao, Chen Chen, Lei Li, Xun Shi, and Yong Wang
To promote the application of pervious concrete (PC) in heavy-duty pavement engineering, a thick plate (approximately 50 to 100 cm) paving structure can be used, and its failure form mainly by fatigue compression. Therefore, compressive fatigue tests were carried out under fatigue loads in four stress levels (S): 0.6, 0.7, 0.8, and 0.9, at three loading frequencies of 10, 15, and 20 Hz. The results showed that the fatigue life (N) and fatigue residual strength are controlled by S, while loading frequency showed no statistically significant effect on them. The fatigue failure of PC will not occur under a stress level of 0.6. The survival rate of PC and the fatigue life of uniaxial compression obey a Weibull distribution with two parameters. The material constants of uniaxial compression fatigue of PC are 0.0464 to 0.052, which are similar to ordinary concrete. There are two forms of fatigue failure: one is the shearing along the vertical central axis and the other is shear failure at an angle of 15 to 30 degrees with the vertical central axis.
May 1, 2018
Gang Xu and Xianming Shi
An environmentally friendly pervious concrete was developed by using fly ash as the sole binder modified by graphene oxide (GO). The density, void ratio, mechanical strength, Young’s modulus, infiltration rate, deicer salt scaling, and degradation resistance of this pervious concrete were measured against three control groups. The test results indicated that the addition of 0.02% GO (by weight of fly ash) significantly increased compressive strength, split tensile strength, Young’s modulus, deicer salt scaling resistance, and degradation resistance of the fly ash pervious concrete. Overall, this innovative fly ash pervious concrete showed a comparable performance to portland cement pervious concrete. A microscopic investigation using an electron microprobe was also conducted to obtain more insights on the effects of GO and chemical activators on the fly ash pervious concrete.
March 1, 2017
Somayeh Nassiri and Benjamin Nantasai
Thermal conductivity (K) of pervious concrete specimens was measured using the heat-flow meter and the thermal needle probe methods. The two test methods were first conducted on 285.75 mm (11.25 in.) dry square slabs with varying porosities (φ) from 19 to 36%. Strong linear K-φ relationships were obtained based on both methods. On average, K for the slabs was 0.50 W/(mK) using the heat-flow meter, and 0.62 W/(mK) by the needle probe. Using the needle probe, 4% water in the slabs resulted in a 20% increase in K. One-hundred millimeter (4 in.) diameter cylinders were saw cut in half and were tested for K at the top and bottom. K-φ were obtained for the cylinder halves using the needle probe. The mean geometric model showed a near-perfect fit for the slabs in dry conditions. The model fit reasonably well to the top cylinders’ K and overestimated K for bottom cylinders with a mean square error of 0.012 W/(mK).
September 1, 2015
Ian Anderson and Mandar M. Dewoolkar
This laboratory study investigated the durability of pervious
concrete containing fly ash to freezing and thawing and salt exposure in a field-representative environment. Pervious concrete was prepared by replacing cement with 0, 10, 20, and 30% fly ash. The specimens were subjected to one slow freezing-and-thawing cycle per day up to 100 days in a drained condition with sodium chloride solution with concentrations of 0, 2, 4, 8, and 12%. The void content, compressive strength, and hydraulic conductivity of the mixtures were all within the range of typical pervious concrete applications. Freezing-and-thawing testing suggested that for all concentrations of salt solution, 10 and 20% fly ash replacement improved freezing-and-thawing durability. Specimens with 30% fly ash showed more damage than that of the 0% control. The greatest damage from salt solutions was seen in 8%, 4%, and 2% concentrations,
respectively. Water and 12% salt solution showed little damage across all mixture designs.
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