Author
Hao Wu
Other affiliations: University of Tennessee
Bio: Hao Wu is an academic researcher from Central South University. The author has contributed to research in topics: Portland cement & Pervious concrete. The author has an hindex of 15, co-authored 34 publications receiving 914 citations. Previous affiliations of Hao Wu include University of Tennessee.
Papers
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TL;DR: In this article, the authors focused on the balance between permeability and strength properties of polymer-modified pervious concrete (PMPC) mixtures, which included natural sand and fiber to enhance the strength properties.
332 citations
TL;DR: In this paper, the performance of laboratory and field produced pervious concrete mixtures as well as field cores were evaluated and compared through laboratory performance tests, including air voids, permeability, compressive and split tensile strengths, and freeze-thaw durability tests.
133 citations
TL;DR: In this article, the performance of pervious concrete with a particular focus on abrasion resistance was evaluated using laboratory tests and the results showed that adding latex desirably improved the strength and abrasation resistance of PCPC, whereas fiber did not show a significant effect on the mechanical properties.
Abstract: High porosity with interconnected voids between aggregate particles is the primary characteristic of portland cement pervious concrete (PCPC), which, however, causes a significant decrease in its strength and abrasion resistance. In this study, latex and fiber were added to improve the abrasion resistance of PCPC mixtures. Laboratory tests were conducted to evaluate the performance of latex-modified pervious concrete with a particular focus on abrasion resistance. Test results show that adding latex desirably improved strength and abrasion resistance of PCPC, whereas fiber did not show a significant effect on the mechanical properties of PCPC. In addition, the asphalt pavement analyzer (APA) abrasion test was found to be feasible for evaluating the abrasion resistance of pervious concrete.
99 citations
TL;DR: In this article, the performance of Portland cement pervious concrete (PCPC) with a particular focus on freeze-thaw durability was evaluated and the results showed that even with high porosities, a proper content of air-entraining agent (AEA) added in the PCPC mixture could still improve its strength and increase its freeze-thyaw durability.
91 citations
TL;DR: In this article, three laboratory abrasion test methods were investigated for their potential capability of evaluating the caustic and raveling resistance of Portland cement pervious concrete (PCPC) mixtures.
Abstract: Portland cement pervious concrete (PCPC) has been increasingly used in concrete pavements during recent years. In addition to strength and permeability, abrasion durability is another important property of PCPC. In this study, three laboratory abrasion test methods were investigated for their potential capability of evaluating the abrasion and raveling resistance of PCPC. The three tests are the Cantabro test, the loaded wheel abrasion test, and the surface abrasion test. To evaluate the three test methods, eight PCPC mixtures containing different sizes of coarse aggregates and additives were tested. The comparison of the three abrasion tests indicates that all three tests were fairly effective in differentiating between the PCPC mixtures. However, the results from the Cantabro test may not reflect the abrasion resistance of the mixtures because the failure of the specimens was caused by impact rather than abrasion. With studded wheels and increased wheel load, the loaded wheel abrasion test exhibited best sensitivity and sufficient repeatability. The surface abrasion test successfully differentiated the control mix from other mixtures, but failed to differentiate between the mixtures containing latex and/or fiber, which may be attributed to the unfavorably low weight loss values from this test.
74 citations
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TL;DR: In this article, the authors developed a mathematical model to characterize the relationship between compressive strength and porosity for porous concrete by analyzing empirical results and theoretical derivations, which was derived from Griffith's theory.
402 citations
TL;DR: In this paper, the use of pervious concrete as a pavement material in low-volume road applications has gained importance due to its positive environmental aspects, which will make it a promising sustainable roadway material in future.
246 citations
01 Jan 2014
TL;DR: In this paper, 100% recycled hot mix asphalt lab samples were modified with five generic and one proprietary rejuvenators at 12% dose and tested for binder and mixture properties, which ensured excellent rutting resistance while providing longer fatigue life compared to virgin mixtures and most lowered critical cracking temperature.
Abstract: 100% recycled hot mix asphalt lab samples were modified with five generic and one proprietary rejuvenators at 12% dose and tested for binder and mixture properties. Waste Vegetable Oil, Waste Vegetable Grease, Organic Oil, Distilled Tall Oil, and Aromatic Extract reduced the Superpave performance grade (PG) from 94–12 of extracted binder to PG 64-22 while waste engine oil required higher dose. All products ensured excellent rutting resistance while providing longer fatigue life when compared to virgin mixtures and most lowered critical cracking temperature. Rejuvenated samples required more compaction energy compared to virgin and some oils reduced moisture resistance slightly.
214 citations
TL;DR: In this article, the influence of aggregate type and size on the properties of pervious concrete was investigated and it was found that a higher amount of small aggregate fractions yielded higher density concrete mixtures and greater flexural strength.
201 citations
TL;DR: In this paper, a reduction in pore water pressure is proposed to improve the stability of slopes. Deep draining trenches can be used for this purpose, and they can be found in many places in the world.
Abstract: Reduction in pore water pressure is a useful strategy to improve the stability of slopes. Deep draining trenches can be used for this purpose. For the realization of deep trenches, the usua...
190 citations