The Strength and Elastic Modulus of Pervious Concrete Considering Pore and Fiber during Freeze–Thaw Cycles

Yi Wu (), Jun Dai, Bailei Shi and Bingquan Wu
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Yi Wu: School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Jun Dai: School of Architecture and Civil Engineering, Xi’an University of Science and Technology, Xi’an 710054, China
Bailei Shi: School of Mechanics and Civil Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Bingquan Wu: College of Geological Engineering and Geomatics, Chang’an University, Xi’an 710064, China

Sustainability, 2022, vol. 14, issue 23, 1-13

Abstract: The interface between aggregate and cement matrix and the strength of the cementation layer between aggregates are the key factors affecting the strength of pervious concrete. The purpose of this paper is to evaluate the effects of porosity, compressive strength and elastic modulus of pervious concrete before and after freeze–thaw cycles. The effective porosity and total porosity were obtained by the underwater weighing and CT (computed tomography) image analysis methods. Uniaxial and triaxle compression tests were carried out to obtain the strength and elastic modulus of pervious concrete considering pore and fiber. The results indicated that the effective modulus and effective stress were closely related to the porosity, and the continuous fracture of cementation points between aggregates caused damage to pervious concrete. Inclined shear failure of pervious concrete occurred under uniaxial pressure, and the strength and elastic modulus increased with increases in confining pressure. With the increase in freeze–thaw cycles, the porosity increased linearly, the strength and elastic modulus decreased and a mutational point appeared between 40 and 50 times during the freeze–thaw cycles. The fiber enhanced the strength of the cementation layer and increased the connection between aggregates, thus improving the strength and integrity of pervious concrete. This work is needed to serve as a reference for the fracture mechanism of pervious concrete and the effect of freeze–thaw cycles considering pore and fiber.

Keywords: pervious concrete; freeze-thaw cycles; elastic modulus; cementation layer; effective stress (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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