Strength is a crucial performance indicator for evaluating the durability of pervious concrete (PC). However, there are few models for estimating the remaining strength of in-service PC in sulfate and dry-wet cycle circumstances. Even though there are already direct detection methods for strength, nondestructive testing methods are still worth additional research. This paper aims to give a calculation model for the residual strength of PC under corrosion conditions based on ultrasonic methods, which is economical and convenient for engineering applications. The apparent morphological, compressive strength, and ultrasonic velocity of PC against sulfate and dry-wet cycle attack were examined. The results highlight that the primary cause of the macroscopic mechanical deterioration is the worsening in interface strength. Furthermore, the compressive strength and ultrasonic wave velocity of PC followed the same trends during sulfate and dry-wet cycles, increasing first and subsequently decreasing. Additionally, using the curve-fitting approach, an empirical model of strength deterioration based on ultrasonic velocity was developed and validated utilizing experimental data, demonstrating that the proposed model could more accurately define the strength progression. The results can provide an effective calculation method for monitoring the residual strength of PC pavement engineering in a corrosive environment.
Elastic modulus affects the stiffness of pervious concrete, and stiffness is one of the elements restricting the durability of pervious concrete. To explore the deterioration of dynamic elastic modulus of pervious concrete under sulfate attack, this paper measured the variation of pervious concrete’s mass and density with water-cement ratio of 0.28, 0.31, and 0.34 under sulfate attack. A nondestructive ultrasonic tests were also used to determine the change of the ultrasonic wave velocity reflected from pervious concrete. In addtion, the evolution of the dynamic elastic modulus were analyzed. The results show that the pervious concrete manifests an upward curve followed by a downward movement in its density and dynamic elastic modulus as the corrosion lasting. The pervious concrete with a 0.28 water-cement ratio suffers from the worst deterioration, while the concrete with 0.31 ratio experiences the lightest degeneration.
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