Accelerated Deterioration Mechanism and Reliability Evaluation of Concrete in Saline Soil Area

Abstract

To reveal the deterioration mechanism and service life of concrete durability in the western saline soil area, the indoor accelerated test of the concrete specimen was simulated in the coupled environment of salt erosion and dry-wet cycles in the west saline soil area of China. The deterioration mechanism of concrete durability was revealed through the relative dynamic elastic modulus, relative quality evaluation parameters, SEM, and XRD evaluation indexes. Random Wiener distribution function was used for modeling life prediction. The results show that the relative dynamic elastic modulus evaluation parameter as an evaluation index of concrete durability under various environmental coupling effects is more reliable than the relative quality, there were holes and cracks in the concrete, and needle-like and layered crystals grow from the internal cracks. The corrosion products include ettringite, gypsum and other expansive crystals and non-gelling Mg(OH)₂; the expansion stress caused by physical, chemical reaction, and temperature change under the action of dry-wet cycle aggravates the formation and development of cracks. The random Wiener distribution function can describe the degradation process of concrete specimen durability, and the established concrete reliability function can intuitively reflect the service life of concrete specimens.

Keywords

concrete / saline soil area / service prediction / random wiener / durability / deterioration mechanism