Proposal of a method for service life prediction of a concrete structure: a case study

Abstract

This article presents a method for service life prediction of concrete structures. The proposed method aims to estimate the performance of a concrete structure through its permeability to carbon dioxide penetration, in order to verify its accordance to Brazilian standards. This case study is based on an inspection made in an educational building in the city of Porto Alegre, Rio Grande do Sul, Brazil. Through carbon dioxide penetration, non-destructive and partial destructive tests, an estimated service life design for the concrete structure was elaborated. These tests were carried out in the parking lot because there is a greater vulnerability of the structure in terms of concentration of vehicles and lack of finishing, such as mortars or paints. The tests carried out showed that the selected concrete pieces were carbonated from 2.9 to 4.4 mm deep, a situation whose prognosis suggests a superior performance in accordance with the parameters set in ABNT NBR 15575:2013.

Durability Prediction Method of Concrete Soil Based on Deep Belief Network

“…By substituting the relevant parameters of the two constraint regions into formula (5), the value of uniform external pressure can be determined, the uneven lateral restraint can be provided along the periphery of the concrete, the interference of the strength improvement coefficient in the compression state can be eliminated, the maximum constraint stress of the concrete core region can be determined, and then, the constraint stress of the two regions can be added [13][14][15]. Suppose that the external pressure in the strong constraint area is p 1 and that in the weak constraint area is p 2 , then the calculation formula of the external pressure N under the compression state of concrete is as follows:…”