Prediction of Concrete Failure Time Based on Statistical Properties of Compressive Strength

Abstract

Since the heterogeneity of the cement-based material contributes to a random spatial distribution of compressive strength, a reliability analysis based on the compressive strength of concrete is fundamental to carry out structural safety assessment. By analyzing 10,317 datapoints on compressive strength of concrete, a time-varying reliability evaluation based on the third-moment (TM) method was proposed to predict the service life of concrete. Unlike the second-moment (SM) method, skewness is taken into account in the TM; thus, the calculated result of concrete failure time based on the TM is more accurate. In this paper, the errors of the calculated results using time-varying reliability evaluation are within 3%, as shown by Monte Carlo (MC) simulation. In addition, the proposed model (aiming to calculate the equivalent design compressive strength) verifies the concrete failure time calculated by time-varying reliability. According to the results, concrete failure times calculated by these two models are in good agreement. Overall, based on the simple and effective methodology adopted in this paper, it is feasible to develop time-varying reliability based on other factors that might also lead to concrete failure, such as carbonation-induced corrosion, cracking, or deflection of the concrete.

Influence of Variatropy on the Evaluation of Strength Properties and Structure Formation of Concrete under Freeze-Thaw Cycles

“…Currently, one of the primary subjects for the premature concrete structures' destruction operated in various aggressive conditions is the insufficient resistance of concrete to cyclic effects of alternate freeze-thaw [1], carbonation [2], loading [3,4], moistening, and drying [5,6], as well as to various types of corrosive effects [7]. The resistance of concrete to alternate freezing and thawing is one of the key long-term characteristics, which further determines the service life of the concrete and reinforced concrete structures made of geopolymer concrete [8], ordinary concrete [9], waste concrete [10], and pavement concrete [11,12].…”

Experimental Study on the Size Effect on the Probability Distribution of Concrete Compressive Strength

“…e statistical characteristics of compressive strength were not significantly different. Wang et al [13] established a statistical relationship between the compressive strength and service life of concrete using 10,317 specimens. Kilinc et al [14] drilled 264 concrete specimens with a diameter of 28 mm from existing buildings and statistically evaluated their compressive strength.…”