Abstract

Abstract The composition characteristics of concrete, such as water/cement ratio, cement consumption and compressive strength directly affect its handling performance and durability. Thus, the technical standards related to concrete structures recommend technical specification concerning different environmental aggressiveness classes. Therefore, this study followed an experimental method aiming to evaluate the relationship between the characteristics of four different concrete mixes produced in accordance to the specifications of the standards EN 1992-1 and EN 206 for quality of hardened state concrete and its behavior during accelerated tests of carbonation and salt spray. Analyzes of compressive strength, void index, total and capillary water absorption, specific gravity, electrical resistivity and ultrasonic wave propagation velocity were executed. For the statistical treatment, a Multivariate Analysis of Variance (MANOVA) was performed, which provided a simplified analysis of the durable potential of reinforced concrete structures by its characteristics. Results lead to two major groups of behavior, and statistical significant differences in deterioration tests between mixes 1 and 4 for the salt spray test and between mix 4 and the others for the carbonation test.

Highlights

  • Concrete structures have been used worldwide for over 100 years due to their properties of resistance, versatility and load carrying capacity, in addition to mastery and vast knowledge of this technology [1-4]

  • The technical standards related to concrete structures recommend technical specification concerning different environmental aggressiveness classes

  • A Multivariate Analysis of Variance (MANOVA) was performed, which provided a simplified analysis of the durable potential of reinforced concrete structures by its characteristics

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Summary

Introduction

Concrete structures have been used worldwide for over 100 years due to their properties of resistance, versatility and load carrying capacity, in addition to mastery and vast knowledge of this technology [1-4] Amid this period, professionals could learn the main characteristics of concrete and how these relate to durability and performance, and how to preserve the proper-ties. The everyday specification of concrete progresses, currently employing fine and microfine components such as pozzolans, superplasticizers, and improved adjustment of safety coefficients, originated from the advances in calculation procedures and structural design [7,8,9] This constant evolution requires technical standards that can instruct and tell professionals what characteristics must be followed in order to reach satisfactory behavior, considering that these criteria must concern the concrete’s environmental aggressiveness class [10]. Considering the scenario presented, this study aims to contribute evaluating relations between the characteristics stipulated for meeting concrete durability standards, those presented by EN 1992-1 and EN 206:2013 [13-15], examining the durability potential of the mixes specified and how the durability of these materials can be predicted by performing hardened state tests

Characteristics of concrete
Accelerated tests for predicting the durabilty of concrete structures
Experimental procedure
Data summarization
Description of samples and identification of outliers
Independence and normality
Homoscedasticity
Visual inspection
Correlation between dependent variables
Conclusion

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