Restrained Shrinkage Cracking of Fiber-Reinforced High-Strength Concrete

Ashkan Saradar,Behzad Tahmouresi,Ali Shadmani,Ehsan Mohseni

doi:10.3390/fib6010012

Ashkan Saradar, Behzad Tahmouresi + Show 2 more

Open Access

https://doi.org/10.3390/fib6010012

Copy DOI

Abstract

Concrete shrinkage and volume reduction happens due to the loss of moisture, which eventually results in cracks and more concrete deformation. In this study, the effect of polypropylene (PP), steel, glass, basalt, and polyolefin fibers on compressive and flexural strength, drying shrinkage, and cracking potential, using the ring test at early ages of high-strength concrete mixtures, was investigated. The restrained shrinkage test was performed on concrete ring specimens according to the ASTM C1581 standard. The crack width and age of restrained shrinkage cracking were the main parameters studied in this research. The results indicated that the addition of fiber increases the compressive strength by 16%, 20%, and 3% at the age of 3, 7, and 28 days, respectively, and increases the flexural toughness index up to 7.7 times. Steel and glass fibers had a better performance in flexural strength, but relatively poor action in the velocity reduction and cracking time of the restrained shrinkage. Additionally, cracks in all concrete ring specimens except for the polypropylene-containing mixture, was developed to a full depth crack. The mixture with polypropylene fiber indicated a reduction in crack width up to 62% and an increasing age cracking up to 84%.

Highlights

Concrete is known as one of the most applicable building materials all across the world.Its economy, the accessibility of its components, its suitable strength under different environmental conditions, and its high compressive strength are among the desired factors of concrete as a construction material [1,2,3]
The results showed that increased fiber contentcontent and length length considerably polyolefin crackup surfaces to 86% compared non-fiber considerably reduces reduces polyolefin shrinkageshrinkage crack surfaces to 86%up compared to non-fibertospecimens
The aim of the current research was to study the study of the effect offibers different fibers onshrinkage, early age compressive shrinkage, compressive strength, and the flexural effect different on early age strength, and the flexural strength of strength of high-strength concrete (HSC)

Summary

Introduction

Concrete is known as one of the most applicable building materials all across the world.Its economy, the accessibility of its components, its suitable strength under different environmental conditions, and its high compressive strength are among the desired factors of concrete as a construction material [1,2,3]. Concrete is known as one of the most applicable building materials all across the world. Concrete is weak against tensile strength and high strain, which can be compensated to a certain extent with reinforcement or fibers [5,6,7]. Fiber-reinforced concrete (FRC) has received considerable attention in civil engineering infrastructures such as pavements, bridges, tunnels, slabs, airports, shelters, and explosive storages. In this regard, concrete’s low tensile strength and brittleness, the high length-to-diameter ratio of fibers, and the distributed and dispersed concrete volume have been taken into consideration in recent decades. It is worth mentioning that mixtures containing fibers (steel) or reinforced concrete (RC) corrode and deteriorate (the load carrying capacity decreases) due to exposure to corrosive

Objectives

Methods

Results

Conclusion