Influence of Barchip fiber on early-age autogenous shrinkage of high-strength concrete internally cured with super absorbent polymers: Fid-Bau Portal

Influence of Barchip fiber on early-age autogenous shrinkage of high-strength concrete internally cured with super absorbent polymers

Shen, Dejian / Wen, Chuyuan / Zhu, Pengfei / Wu, Yuhua / Wu, Yue

Abstract

Highlights • The autogenous shrinkage decreased with increasing Barchip fiber by volume. • The addition of SAPs decreased the autogenous shrinkage of concrete. • The prediction models of early-age autogenous shrinkage strain were proposed. • A model of autogenous shrinkage strain based on ultrasonic velocity was proposed.

Abstract High-strength concrete (HSC) usually suffers the high early-age autogenous shrinkage owing to the low water-binder ( $w / b$ ) ratio. Barchip fiber and super absorbent polymers (SAPs) have been utilized to reduce the autogenous shrinkage of HSC at early age. The relationship between autogenous shrinkage and ultrasonic velocity of internally cured high-strength concrete (ICC) reinforced with Barchip fiber was studied utilizing the non-contact shrinkage test. Experimental study and corresponding analysis demonstrated that: the autogenous shrinkage and ultrasonic velocity of concrete decreased with the volume percentage of Barchip fiber increasing, and decreased with the addition of SAPs; models for predicting early-age autogenous shrinkage strain and ultrasonic velocity of ICC reinforced with Barchip fiber considering the fiber volume percentage and age were proposed; the model of early-age autogenous shrinkage strain based on the results of ultrasonic velocity at different ages and at 28 d with no addition of Barchip fiber was proposed; the prediction model of early-age autogenous shrinkage strain of ICC reinforced with Barchip fiber based on the age-dependent parameter on ultrasonic velocity was proposed.