Prediction of Drying Shrinkage Cracking of Eco-efficient Steel Chip Reinforced Cementitious Composite Considering Tensile Creep

Abstract

This paper reports on the characteristics of drying shrinkage and creep of steel chip reinforced cementitious composite (SCRCC). In this study, first, four restrained wall specimens made of normal mortar and SCRCC with various numbers of steel reinforcing bars (4 or 10) were prepared to compare drying shrinkage characteristics. The specimens were restrained on the rigid laboratory floor so that shrinkage cracks were induced. The drying shrinkage strains were measured by the contact gauge method and compared with unrestrained small specimens. The number of cracks was simultaneously observed. Second, bond tests were prepared to evaluate the bond characteristics between the SCRCC and the steel bar. Third, creep tests were performed to improve the accuracy of the analysis of the drying shrinkage behavior. Twelve block specimens were made and a constant flexural load was applied for 7, 14, and 28 days. The observed shrinkage strains and creep strains of SCRCC were modeled according to CEB-FIP Model Code 1990. These models were incorporated with bond computation between the SCRCC and the steel bar to predict the number of drying shrinkage cracks. The computed equivalent number of cracks based on the shrinkage strain model, the creep model, and the bond model derived from a pull-out test generally agreed with the test results.

Drop-Weight Impact Loading of Polypropylene Fiber Reinforced Concrete Wall after One-Year Drying Shrinkage

“…Material age increments are 0.05 days up to seven days, and of 0.175 days up to one year. Tensile creep is considered by accumulating tensile strains step by step (Hong et al 2015;Ida et al 2016;Kato et al 2019).…”

Prediction of Drying Shrinkage Cracks of Steel Chip Reinforced Polymer Cement Mortar

“…An experiment based on the research of Koyanagi et al and Kheder was conducted in an attempt to predict the shrinkage strain and cracking behavior of SCRCC (Hong et al 2015). It was found that the drying shrinkage and cracking characteristics of SCRCC were influenced by tensile creep caused by restraint of the reinforcing bar.…”