Early–Age Shrinkage of High-Performance Concrete Beam in Laboratory and Full-Scale

Abstract

The beam is a significant element structure in bridge and high - rise building. The aim of this study is to obtain the difference of early age shrinkage between beam with laboratory scale and full scale. High-performance concrete with compressive strength of 60 MPa was used. This research was done experimentally in Indonesia for 24 hours. Three pieces of specimens measuring laboratory size of 150 mm × 150 mm × 600 mm, and one specimen measuring 200 mm ×600 mm ×3000 mm as full - scale specimen were used. All specimens were covered with styrofoam to eliminate transfer humidity. Early age shrinkage was obtained by using an embedded vibrating wire strain gauge for each laboratory size specimen and four embedded vibrating wire strain gauge for the full-scale specimen. As a result, the shrinkage type of full- scale specimen is a similar type to laboratory size. Shrinkage in laboratory size specimen is 31.5% larger than in full-scale specimen. Maximum shrinkage in a full-scale specimen is about 0.8E-04 occurs at the concrete age of 15.8 hours, while in laboratory size specimen is about 1.255E-04 occur at the age of 22.2 hours. Fluctuation expansion and shrinkage are smoother in full-scale than in laboratory size specimen. This is because in full-scale ettringite can expand more optimally so that it can come with stand shrinkage losses due to the growth of hydration products. High rate deformation of both specimens scale is occurring in the age range of 5-9 hours. Therefore, it is safe to assume the behavior of a real beam of high-performance concrete similar to laboratory size beam.

Keywords: Beam, Concrete, Early, Shrinkage, Size

DOI: 10.7176/CER/11-4-05

Publication date:May 31st 2019