Title: Quantitative Measurement of Water Absorption of Coarse Lightweight Aggregates in Freshly-Mixed Concrete

Author(s): Yong‑Hyok Kim, Cho‑Bum Park, Byoung Il Choi, Tae Yong Shin, Yubin Jun, Jae Hong Kim

Publication: IJCSM

Volume: 14

Issue:

Appears on pages(s):

Keywords: lightweight aggregate, prewetting, water absorption

DOI: 10.1186/s40069-020-00408-x

Date: 7/30/2020

Abstract:
The high water-absorption of lightweight aggregate causes a high slump loss and poor workability of concrete. A prewetting process is usually recommended to compensate for the workability problem, but its application needs more delicate consideration in feld. A method is proposed to measure the additional water absorption of lightweight aggregate, and its application in cement paste and concrete mixes confrms the absorption amount remaining unafected by the mix proportion. The additional water absorption in cement-based materials can be considered as a material property, and its value is smaller than the water absorption measured by a standard test method (watersoaking). Compensating the additional water absorption fnally allows to use dry lightweight aggregates for concrete, which is more robust and stabler than taking a saturated surface-dry lightweight aggregates.