An alternative method for performance improvement of ultra-high performance concrete by internal curing: Role of physicochemical properties of saturated lightweight fine aggregate

Peiliang Shen, Jian Xin Lu, Linnu Lu, Yongjia He, Fazhou Wang, Shuguang Hu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

35 Citations (Scopus)

Abstract

To prepare low-shrinkage ultra-high performance concrete (UHPC) with adequate mechanical properties and durability, the role of physicochemical properties of saturated lightweight fine aggregate (LWFA) in controlling the properties development of UHPC was explored. The test results showed that the LWFA could not only mitigate autogenous shrinkage significantly but also improve compressive strength and durability of UHPC. The internal curing of LWFA mitigated the reduction of internal relative humidity and promoted the hydration of cement and pozzolanic reaction. As a result, more C-S-H gel with higher polymerization degree was formed, contributing to improved micro-mechanical properties. Meanwhile, the pores in UHPC containing LWFA were significantly refined and a dense zone was formed around LWFA. Therefore, the increased hydration and pozzolanic reaction degrees, enhanced density and polymerization degree of C-S-H gels and refined pore structure of matrix counteracted the negative effects induced by the porous LWFA, contributing to the improved properties of UHPC.

Original languageEnglish
Article number125373
JournalConstruction and Building Materials
Volume312
DOIs
Publication statusPublished - 20 Dec 2021

Keywords

  • Autogenous shrinkage
  • Internal curing
  • Micro-mechanical properties
  • Microstructure
  • Performance

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction
  • General Materials Science

Fingerprint

Dive into the research topics of 'An alternative method for performance improvement of ultra-high performance concrete by internal curing: Role of physicochemical properties of saturated lightweight fine aggregate'. Together they form a unique fingerprint.

Cite this