Pumice aggregates for internal water curing

Lura Pietro, Dale P. Bentz, David A. Lange, Konstantin Kovler, Arnon Bentur

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

A novel concept in internal curing of High Performance Concrete is based on dispersing very small, saturated lightweight aggregates (LWA) in the concrete, containing sufficient water to counteract self-desiccation. With this approach, the amount of water in the LWA can be minimized, thus economizing on the amount of the LWA. In this study, the pore structure of different size fractions of pumice aggregates was characterized by different techniques. The different size fractions show differences in porosity, sorption behavior, and pore-size distribution. The smaller size fractions have lower water absorption, but they release a greater percentage of their absorbed water at the equilibrium relative humidity of practical interest in early-age concrete, above 90%. Additionally, early-age properties of mortars with different contents of saturated pumice were investigated: a reference mix without pumice and mixes with 4% and 8% pumice by volume of mortar. By addition of pumice, mortars with improved strength, enhanced degree of hydration and reduced autogenous shrinkage were obtained. An important obstacle to the application of this kind of pumice for actual concrete production is saturation of the particles, which can be achieved only by immersion in boiling water or by vacuum saturation.
Original languageEnglish
Title of host publicationPRO 36: Proc. Int. RILEM Symp. on Concrete Science and Engineering : A Tribute to Arnon Bentur
Number of pages247
Place of PublicationHaifa
PublisherRilem publications
Publication date2004
Edition1
Pages137-151
ISBN (Print)2-912143-46-2
Publication statusPublished - 2004
EventInt. RILEM Symp. on Concrete Science and Engineering : A Tribute to Arnon Bentur - Northwestern University, Evanston, Illinois, USA
Duration: 1 Jan 2004 → …

Conference

ConferenceInt. RILEM Symp. on Concrete Science and Engineering : A Tribute to Arnon Bentur
CityNorthwestern University, Evanston, Illinois, USA
Period01/01/2004 → …

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