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LWA as Internal Curing Agent to Control Availability of Internal Curing Water in Concrete

Published online by Cambridge University Press:  08 November 2013

Luis Emilio Rendon ,
Montserrat Rendon  and
Norma Ramirez
Luis Emilio Rendon
Affiliation:
Mexican Institute of Water Technology, Jiutepec, Morelos, México
Montserrat Rendon
Affiliation:
Centre of Arts of the State of Morelos, Cuernavaca, Morelos, Mexico.
Norma Ramirez
Affiliation:
Mexican Institute of Water Technology, Jiutepec, Morelos, México
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Abstract

The effectiveness of lightweight aggregate (LWA) as an internal curing agent (ICA) to reduce concrete shrinkage is evaluated for repair concrete used in cultural heritage works (RCCHW) using curing periods of 30 days. Normal weight aggregate is replaced by LWA at volume replacement levels ranging from 10 to 14%. The mixtures contain Portland cement maintaining the paste content at approximately 24.1% of concrete volume. Comparisons are made with mixtures containing low-absorption granite and high-absorption limestone normal weight coarse aggregates. At the replacement levels used in this study, LWA results in a small reduction in concrete density, no appreciable effect on concrete compressive strength, and a decrease in concrete shrinkage for drying periods up to 30 days. With a curing period of 14 days, all mixtures with LWA exhibited less shrinkage than the mixtures with either low- or high-absorption normal weight aggregates.

Keywords

compositewateradditives
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1612: Symposium 4B – Concrete and Durability of Concrete Structures , 2013 , IMRC2013-S4B-P017
Copyright
Copyright © Materials Research Society 2013 

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References

REFERENCES

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