Title

Shrinkage-Time Responses of Bridge Deck Overlay Mixtures with Fibrous Additives

Document Type

Article

Publication Date

9-2010

Publication Source

Journal of the Chinese Ceramic Society (JCCS) [Guisuanyan Xuebao]

Volume

38

Issue

9

Inclusive pages

1638-1644

Publisher

Zhongguo Guisuanyan Xuehui

Place of Publication

China

ISBN/ISSN

0454-5648

Peer Reviewed

yes

Abstract

This paper presents the experimental results and findings on the effect of discontinuous synthetic fibers(non-metallic) on the drying shrinkage-time responses of various bridge deck concrete overlay mixtures.The studied mixtures include latex-modified concrete(LMC),micro-silica concrete(MSC),and fly ash concrete(FAC).These overlays typically experience shrinkage cracking at early and long-term ages even though careful mix designs and careful construction practices are employed.Reasons could be attributed to the large surface area of the overlay that is exposed to drying,their low water cement ratio,and their small typical thickness of about 55 mm.Therefore,it is believed that incorporating discontinuous synthetic fibers within the overlay mix design will not only increase their tensile strength and toughness properties but also will lower their drying shrinkage strains.In this paper,plain and fibrous mixtures were cast from the LMC,MSC,and FAC overlay types.Different types of fibers were used within the same mixture with an upper limit of the total fiber content of 1.78 kg/m3 due to constructability limitations.The drying shrinkage strains were monitored according to ASTM C157 for the various overlay mixtures.The shrinkage results showed that the fibrous mixtures experience lower drying shrinkage strains than corresponding plain mixtures.The shrinkage-time responses for the various overlay types were also compared.Compression and flexure tests results as well as permeability test results are also presented and compared herein for the various overlay mixtures.

Keywords

overlay fibers shrinkage permeability bridge deck latex-modified concrete micro-silica concrete fly ash concrete

Disciplines

Engineering

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