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Title:

Performance of Polypropylene Fibers and Silica Fume Concrete for Bridge Overlays

Accession Number:

01372881

Record Type:

Component

Abstract:

Silica fume has been successfully used in concrete bridge overlays to impede moisture and chloride ingress thus minimizing corrosion problems. Laboratory and field work both show that silica fume concrete is particularly sensitive to curing. Polypropylene fibers have been considered to minimize potential cracking and to enhance the overall concrete performance. However, there is a scarce data regarding the interaction of the two constituents and applicators often seek recommendations pertinent to the types and dosages to be incorporated. This document presents the major part of a larger scale investigation that aims at achieving better understanding of silica fume and polypropylene fibers interaction. The work herein focuses on the short and long term properties of concrete that can be implemented in bridge overlays. To meet the study goals, twenty-four mixtures were prepared and sets of fresh concrete, hardened concrete tests were performed. Chemical durability, permeability and cracking pattern were evaluated in various environments. Results reveal that silica fume/polypropylene concrete is highly influenced by the dosages of both ingredients. Both fibers and silica fume result in a slump reduction while the silica fume and low water to cementitious ratio are the two major contributors to compressive strength increase. The fibers examined had minor contribution to flexural strength. Upon adequate silica fume and fibers, the composite can yield low permeability, minimized cracking and good chemical soundness.

Supplemental Notes:

This paper was sponsored by TRB committee AFN40 Concrete Materials and Placement Techniques

Monograph Accession #:

01362476

Report/Paper Numbers:

12-3942

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Massoud, May Tarek
Abu Zeid, Mohamed Nagib
Fahmy, Ezzat Hassan

Pagination:

20p

Publication Date:

2012

Conference:

Transportation Research Board 91st Annual Meeting

Location: Washington DC, United States
Date: 2012-1-22 to 2012-1-26
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; Photos; References; Tables

Subject Areas:

Bridges and other structures; Highways; Materials; I30: Materials; I32: Concrete

Source Data:

Transportation Research Board Annual Meeting 2012 Paper #12-3942

Files:

TRIS, TRB

Created Date:

Feb 8 2012 5:20PM