Influence of Formwork Material on Transport Properties of Self-Consolidating Concrete near Formed Surfaces


This study aims at determining the influence of the formwork material on transport properties of concrete cover when using self-consolidating concrete (SCC). Two types of formwork were used. The plywood (PW) formwork material which is relatively rough and absorbent compared to the PVC material that has a very smooth and non-absorbent surface. A total of 17 SCC and highly flowable concrete mixtures with wide range of slump flow and T50 values were investigated. The concrete was used to fill 400 x 500 x 200 mm3 moulds made with either PVC or PW. Sorptivity tests were performed on core samples (100 mm in diameter and 50 mm in length) taken from the sides and center of the prepared moulds after 28 days of moist curing. This paper presents new experimental method using image analysis to quantify the relative surface area of coarse aggregate along different sections near formed surfaces. Sorptivity of concrete near the surface cast against the PW formwork was found to be significantly lower than that of PVC one due to the decrease of local w/c and wall effect. The examination of packing density of coarse aggregate near PVC and PW surfaces showed limited wall effect near the PVC formwork and significant wall effect within a thickness comparable to the maximum size of coarse aggregate near the PW formwork.


Civil, Architectural and Environmental Engineering

Keywords and Phrases

Absorption; Aggregates; Capillary flow; Concrete aggregates; Concretes; Molds; Rheology; Transport properties; Capillary absorption; Concrete cover; Formwork; Self-consolidating concrete; Sorptivity; Wall effects; Concrete mixtures; Aggregate packing

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Article - Journal

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Publication Date

01 Aug 2017