309.2R-15: Guide to Identification and Control of Visible Surface Effects of Consolidation on Formed Concrete Surfaces

ABOUT THE INTERNATIONAL CONCRETE ABSTRACTS PORTAL

  • The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.

International Concrete Abstracts Portal

  


Title: 309.2R-15: Guide to Identification and Control of Visible Surface Effects of Consolidation on Formed Concrete Surfaces

Author(s): ACI Committee 309

Publication: Technical Documents

Volume:

Issue:

Appears on pages(s): 10

Keywords: bugholes; consistency; consolidation; construction joints; discoloration; form offset; formwork (construction); layer lines; mixture proportioning; plastic settlement cracking; preplaced-aggregate concrete; quality control; sand streaking;

Date: 3/16/2015

Abstract:

This document provides guidelines for identifying and controlling visible effects on the surface of concrete as it relates to consolidation on precast or cast-in-place-formed concrete surfaces. A perfectly homogenous and blemish-free concrete element is difficult, if not impossible, to achieve. This document, therefore, does not define an acceptable level of quality, as this should be defined in the contract documents.

This guide explores the direct and indirect cause-and-effect relationships, as well as other factors, concerning concrete surface appearance. Photographs are included in this document to illustrate typical concrete surface finish effects that are a departure from absolute perfection. Negative surface effects in concrete can be minimized by proper planning during the design and specification stages. Significant consolidation factors that minimize undesirable concrete negative surface effects are also discussed.