Effect of Mixing and Placing in Hot Weather on Hardened Concrete Properties

Suyun Ham,Taekeun Oh

doi:10.1007/s40069-013-0041-4

Suyun Ham, Taekeun Oh

Open Access

https://doi.org/10.1007/s40069-013-0041-4

Copy DOI

Abstract

Portland cement concrete exposed to high temperatures during mixing, transporting, casting, finishing, and curing can develop undesirable characteristics. Applicable requirements for such the hot weather concrete differ from country to country and government agencies. The current study is an attempt at evaluating the hardened properties of the concrete exposed to hot weather in fresh state. First of all, this study reviews the current state of understanding and practice for hot weather concrete placement in US and then roadway sites with suspected hot weather concrete problems were investigated. Core samples were obtained from the field locations and were analyzed by standard resonance frequency analysis and the boil test. Based on the results, there does not appear to be systematic evidence of frequent cracking problems related to high temperature placement. Thus, the suspicious deteriorations which are referable to hot weather concreting would be due to other factors.

Highlights

Portland cement concrete can develop undesirable characteristics when the material exhibits high plastic temperatures while it is being mixed, transported, cast, finished, and cured during hot weather (Newman 1971; Soroka 1993; Turton 1995)
The common feature in these three sites is that concrete temperatures were high, either very close to or above 90 °F (32.2 °C)
It is pointed out that the data suggest hot samples tend to show higher permeable void volume and lower dynamic modulus than the cold samples as a whole, but this cannot be established with a high degree of statistical confidence, i.e. 95 %

Summary

Introduction

Portland cement concrete can develop undesirable characteristics when the material exhibits high plastic temperatures while it is being mixed, transported, cast, finished, and cured during hot weather (Newman 1971; Soroka 1993; Turton 1995). An. Many researchers have tried to explain the adverse effects of the hot weather concreting on the hardened concrete properties, but there still exist various theories such as Feret’s relation considering strength and design factors, Arrhenius law associated with strength and maturity and the hydration kinetics (Kayyali 1984; Mouret et al 2003; Ortiz et al 2005). Many researchers have tried to explain the adverse effects of the hot weather concreting on the hardened concrete properties, but there still exist various theories such as Feret’s relation considering strength and design factors, Arrhenius law associated with strength and maturity and the hydration kinetics (Kayyali 1984; Mouret et al 2003; Ortiz et al 2005) Such researches have been conducted under well-controlled laboratory condition, so they cannot reflect the actual field condition with many variables. It is worthwhile to investigate the effects of hot weather concreting on the hardened concrete properties under outdoor field condition because there is still no marked influence on the hardened properties

Objectives

Results

Conclusion