HOW TEMPERATURE AFFECTS EARLY AGE CONCRETE BEHAVIOR UNDER LOCAL CONDITIONS

The present paper aims to present the evolution of eompressive concrete strength at early age under local conditions. In this fact, a large scale test has been investigated using concrete with type II cement for assessing the mechanical strength development in function of curing mode and temperature of treatment that simulate Algeria climate. The different curing mode were saturated, without evaporation and ambient. The curing temperature were 20, 30 and 50°C successively. Measurements were taken at the ages of 0.42, 1, 2, 3, 7 and 28 days. Three others concrete mixes were used at water-cement ratio of 0.45, 0.55 and 0.65 to determine the temperature evolution in core of massive concrete elements that have volume-exposed surface ratio of 0.05, 0.10 and 0.15. The temperature evolution was continuously followed from 24 hours and up to three days of concrete age. Obtained results attest that, at early age, the eompressive strength rate is affected by temperature, type of moulds and curing conditions. Tensile strength was affected as like as the eompressive strength. The temperature in the core of test-specimens varies with the type of moulds (plastic, steel, cardboard), curing conditions and with the concrete massivity.

• INTRODUCTION

• EXPERIMENTAL PROGRAM

• MATERIAL USED AND CONCRETE CONFECTION

• RESULTS AND DISCUSSION

• CONCLUSIONS

• BIBLIOGRAPHIES