Temperature effect on strength of mortars and concrete containing blended cements

✍ Scribed by Wajahat H. Mirza; Soliman I. Al-Noury; Waleed H. Al-Bedawi

• Publisher: Elsevier Science
• Year: 1991
• Tongue: English
• Weight: 531 KB
• Volume: 13
• Category: Article
• ISSN: 0958-9465
• DOI: 10.1016/0958-9465(91)90020-i

✦ Synopsis

The results of a study on the influence of temperature on the compressive strength of mortars and concrete are described. Identical specimens were exposed to temperatures of 25°C, 35°C or 50°C for sustained periods of up to 300 days. Besides ordinary Portland cement (OPC), blends of OPC with powdered tuff, powdered slag and silica fume were used in mortar and concrete mixtures. Specimens at 25°C were cured by submerging under water, whereas curing at 35°C and 50°C was in air after the first 24 h in a moist, humid room. Reduction in water/cement ratio was achieved in one set of OPC specimens by adding a suitable admixture. Compressive strength tests were also performed on (?PC paste specimens. Test data indicate that paste, mortar or concrete specimens which contain cement blends generally show a lower strength on a short-term basis (testing up to 28 days), but their strengths at later ages are higher than those of OPC specimens, particularly when cured at temperatures of 35°C and 50°C. Such specimens also show a better resistance to the detrimental effect of prolonged exposure to high temperatures.