The Effect of Elevated Temperature on Ordinary Portland Cements

Abstract

A study was directed to analyze the influence of the different types of Ordinary Portland Cements (OPC) on the hardened cement paste exposed to high temperatures. Hardened cement paste specimens with three types of cement and nine water-cement ratios were investigated and heated to 11 heat steps at 28 days of age. Residual compressive strength and relative residual compressive strength were compared to the unheated results. It was shown that the expected range for the relative residual strength of the different types of OPC up to 400 °C is between 90 and 100%. From the local minimum at 150 °C to the maximum at 300 °C. The CEM I 52.5 type of cement shows the least favorable behavior to the increased (over 400 °C) temperature, according to the results of the residual compressive strengths curves and the newly introduced Integrated Temperature Endurance values after the first water-cement ratio (0.3). Nine water-cement ratios were tested with the favorable types of OPC (CEM I 42.5 and CEM I 32.5). At all water-cement ratios, the residual strength tendencies for the two types of cement were parallel. It has been observed that changes in the water-cement ratio have little to no impact on the relative strength curve's shape or the relationship between strength and the water cement ratio. As a result of our experiments applying simply Ordinary Portland Cement, it is obvious that the CEM I 32.5 type of OPC cement significantly outperformed the CEM I 42.5 type in regards of post-heating strength tendencies.

Influence of Elevated Temperatures on the Compressive Strength of Concrete Made with Different Types of Aggregate

“…It is also noted that the heating temperature 600 °C is considered as the temperature limit to guarantee the structural integrity of Portland cement concrete. Additionally, the literature suggests that the exposure time and heating rate can also have a significant influence on the compressive strength of normal-strength concrete at high temperatures [23,24].…”

Properties of Fine Graded Perlite-Based Lightweight Cement Mortars Subjected to Elevated Temperatures

“…The type of binder used in such mortars depends on the operating temperature of the particular object. A common choice is high-alumina cement (HAC) or calcium alumina cement (CAC), but mixtures of these compounds with Portland cement, or Portland cement alone or in blends, can also be used in a limited temperature range [30,31]. The binder can also be enriched with fly ash or silica fume [32].…”