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Influence of mixing and curing temperature on strength development and pore structure of fly ash mass concrete

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Document pages: 11 pages

Abstract: The purpose of this work is to clearly understand the influence of temperature response to curing conditions, hydration heat and external weather conditions on the strength development of high performance concrete. Concrete walls are designed in three different sizes and three different types of concrete. The experiment was carried out under typical summer and winter weather conditions. The temperature history at different locations of the wall was recorded, and the strength development of concrete at these locations was measured. The main factors affecting the strength development of the prepared samples are bound water content, hydration products and pore structure. The test results show that the increase of temperature in summer will not affect early springe strength gain of concrete made using ordinary Portland cement. Strength development was significantly increased at early ages in concrete made using belite-rich Portland cement or with the addition of fly ash. The elevated temperatures resulted in a long-term strength loss in both belite-rich and fly ash containing concrete. The long-term strength loss was caused by a reduction in the degree of hydration and an increase in the total porosity and amount of smaller pores in the material.

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