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Strength prediction model of cast-in-place foam concrete with high porosity

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Document pages: 10 pages

Abstract: A study was carried out to develop three prediction models for compressive strength of high porosity cast-in-place foamed concrete (cement, cement, fly ash and cement sand mixtures) with dry density less than 700. The model is an extension of balshin model and considers the hydration rate of raw materials, in which the water cement ratio is a constant under a certain pouring density during the whole construction period. The results show that the measured porosity is slightly lower than the theoretical porosity because there are few inaccessible pores. For all three types of foams, the compressive strength increases exponentially with the increase of dry density to solid density, and increases with the increase of curing time.concrete. Based on the results that the compressive strength changes with the porosity and the curing time, a prediction model taking into account the mix constitution, curing time, and porosity is developed. A simple prediction model is put forward when no experimental data are available.

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