Prediction of antifreeze critical strength of infant age concrete |
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Authors: | Jun Liu Runqing Liu |
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Affiliation: | (1) School of Civil & Hydraulic Engineering, Dalian University of Technology, Dalian, Liaoning, 116024, China;(2) School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang, Liaoning, 110168, China |
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Abstract: | The rule of infant age concrete strength development under low temperature and complex affecting factors is researched. An
efficient and reliable mathematical forecast model is set up to predict the infant age concrete antifreeze critical strength
under low temperature at construction site. On the basis of the revision of concrete equivalent coefficient under complex
influencing factors, least-squares curve-fitting method is applied to approximate the concrete strength under standard curing
and the forecast formula of concrete compressive strength could be obtained under natural temperature condition by various
effects. When the amounts of double-doped are 10% fly ashes and 4% silica fumes as cement replacement, the antifreeze critical
strength changes form 3.5–4.1MPa under different low temperature curing. The equivalent coefficient correction formula of
concrete under low temperature affected by various factors could be obtained. The obtained equivalent coefficient is suitable
for calculating the strength which is between 10% to 40% of standard strength and the curing temperature from 5–20 °C. The
forecast value of concrete antifreeze critical strength under low temperature could be achieved by combining the concrete
antifreeze critical strength value with the compressive strength forecast of infant age concrete under low temperature. Then
the theory for construction quality control under low temperature is provided.
Funded by the New Century College Outstanding Person Foundation of Liaoning (No.R-04-02) |
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Keywords: | low temperature concrete infant age equivalent coefficient least-squares curve-fitting strength prediction |
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