EFFECT OF PORE STRUCTURE ON FROST RESISTANCE OF CONCRETE MIXED WITH CERAMIC POWDER

LIU Zimei; YAO Zhanquan; WANG Zongxi; WU Hanhan

doi:10.13204/j.gyjzG20032908

Volume 51 Issue 2

Jun. 2021

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LIU Zimei, YAO Zhanquan, WANG Zongxi, WU Hanhan. EFFECT OF PORE STRUCTURE ON FROST RESISTANCE OF CONCRETE MIXED WITH CERAMIC POWDER[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(2): 158-165. doi: 10.13204/j.gyjzG20032908

Citation:

LIU Zimei, YAO Zhanquan, WANG Zongxi, WU Hanhan. EFFECT OF PORE STRUCTURE ON FROST RESISTANCE OF CONCRETE MIXED WITH CERAMIC POWDER[J]. INDUSTRIAL CONSTRUCTION, 2021, 51(2): 158-165. doi: 10.13204/j.gyjzG20032908

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EFFECT OF PORE STRUCTURE ON FROST RESISTANCE OF CONCRETE MIXED WITH CERAMIC POWDER

doi: 10.13204/j.gyjzG20032908

College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Hohhot 010018, China

Received Date: 2020-03-29
Available Online: 2021-06-04

Abstract

Abstract

Ceramic powder is used as an admixture to replace cement, and then mixed with mineral powder to prepare concrete. The mass, compressive strength and dynamic elastic modulus of concrete were determined to analyze the frost resistance after 25 freeze-thaw cycles. The freeze-thaw damage model was established to forecast durability life. Nuclear magnetic resonance (NMR) test was carried out to analyze the microporosity characteristics of concrete after freeze-thaw cycles. The grey entropy analysis was introduced to link micro-pore structure with concrete durability, and the main factors affecting the frost resistance of the concrete mixed with ceramic powder were obtained pore structure to frost resistance. On this basis, the prediction model of compressive strength after freeze-thaw cycles was established.The results showed that the loss of mass, compressive strength and dynamic elasticity modulus of concrete mixed with ceramic powder was less at the later stage of freeze-thaw cycles. The maximum durability frost-resistant life could reach 32 years. T₂ spectrum area, porosity, free fluid saturation and larger size pore ratio increased with freeze-thaw cycles.The addition of ceramic powder could reduce the deterioration of pore structure.The pore characteristic parameters that mainly affected the frost resistance of ceramic powder concrete were porosity, bound fluid saturation and the pore size of 0.05 to 0.2 μm, and the average relative error of the GM model was 4.43%.
- concrete,
- ceramic powder,
- compressive strength,
- freeze-thaw cycles,
- nuclear magnetic resonance,
- grey entropy

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