Abstract
Based on the construction characteristics in the Northeast China Region under low temperature conditions, this article studies the influences of admixtures without antifreezing agent of different types and amounts on the low-temperature concrete and characteristics of pore structure. The results show that the amount of the admixtures is stable, the compressive strength of concrete under the curing condition of low temperature naturally varying is higher than the strength under the curing condition of constant low temperature while the porosity of the concrete under the curing condition of low temperature naturally varying is lower than the porosity under the curing condition of constant low temperature; The most appropriate curing method for the concrete used in winter construction is the curing method of low temperature naturally varying.
Highlights
Durability of concrete has become a research focus at home and abroad
The writer adopts the concrete without antifreezeing agents, the characteristics of pore structure of concrete with fly ash and silica fume are tested by adjusting the addition amount and adding methods of fly ash and silica fume under the curing conditions of minus temperature naturally varying and constant minus temperature, and the development of pore structure can be verified through the tests on the compressive strength at different ages to determine the reasonable amount of admixtures and the appropriate curing methods for concrete for winter construction
Portland cement(P.O 42.5)produced by Shenyang Jidong Cement Limited Company ; ordinary water ; coarse aggregate is gravel with the grain diameter of 5-20mm and continuous grain gradation; fine aggregate is river sand with fineness modulus of 2.8 ; fly ash FA is the Ilevel coal ash produced by a thermal power plant in Shenyang; silica fume SF is the silica fume produced by Qinghai Huadian Ferroalloy Limited Liability Company; superplasticizer is FN-1 and the early strength agent is Na2SO4
Summary
Durability of concrete has become a research focus at home and abroad. The cold injury is the main problem of the durability of concrete in northern China. The cold injury of concrete at its early age causes irreparable damages to its durability in later period. Studying the characteristics of low-temperature concrete plays a significant role in protecting concrete from cold injury at its early age and improving the durability of lowtemperature concrete in later period. The writer adopts the concrete without antifreezeing agents, the characteristics of pore structure of concrete with fly ash and silica fume are tested by adjusting the addition amount and adding methods of fly ash and silica fume under the curing conditions of minus temperature naturally varying and constant minus temperature, and the development of pore structure can be verified through the tests on the compressive strength at different ages to determine the reasonable amount of admixtures and the appropriate curing methods for concrete for winter construction
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