Effect of Fly Ash on Frost and Scour Resistance of Concrete for Channels
Concrete channels in northern Xinjiang are heavily frost-heave and scour and wear,and the cost of concrete used in channels is relatively high.In order to make reasonable use of fly ash resources in Xinjiang and ensure the frost resistance and scour resistance of concrete used in channels,concrete with fly ash content of 0％(mass fraction,the same below),10％,20％and 30％,respectively,was prepared.At the same time,the mechanical properties,freeze-thaw cycle and erosion wear tests were carried out in combination with the ratio used in the production of prefabricated concrete channels.The results show that 3 and 7 d mechanical properties of concrete decrease with the increase of fly ash content,and 28 d mechanical properties of concrete with 10％fly ash content are the best.The frost resistance of concrete increases first and then decreases with the increase of fly ash content.The forst resistance of concrete with 20％fly ash content is the best.Compared with the concrete without fly ash,the frost resistance of concrete with 10％and 20％fly ash content is improved.The impact wear resistance of concrete increases first and then decreases with the increase of fly ash content.The scour resistance of concrete with 10％fly ash content is the best,and the scour resistance of concrete with 10％fly ash content is improved by about 12％compared with that without fly ash.The results show that fly ash can improve the frost resistance and scour resistance of concrete.
国家科技期刊平台
NSTL
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