关键词: 大体积混凝土;FC材料;温度裂缝;抗裂性能;

Abstract: In order to solve the problem of temperature cracks in mass concrete of hydraulic structures，it is considered to add ultra-high strength modified polyester synthetic fiber and ultrafine grain ceramic composite（ FC material ） into concrete.Based on the large-scale drainage pumping station project of Huama Lake No.2 Station in Ezhou City，the suitable dosage and specific construction technology of FC material were studied through field test.The test results showed that it was appropriate to add 1.2 kg FC material into every cubic meter of concrete.After adding FC material into coarse aggregate，it should be put into the mixing plant and continuously mechanically stirred for 70 s.This mixing process made FC material disperse evenly and avoided winding.In the pouring process，the pouring layer thickness was controlled within 40 cm，and the pouring construction method of layered pouring，layered vibration and step propulsion could solve the problem of easy cracking of mass concrete，which not only improved the crack resistance of concrete，but also prolonged the service life of the project.

Key words: mass concrete；ultra-high strength modified polyester synthetic fiber and ultrafine grain ceramic composite；temperature crack；crack resistance