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Fly ash used as the main raw materials,incorporated with sintering expansion additive and fluxing additive in different ratio,was sintered high-strength lightweight aggregates of fly ash (ceramsite) in the laboratory-controlled electric furnace.The results show that the optimal sintering system is the sintering temperature range of 1250 ℃ to 1280 ℃ and retaining time of 5 min-10 min.The bulk density,the apparent density and 24 h water absorption of ceramsites decrease with the increase of sintering additive and the decrease of the amount of fly ash.The addition of fluxing additive can significantly enhance the compressive strength of ceramsite pellets,reduce its water absorption at 24 h and improve pore-shape ofinner structure.The firing coefficient (Pk) changed within 7.8-8.1 of raw materials can prepare high strength and low water absorption ceramsites.Pk kept a good linear relationship with porosity and strength of ceramsite particles. 相似文献
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研究养护温度对高延性水泥基复合材料性能的影响,分析养护温度在20、40、60和80℃时水泥基复合材料的抗弯性能、抗压强度、抗折强度及裂缝分布特点.结果表明,养护温度越高,高延性水泥基复合材料的早期跨中挠度越小;养护温度高于40℃时,试件的跨中挠度和韧性指数随龄期延长无明显变化;高养护温度能显著提高高延性水泥基复合材料的早期抗压强度和抗折强度,龄期对高温养护条件下高延性水泥基复合材料的抗压、抗折强度影响不大;粉煤灰掺量相同时,常温养护下高延性水泥基复合材料的裂缝更加细密均匀;养护温度为60℃时,粉煤灰掺量提高至80%,高延性水泥基复合材料的韧性显著提高,28d抗压强度可达70MPa. 相似文献