掺粉煤灰和矿渣粉大流动度混凝土的碳化性能

研究了复掺Ⅱ级粉煤灰和同等细度矿渣粉且同时加入高交减水剂的大流动度（约180mm)混凝土的抗碳化性能。试验中改变了取代水泥量（最大为80％）及掺合料中粉煤灰和矿渣粉的比例等条件，混凝土碳化深度随时间的变化可用幂函数d=at^b表示，其中b值大多位于0．3－0．4，复掺可使取代水泥量提高，对设计寿命为50年的混凝土，在其他性能满足工程要求的条件下，仅就碳化性能而言，可掺加40％的粉煤灰，若采用粉煤灰与矿渣粉复掺，则在掺合料掺量分别为60％，70％及80％时，相应地可掺加40％，30％及15％的粉煤灰。

Carbonation Resistance of Concrete Containing Ground Fly Ash and Ground Granulated Blast Furnace Slag

The carbonation resistance of high fluidity(about 180 mm) concrete containing fly ash, ground granulated blast furnace slag and superplasticiser was studied. Experimental parameters, such as substituting content for cement(maximum:80%) and proportion of fly ash to slag were varied. Relation of carbonation depth of concrete to time is described by the equation d=at b , in which b ranges mostly from 0.3 to 0.4. Both fly ash and slag are used to increase the total substituting content of cement. For example, from the point of carbonation resistance, concrete designed for 50 years service life allowes addition of fly ash by 40% if all other engineering requirements are satisfied. When both fly ash and slag are added, the total addition rises to 60%,70% and 80%, in which fly ash occupies 40%,30% and 15%, respectively.