Experimental Study On Mix Design And Fudamental Properties For Mixed Mortars Using Recycled Fine Aggregates

With the development of human society and environmental awareness, the reusing of construction waste becomes one of the hot issues for engineering field and scientific research field. The research and application of reusing concrete waste is developed rapidly, especially the reusing of recycled coarse aggregate. However, so far, the reusing of recycled fine aggregate doesn't catch enough attention, causing the low reusing ratio of construction waste. And the abandoned bricks take a larger part of construction waste, which is an actual situation in our country, so the recycling of waste bricks should be studied deeply. Because of low strength, a lot of fine aggregates will be produced after waste bricks crushed. In summary, it is important to study the recycled fine aggregate of construction waste in our country.Based on the experimental study for compressive performance and shrinkage deformation of different strength grades'mixed mortars which are made of different kinds of fine aggregate respectively, the main factors affecting the strength, such as the curing age and the kind of fine aggregate, the main factors affecting the shirnkage deformation, such as the curing ages, the ambient temperature, the relative humidity, the kind of fine aggregate and the strength grade, are discussed and analyzed. The formulas which estimated the strength of recycled fine aggregate mixed mortar are suggested, the formulas which estimated the shirnkage deformation of the recycled fine aggragate mixed mortar curing in natural environment are aslo given out. Besides, the formulas match well with the experimental datas, so the results may be as a reference for the application of mixed mortar using recycled fine aggregate in engineering.