Experimental Study on the Influence of Specific Factors on the Compressive Strength of Recycled Fine Aggregate Concrete

In this test, the waste concrete is pulverized, and the particles of appropriate diameter are selected as the recycled fine aggregate to replace the natural fine aggregate. Meanwhile, the test materials are processed in different ways, and are finally made into recycled concrete. The processing methods of test materials include: high temperature treatment of concrete particles, partial replacement of cement with fly ash, and replacement of water with sodium silicate solution. To process the materials is to study the influence of its single factor or the multiple coexistent factors on the compressive strength of recycled concrete, and then to explore the most effective method of recycled fine aggregate use under preset conditions. The results show that: 1) When the natural fine aggregate is replaced with the recycled fine aggregate and there is only a single variable factors, the compressive strength of the recycled concrete increase most obviously after the concrete particles are processed through a six-hour-long high temperature heat at 300°C, and when the replacement rate of recycled fine aggregate is about 35%, the strength value is the maximum; 2) When there are multiple variable factors in the test, the compressive strength of the recycled concrete is lower than that of the single variable factors.