Feasibility of Using Construction Residual Soils to Develop ColdPressing Recycling Coarse Aggregates

Abstract:

The coldpressing technique, which incorporates the principles of cement chemistry and composite material was employed to produce the recycling coarse aggregates using B23, B3, B4, and B6 categories construction residual soils with extremely low utilization rate and poor properties so as to raise the utilization rate and value of the abovementioned construction residual soils. The results show that the specific gravity of recycling coarse aggregate is about 1.80 in the ovendry(OD) state and 2.05 in the saturatedsurfacedry(SSD) state; the absorption capacity is approximately 15.5%(by mass); the bulk density (i.e. unit weight) is 1103 to 1216kg/m3; the air void is about 35.3%(by volume); the particle cylindrical crushing strength ranges from 17.06 to 23.33MPa; other characteristics meets reguirement set forth in ASTM C33. For this reason, the developed recycling coldpressing coarse aggregates can not only meet the specifications for green building materials, but can also be used to reduce the energy consumption and CO2 emission resulted from producing the sintering recycling aggregates.