利用营建剩余土石方开发冷压型再生粗骨料之可行性

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

根据材料互制性,配合水泥化学,并导入复合材料的观念,采用冷压技术,开发以性质较差且再利用率或再生性甚低的B2-3,B3,B4,B6类营建剩余土石方为母材的再生粗骨料,期望提高其再利用率及经济价值.试验结果显示,采用冷压技术所制作的再生粗骨料性质为:烘干相对密度约1.80;面干内饱和相对密度约2.05;吸水率约15.5%(质量分数);堆积密度为1 103～1 216kg/m3;空隙率约35.3%(体积分数);筒压强度为17.06～23.33MPa;其他性质亦符合ASTM C33规范要求.因此利用营建剩余土石方及冷压技术所开发的再生骨料,不仅符合再生绿色建材的精神,亦可降低生产烧结型再生骨料所消耗之能源与CO2排放.

The cold-pressing technique, which incorporates the principles of cement chemistry and compo- site material was employed to produce the recycling coarse aggregates using 132-3, 133, 134, and 136 catego- ries construction residual soils with extremely low utilization rate and poor properties so as to raise the uti- lization rate and value of the above-mentioned construction residual soils. The results show that the specif- ic 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 1 103 to 1 216 kg/m^3 ; the air void is about 35.3% （by volume） ; the particle cylindrical crushing strength ranges from 17.06 to 23.33 MPa; 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.