本研究主要探討內政部建築研究所「再生混凝土施工規範草案」所規定之H級與N級再生粗粒料及其所製成再生混凝土之工程相關特性。研究中利用廢棄混凝土粒料、市售紅磚塊及常重天然粒料等三種材料製作H級、N級及未達N級等三類粗粒料，使用W/C = 0.45及0.6兩種水灰比，不添加任何卜作嵐材料，製作16組不同配比之再生混凝土，探討變數包括硬固混凝土之單位重、抗壓強度、超音波速、表面電阻、滲透係數及熱傳導性質等。
研究中顯示，所製成H級及N級等兩種再生粗粒料之比重、吸水率及磨損率均符合規範要求。16組配比中，7種配比使用H級及N級再生粗粒料、A至D等四種不同粗粒料取代比率，在0.45水灰比時，可製成合乎規範之A級再生混凝土(350 kgf/cm2 < f'c)，8種配比使用H級及N級再生粗粒料、A至D等四種不同粗粒料取代比率，在0.60水灰比時，可製成合乎B級再生混凝土(210< f'c < 350 kgf/cm2)，最後1種配比使用未達N級再生粗粒料及D級粗粒料取代比率(100 %)，在0.45水灰比時，亦可製成合乎B級再生混凝土，顯示規範所訂定之再生粗粒料分類表及再生混凝土類別表具有可行性，且趨於保守。

This research mainly studies the engineering properties of recycled coarse aggregates and recycled concrete of Taiwan following the regulation specified in the “Draft of Construction Specification for Recycled Concrete” published by the Ministry of Interior The study uses the recycled concrete coarse aggregate, the commercial red brick and normal-weight natural aggregate to produce the H-class, N-class and lower-than-N-class recycled aggregates. Two water/cement ratios of 0.45 and 0.60 were used without any additional mineral admixtures to manufacture 16 different mixture proportions. The properties under study include hardened concrete unit weight, compressive strength, ultrasonic pulse velocity, surface electrical resistance, methanol permeability coefficient and thermal conduction etc.
Test results show that the specific gravity, water absorption and abrasion rate of the resulting H-class and N-class recycled coarse aggregate can meet the requirements of specification. Among sixteen mixtures, seven mixtures that use H-class and N-class recycled coarse aggregate, four different replacement rates of A to D and 0.45 water-cement ratio can produce the A-class recycled concrete (34.34 MPa< f'c). Eight mixtures that use H-class and N-class recycled coarse aggregate, four different replacement rates of A to D and 0.60 water-cement ratio can produce the B-class recycled concrete (20.60 MPa < f'c < 34.34 MPa). The last single mixture that uses lower-than-N-class recycled coarse aggregate, 100 % replacement and water-cement ratio of 0.45 can also produce the B-class recycled concrete. These results indicate the feasibility of classifications for recycled coarse aggregate and recycled concrete as specified by the specification with certain conservative.

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