CAJ | 학술논문

考虑再生粗骨料和细骨料的取代率、单位用水量、水灰比四个因素,设计正交试验对再生混凝土单排孔砌块的抗压和抗折强度进行试验研究,根据试验结果得到各因素对砌块力学性能的影响程度及规律,并得到较优配合比,即单位用水量150 kg/ m3,水灰比为0.4,再生粗、细骨料取代率均为40%。将再生混凝土视为退化的普通混凝土,从实际水灰比和再生集料压碎指标方面分析了再生混凝土砌块强度变化的内在机理。定义了再生混凝土砌块的再生集料影响系数 D,得出 D 与再生混凝土砌块的强度存在显著的线性相关关系。在较优配合比组合的基础上研究了砂率对再生混凝土砌块抗压强度的影响,配制出了强度等级为 MU5.0的再生混凝土单排孔承重砌块。
고필재생조골료화세골료적취대솔、단위용수량、수회비사개인소,설계정교시험대재생혼응토단배공체괴적항압화항절강도진행시험연구,근거시험결과득도각인소대체괴역학성능적영향정도급규률,병득도교우배합비,즉단위용수량150 kg/ m3,수회비위0.4,재생조、세골료취대솔균위40%。장재생혼응토시위퇴화적보통혼응토,종실제수회비화재생집료압쇄지표방면분석료재생혼응토체괴강도변화적내재궤리。정의료재생혼응토체괴적재생집료영향계수 D,득출 D 여재생혼응토체괴적강도존재현저적선성상관관계。재교우배합비조합적기출상연구료사솔대재생혼응토체괴항압강도적영향,배제출료강도등급위 MU5.0적재생혼응토단배공승중체괴。
Considering the effects of four factors, including recycled coarse aggregate replacement ratio, recycled fine aggregate replacement ratio, water consumption and water-cement ratio, an or-thogonal test was conducted to study the compressive and flexural strength of recycled concrete sin-gle-row blocks. According to the experimental results, the influences of four factors on mechanical properties of recycled concrete blocks were summarized, and the optimal mixture ratio was found (water consumption is 150 kg / m3 , water-cement ratio was 0. 4, recycled coarse and fine eggregates ratios were 40% ). Recycled concrete was regarded as the degradation of normal concrete. The actu-al water-cement ratio and crushing index of recycled aggregate were proposed to analyze the internal mechanism of strength variation of recycled concrete blocks. The impact factor D of recycled aggre-gate for recycled concrete single-row blocks was defined, and the relationship between impact factor D and the strength of blocks was also analyzed. Based on the former optimal mixture ratio, the influ-ence of sand ratio on the compressive strength of recycled concrete single-row blocks was investiga-ted; thereby a type of load-bearing recycled concrete single-row block with strength degree of MU 5. 0 was developed.