CAJ | 학술논문

系统研究了由废弃混凝土二次再生制备的结构混凝土细骨料性能，分析了矿物与化学成分，依据日本JISA、美国ASTM和中国GB/T 25176-2010等相关再生细骨料标准对试验结果进行了等级评定，并建立了表观密度、胶砂强度与吸附砂浆含量之间的关系。结果表明：随着循环次数的增加，再生细骨料表观密度、吸水率、需水量比降低，胶砂强度比与细度模数增大，吸附的砂浆含量上升；与天然细骨料相比，首次与第二次再生细骨料中CaO的质量分数平均增长了5、10倍；再生细骨料胶砂强度与吸附砂浆含量呈二次曲线关系。不论采用什么标准，二次循环再生细骨料均满足结构混凝土用细骨料的性能要求。
계통연구료유폐기혼응토이차재생제비적결구혼응토세골료성능，분석료광물여화학성분，의거일본JISA、미국ASTM화중국GB/T 25176-2010등상관재생세골료표준대시험결과진행료등급평정，병건립료표관밀도、효사강도여흡부사장함량지간적관계。결과표명：수착순배차수적증가，재생세골료표관밀도、흡수솔、수수량비강저，효사강도비여세도모수증대，흡부적사장함량상승；여천연세골료상비，수차여제이차재생세골료중CaO적질량분수평균증장료5、10배；재생세골료효사강도여흡부사장함량정이차곡선관계。불론채용십요표준，이차순배재생세골료균만족결구혼응토용세골료적성능요구。
In order to explore the possibility of repeatedly recycling the waste concrete from different sources for structural concrete ag-gregate,the experiment researched the performance of recycled fine aggregate from both secondary renewable single sources and mixed sources,analysing the mineral and chemical component,grading the test results according to Japanese technical standards for recycled ag-gregate,ASTM and China GB/T 25177-2010 and other relevant recycled aggregate standards,establishing a relationship between aggre-gate indicators through the data fitting.The experimental results show that:with the increase of the cycle,the apparent density of recycled fine aggregate,the water absorption and water demand ratio decreases while the intensity ratio increases;the surface absorption mortar con-tent of circulation recycled aggregate increases;compared with natural fine aggregate,the mass fraction of CaO from first recycled fine ag-gregate increased by an average of 5 times,which from the second recycled fine aggregate increased by an average of 10 times;the com-pressive strength radio of recycled mortar and the absorption mortar content shows a quadratic relationship ,the curve down first then up shows that with the increase of regeneration frequencies,the compressive strength radio of recycled mortar elevates;The secondary recy-cled aggregates are satisfied with the performance requirements of structural concrete with fine aggregate regardless of what the standards and criteria taken.