CAJ | 학술논문

某水电站工程位于东南亚某国，由于天然砂砾料缺乏，混凝土骨料就近选择花岗片麻岩人工骨料。其岩石矿物组成主要是斜长石、石英、钾长石，少量黑云母、角闪石，主要化学成分为SiO2、Al2 O3。用岩相法和砂浆棒快速法检验原岩的碱活性，发现该人工骨料具有潜在危害性反应活性。主要原因是岩石矿物中存在一定量的微晶石英，加上受到构造应力作用，存在波状消光现象。碱活性抑制试验表明，通过掺入适量的粉煤灰、火山灰，可以达到较为理想的抑制效果。为此，工程建设时应尽量使用低碱水泥并严格控制水泥的含碱量，并切实采取碱活性抑制措施，从而提高混凝土耐久性。
모수전참공정위우동남아모국，유우천연사력료결핍，혼응토골료취근선택화강편마암인공골료。기암석광물조성주요시사장석、석영、갑장석，소량흑운모、각섬석，주요화학성분위SiO2、Al2 O3。용암상법화사장봉쾌속법검험원암적감활성，발현해인공골료구유잠재위해성반응활성。주요원인시암석광물중존재일정량적미정석영，가상수도구조응력작용，존재파상소광현상。감활성억제시험표명，통과참입괄량적분매회、화산회，가이체도교위이상적억제효과。위차，공정건설시응진량사용저감수니병엄격공제수니적함감량，병절실채취감활성억제조시，종이제고혼응토내구성。
Granitic gneiss artificial aggregate is selected as artificial aggregate for a hydropower project in a country of South-east Asia where natural sand -gravel aggregate is scarce. The major mineral composition of the material rock is anorthosite, quartz, orthoclase with a few of biotite and hornblende, and their chemical compositions are mainly SiO2 , Al2 O3 . The alkali-re-action of raw rocks was tested by lithofacies method and accelerated mortar bar method and the test discovered that the artificial aggregate has harmful alkali-reaction and the main cause is that the rock contains a certain amount of microcrystal quartz that appears wavy extinction phenomenon due to tectonic stress. The results of alkali-reaction inhibition test indicate that moderate incorporation of fly ash or volcano ash into the concrete may meet the inhibitory requirement. The project should use low alkali cement and control alkali content of cement strictly, and the active measures for alkali-reaction inhibition should be taken to im-prove concrete durability.