CAJ | 학술논문

喷射混凝土是新奥法三大关键技术之一，对隧道围岩稳定起着重要的作用。速凝剂在喷射混凝土中为必不可少的外加剂，对喷射混凝土的质量有很大的影响。提出一种新型的高效液态速凝剂，具有掺量小、凝结时间短、后期强度损失少等特点。该液态速凝剂掺量为水泥质量的1％～3％，水泥净浆试验初凝时间为2 min左右，终凝时间为4 min左右，后期强度损失在10％以内，均满足国家一等品的要求。对速凝剂进行现场试验，在实际喷射过程中具有回弹小、无落浆等优点，是一种较为理想的喷射混凝土用液态速凝剂，具有良好的推广应用价值。
분사혼응토시신오법삼대관건기술지일，대수도위암은정기착중요적작용。속응제재분사혼응토중위필불가소적외가제，대분사혼응토적질량유흔대적영향。제출일충신형적고효액태속응제，구유참량소、응결시간단、후기강도손실소등특점。해액태속응제참량위수니질량적1％～3％，수니정장시험초응시간위2 min좌우，종응시간위4 min좌우，후기강도손실재10％이내，균만족국가일등품적요구。대속응제진행현장시험，재실제분사과정중구유회탄소、무락장등우점，시일충교위이상적분사혼응토용액태속응제，구유량호적추엄응용개치。
Shotcreting is one of the key technologies of NATM,and it plays an important role in tunnel rock stability. Accelerator is an essential admixture in sprayed concrete,and it has a significant influence on quality of sprayed con-crete.The authors present a new highly efficient accelerator,which has characteristics of small dosages,short setting time and little loss of the later strength.Volume for the general quality of cement is 1%~3%.Initial setting time is about 2 min while the final setting time is about 4 min.The loss of the later strength of the concrete is within 10%.After the actual test in tunnel engineering,the accelerator has advantages of small rebound,less dust,which is an ideal liquid accelerator for sprayed concrete,and it is worth popularizing.