CAJ | 학술논문

随着我国高速铁路的持续建设和投入运营， CA砂浆充填层不断出现破坏，经调研发现，充填层的破坏多与水有关。将CRTSI型CA砂浆浸泡在5、20、40℃和60℃的恒温清水中，当浸泡到7、28 d和90 d时，用万能试验机做单轴压缩试验，分析其力学性能变化和破坏机理。结果表明：随浸泡时间增加， CA砂浆的抗压强度和弹性模量均逐渐降低，并且在前28 d下降速度快，幅度大，原因归结于 CA砂浆在前28 d吸水基本饱和，后期吸水较少；随浸泡温度的升高，浸泡7 d的CA砂浆，与浸泡28 d和90 d的相比，弹性模量表现出不同的变化规律，分析原因，在浸泡早期，硬化浆体中未水化水泥颗粒遇水继续水化起主要作用，随浸泡时间增长，水对沥青-水泥水化产物界面和沥青-砂界面黏结力的破坏发挥主导作用。
수착아국고속철로적지속건설화투입운영， CA사장충전층불단출현파배，경조연발현，충전층적파배다여수유관。장CRTSI형CA사장침포재5、20、40℃화60℃적항온청수중，당침포도7、28 d화90 d시，용만능시험궤주단축압축시험，분석기역학성능변화화파배궤리。결과표명：수침포시간증가， CA사장적항압강도화탄성모량균축점강저，병차재전28 d하강속도쾌，폭도대，원인귀결우 CA사장재전28 d흡수기본포화，후기흡수교소；수침포온도적승고，침포7 d적CA사장，여침포28 d화90 d적상비，탄성모량표현출불동적변화규률，분석원인，재침포조기，경화장체중미수화수니과립우수계속수화기주요작용，수침포시간증장，수대력청-수니수화산물계면화력청-사계면점결력적파배발휘주도작용。
With the continued construction and operation of high-speed railway in China, the frequent destruction of CA mortar filling layer occurs, which is closely related to water as indicated in the research. The uniaxial compression test is carried out with a electronic universal test machine when CRTS ( china railway track system) typeIcement asphalt mortar ( CA) specimens are immersed in water at the temperature of 5, 20, 40 ℃ and 60 ℃ for 7 d, 28 d and 90 d to analyze the changes of mechanical properties and mechanism of destruction. The test results show that with the increase of soaking time the pressure strength and elasticity modulus of CA mortar are reduced gradually, and tend to be faster with great amplitude specifically during the preceding 28 d. The reason is that during the preceding 28 d, CA mortar is saturated with water almost completely and absorbs a little afterwards. Compared with CA specimens soaked for 28 d and 90 d, the elasticity modulus of those soaked for 7 d change irregularly. The reasons which lead to this phenomenon are: in the early stage, the hydration reaction of cement continues in the water where the cement grain not hydrated in the hardened mortar meets with water;with increased soaking time, the destruction of asphalt-cement hydration interface and asphalt-sand interface is caused mainly by water.