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将普通混凝土视为水泥胶结骨料的聚集体,受硫酸盐侵蚀的过程简化为粒间胶结物的减少,将此侵蚀因素引入已有的无厚度有抗转动的颗粒胶结接触模型中并利用DEM模拟混凝土受硫酸盐的侵蚀,并与室内试验作对比分析,结果表明:该模型能够反映混凝土受硫酸盐侵蚀的作用:单轴抗压强度随反应时间的增加而减小,抗压抗蚀系数也随时间减小;试样破坏形态在初期为可见的碎块状,而在长时间的侵蚀后,破坏后的碎块较小,从表面看不到试样中的大裂隙;试样的胶结破坏以拉剪扭破坏为主。
The ordinary concrete is regarded as the aggregate of cemented cementitious aggregate. The process of sulphate erosion is simplified to the reduction of intergranular cement. The erosion factor is introduced into the existing non-thickness anti-rotation granular cemented contact model and the DEM The simulated concrete was attacked by sulphate and compared with laboratory tests. The results show that the model can reflect the effect of sulphate corrosion on concrete: the uniaxial compressive strength decreases with the increase of reaction time, and the compressive and anticorrosion coefficient But also decreases with time. The shape of specimen failure is visible in the initial stage, while after a long period of erosion, the damaged pieces are smaller and no large cracks in the specimen can be seen from the surface. Cemented damage to shear-torsional damage-based.