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复合填料由废铸砂、粉煤灰、聚苯乙烯(EPS)颗粒、水泥和水按一定质量比例混合制成,具有低导热性、抗冻胀和轻质特性。根据热阻力法则和比等效导热系数相等法则,将材料视为由大量正方形单元体组成,其中心为一个球形EPS颗粒,这种单元体与总体的导热系数相等。运用AN SY S软件对复合填料单元体的传热过程进行了有限元模拟,根据瞬态法导热系数测试原理,推求不同EPS掺入比情况下的复合填料导热系数,分析EPS颗粒与导热系数的关系,发现材料导热系数随着EPS掺入比的增加而快速降低。将材料导热系数数值模拟与实测结果作比较,发现有限元模拟值与实测值接近,说明采用有限元方法可以实现对材料传热过程的模拟。
Composite filler from the waste sand, fly ash, polystyrene (EPS) particles, cement and water by a certain mass ratio of mixing, with low thermal conductivity, anti-frost heaving and lightweight properties. According to the law of thermal resistance and the equivalent thermal conductivity equal principle, the material is considered as a large number of square elements, the center of a spherical EPS particles, this element and the overall thermal conductivity equal. AN SY S software was used to simulate the heat transfer process of composite filler unit. According to the test of thermal conductivity coefficient of transient method, the thermal conductivity of composite filler with different EPS incorporation ratio was deduced, and the relationship between EPS particles and thermal conductivity It was found that the thermal conductivity of the material decreased rapidly with the increase of EPS incorporation ratio. Comparing the numerical simulation of thermal conductivity with the measured data, it is found that the finite element simulation value is close to the measured value, which shows that the finite element method can be used to simulate the heat transfer process.