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为了制备热学性能良好的水泥基储能材料,通过室内试验,对比研究了石墨、炭黑和氧化铁黑3种储能材料对水泥净浆物理力学性能和热学性能的影响。试验结果表明,随着三种储能材料掺量的增大,水泥的水灰比逐渐增大,绝干容重和前后期强度逐渐减小,同时导热系数和热扩散系数逐渐增大,体积热容逐渐减小,热学性能得到改善;当掺量相同时,氧化铁黑对水泥力学性能的影响最小,石墨次之,而炭黑最大;3种储能材料对水泥热学性能的改善顺序依次是:石墨>炭黑>氧化铁黑;加入3中储能材料后水泥的导热系数和储能材料掺量之间有很好的线性相关性,其中加入石墨后的回归系数A最大为0.081 4,表明水泥的热学性能对石墨掺量最敏感。
In order to prepare the cement-based energy storage material with good thermal properties, the effects of graphite, carbon black and iron oxide black on physical and mechanical properties and thermal properties of cement paste were compared by laboratory tests. The results show that with the increase of the content of the three kinds of energy storage materials, the water-cement ratio of cement increases gradually, the TBR and the strength at the beginning and the end of the cement gradually decrease, and the thermal conductivity and thermal diffusivity gradually increase. When the content of iron oxide black is the same, the effect of iron oxide black on the mechanical properties of cement is smallest, graphite is the second, and carbon black is the largest. The improvement order of the thermal storage properties of the three kinds of energy storage materials is : Graphite> Carbon black> Iron oxide black. There is a good linear correlation between the thermal conductivity of cement and the content of energy storage material after adding 3 energy storage materials. The maximum regression coefficient A after adding graphite is 0.081 4, It shows that the thermal properties of cement are the most sensitive to the content of graphite.