论文部分内容阅读
为研究级配因素对水泥铁砂导热砂浆性能的影响,以及针对不同应用领域选择合理的级配组成问题,通过导热系数试验、抗折强度和抗压强度试验,分别分析了水灰比、总砂灰比、铁砂比对材料导热系数、抗折强度和抗压强度的影响;应用灰关联理论分析得到了导热性能、抗折强度、抗压强度与水灰比、总砂灰比、铁砂比之间的关联度;基于灰靶理论评价了15种级配组成的综合性能,并以导热系数、抗折强度、抗压强度和材料价格4个评价指标权重给出不同级配组成的综合性能评估方法,以及应用于融冰雪路面、桥面领域和化工导热领域时综合性能最好的级配组成。研究结果表明:随着水灰比的增大,水泥铁砂导热砂浆的导热性能、抗折强度和抗压强度均减小;随着总砂灰比的增大,导热系数增大,抗折强度与抗压强度在总砂灰比为2.5时最佳;随着铁砂比的增大,铁砂含量增加,导热系数和抗折强度增大,抗压强度在铁砂比为0.6时最佳;铁砂比对导热系数的影响最大,水灰比对抗折强度的影响最大,水灰比和铁砂比对抗压强度的影响均较大,总砂灰比对3项性能的影响均较小。研究结果为实际运用中选择合适的水泥铁砂导热砂浆提供了理论指导。
In order to study the influence of grading factors on the performance of cement-iron sand thermal conductive mortar, and to choose reasonable compositional gradation in different application fields, this paper analyzed the effects of water-cement ratio, total sand Gray ratio and iron / sand ratio on the thermal conductivity, flexural strength and compressive strength of the materials. The thermal conductivity, flexural strength, compressive strength and water-cement ratio, total grit ratio, iron sand ratio Based on the gray target theory, the comprehensive performance of 15 gradation compositions was evaluated and the comprehensive performance evaluation of different gradation compositions was given by the weight of 4 evaluation indexes of thermal conductivity, flexural strength, compressive strength and material price Method, as well as applied to melt the ice and snow pavement, the field of bridge deck and the field of chemical thermal conductivity, the best integrated composition of the composition. The results show that with the increase of water-cement ratio, thermal conductivity, flexural strength and compressive strength of iron-sand mortar decrease. With the increase of total sand-cement ratio, thermal conductivity increases and flexural strength And compressive strength are the best when total sand-cement ratio is 2.5. With the increase of iron-sand ratio, the content of iron sand increases, the thermal conductivity and flexural strength increase, and the compressive strength is the best when iron-sand ratio is 0.6. The effect of water-cement ratio on the flexural strength is the largest. The effect of water-cement ratio and iron-sand ratio on the compressive strength is larger, and the effect of the total grit-ash ratio on the three properties is smaller. The results provide the theoretical guidance for the selection of suitable cement sand thermal conductive mortar in practical application.