白云岩石粉用于3D打印混凝土的试验研究OA

[Purposes]Dolomite powder(DP)is one of the natural waste powders generated dur-ing the mining and processing of dolomite.For its better utilization,this study is carried out.[Meth-ods]A sustainable 3D printing concrete(3DPC)was investigated by using DP as a partial replace-ment of cement and the printability and mechanical properties of 3DPC were evaluated.Meanwhile,mechanism analysis of the properties of hardened 3DPC with DP was conducted by using scanning electron microscopy and energy dispersive spectroscopic X-ray analysis.Moreover,the potential of DP usage to reduce carbon emission and energy consumption of 3DPC was explored.[Results]The results show that the fluidity and open time of 3DPC are improved with the increase of DP content.When the content of DP reaches 5%,the buildability and interlayer bond strength of 3DPC are im-proved.The dedolomitization reaction of DP contributes to the improvement of flexural and compres-sive strengths of 3DPC in the later stage.From this study,it can be concluded that incorporating a certain amount(5%in this study)of DP can improve the printability of 3DPC without significantly in-fluening its mechanical properties.Furthermore,the DP incorporation can reduce the amount of ce-ment usage and decrease the carbon emission of printing materials.