摘要

目前，我国建筑行业的自动化水平与其他行业相比尚显落后，可持续化发展的理念也没有在土木工程技术上得到明显的体现。在世界范围内实现自动化和环保绿色建筑势在必行。建筑3D打印技术是近年来产生的一项高新自动化建筑技术，而再生细骨料混凝土工艺是实现建筑业可持续发展的重要途径，因此本文将两者结合，对具有广阔前景的“自动+绿色建造”进行了系统的探索性研究。

首先，本文对国内外一系列的建筑3D打印然后还有再生细骨料混凝土等技术的相关研究现状进行了总结，介绍了研究方法和技术路线。接着，本文简要地介绍了以下建筑3D打印的相关机理，与此同时拿挤出固化式建筑3D打印工艺还有FDM工艺做了一系列的比较，提出建筑3D打印材料的发展方向。

其次，依据正交试验的原理，完成了相关研究建筑3D打印用再生细骨料混凝土的最优的配合比的实验，系统地探讨了一下水灰比、再生细骨料的取代率和纤维的用量等相关因素对再生细骨料混凝土工作性能、各方面强度以及耐久性的影响，得出最优化的3D打印的再生细骨料混凝土的最优配合比，并通过微观结构检测及耐久性试验加以验证。

最后，在完成了基于挤出固化的建筑3D打印试验之后系统验证了本文再生细骨料混凝土配合比的优化性能，介绍了试验装置、试验材料、建模以及实体打印的全过程，并成功打印带底座的曲壁花盆和整体试块，同时，将其与FDM打印过程及结果进行了比较与分析。

本文在梳理了建筑3D打印的发展历程及关键技术问题的基础上，重点研究了用于建筑3D打印的再生细骨料混凝土的最优配合比，指出了目前的建筑3D打印存在的一系列主要的问题，对于进一步研究建筑3D打印的技术、发展建筑3D打印的材料还有就是打印装置的系统还是具有一定的借鉴的意义。

关键词：3D打印建造；FDM工艺；再生细骨料混凝土；正交试验设计；

Abstract

In construction industry in China, the level of automation is relatively low compared with those of others’, and the basic ideas of sustainable development are not apparently applied as well. As concepts in Building Construction are changing worldwide especially in developed countries, to realize automatic and green construction with high efficiency and sustainability has been a common trend. Building 3D printing is a high-tech automatic construction technology in recent years, and on the other hand recycled aggregate concrete is a critical approach to fulfill such sustainable development. So the author combined both of them and conducted systematic study to prospective “automatic & green construction”.

At first, research status of building 3D printing and recycled aggregate concrete were summarized both in China and abroad, and the methodology and technical route used in this thesis was introduced. In the following part, a brief introduction to principles and printing system of building 3D printing were presented, at the same time ,the difference between Extrusion Printing and Fused Deposition Modeling（FDM）was compared. The development direction of building 3D printing material is put forward

Next, based on orthogonal experimental theory, experiments were designed and conducted which tested recycled fine aggregate concrete with different mix proportions used for 3D printing. Through a series of experiments, the effects of w/c ratio, replacement ratio and fiber usage on workability, strength and durability were explored, and the optimal mix proportion of recycled fine aggregate concrete used for 3D printing was obtained, which was verified by the microstructure test and durability test.

Last but not least, the author accomplished experiments on the Extrusion Printing 3D printing machine verifying feasibility of the optimal mix proportion. The whole processes were displayed in the thesis including devices and material preparations, modelling and printing, and then the printed flowerpots and specimens were shown. At the same time, the results were compared and analyzed with the FDM printing process.

In this thesis, critical technical problems of building 3D printing were clarified, and optimal mix proportion designed. The main problems existing in the building 3D printing was also pointed out. For further study on related areas, it has some reference significance.

Key Words:Building 3D printing; FDM,recycled fine aggregate concrete, orthogonal experimental design;