Gimenez-Carbo Ester, Torres Raquel, Coll Hugo, Roig-Flores Marta, Serna Pedro, Soriano Lourdes
Institute of Concrete Science and Technology (ICITECH), Universitat Politècnica de València, 46022 Valencia, Spain.
Department of Mechanical and Engineering Construction, Universitat Jaume I, 12071 Castellon de la Plana, Spain.
Materials (Basel). 2022 Apr 8;15(8):2750. doi: 10.3390/ma15082750.
Three-dimensional printed concrete (3DPC) is a relatively recent technology that may be very important in changing the traditional construction industry. The principal advantages of its use are more rapid construction, lower production costs, and less residues, among others. The choice of raw materials to obtain adequate behavior is more critical than for traditional concrete. In the present paper a mixture of cement, silica fume, superplasticizer, setting accelerator, filler materials, and aggregates was studied to obtain a 3DPC with high resistance at short curing times. When the optimal mixture was found, metallic fibers were introduced to enhance the mechanical properties. The fresh and hard properties of the concrete were analyzed, measuring the setting time, workability, and flexural and compressive strength. The results obtained demonstrated that the incorporation of fibers (2% in volume) enhanced the flexural and compressive strength by around 163 and 142%, respectively, compared with the mixture without fibers, at 9 h of curing. At 28 days of curing, the improvement was 79.2 and 34.7% for flexural and compressive strength, respectively.
三维打印混凝土（3DPC）是一项相对较新的技术，在改变传统建筑业方面可能非常重要。使用它的主要优点包括施工速度更快、生产成本更低以及残渣更少等。与传统混凝土相比，选择能获得适当性能的原材料更为关键。在本文中，研究了一种由水泥、硅灰、高效减水剂、促凝剂、填充材料和骨料组成的混合物，以获得在短养护时间内具有高强度的3DPC。当找到最佳混合物后，引入金属纤维以增强力学性能。分析了混凝土的新拌性能和硬化性能，测量了凝结时间、工作性以及抗弯和抗压强度。获得的结果表明，在养护9小时时，与无纤维混合物相比，掺入纤维（体积分数为2%）分别使抗弯强度和抗压强度提高了约163%和142%。在养护28天时，抗弯强度和抗压强度的提高分别为79.2%和34.7%。
