详情

Design of 3D Printable Eco-Concrete by Utilizing Rheology Modifiers for Sustainable Infrastructure

项目名称：	Design of 3D Printable Eco-Concrete by Utilizing Rheology Modifiers for Sustainable Infrastructure
摘要：	3D printing technology has become more commonplace in diverse industries in recent years. The popularity of this technology in the construction industry has been increasing; however, there are some challenges related to designing 3D-printable construction materials and adjusting their fresh properties for the 3D-printing process. Rheological properties, including viscosity, yield stress, and thixotropy, are the fundamental parameters to be considered for 3D printing applications. They significantly influence the key properties of 3D-printed concrete in the fresh and hardened states, including buildability, extrudability, and mechanical characteristics. Several researchers have utilized chemical admixtures (retarders/accelerator/superplasticizers/rheology modifiers) to achieve critical rheological demands. However, these are non-renewable, oil-based products containing many undesirable toxic matters that include a prospective danger towards the environment and can also cause the reinforcement's corrosion. On the other hand, organic admixtures have the potential to replace chemical admixtures as an alternative, and they are abundantly available renewable materials. This study utilizes self-degradable additives (corn starch and cassava starch), supplementary cementitious materials (silica fume, nano-clay), and viscosity modifying admixture (methylcellulose). These admixtures will be used individually and in different combinations to evaluate their potential effects on the rheology, green strength, printability, and mechanical characteristics of the 3D-printable concrete. Fresh properties will be measured using a flow-table test. A rheometer will be used to study the plastic viscosity, yield stress, and thixotropy evolution over different intervals. The green strength will be examined using the direct shear and uniaxial compressive strength tests for different ages. The printability of the selected mixes will be assessed in terms of extrudability and buildability. Moreover, the 28-day compressive strength of the specimens will also be checked.
状态：	Active
资金：	110000
资助组织：	Office of the Assistant Secretary for Research and Technology
管理组织：	Transportation Consortium of South-Central States (Tran-SET)
项目负责人：	Mousa, Momen R
执行机构：	University of New Mexico, Albuquerque
主要研究人员：	Hojati, Maryam
开始时间：	20220401
主题领域：	Bridges and other structures；Construction；Highways；Materials