Designing 3D Printable Eco-Concrete by Utilizing Biodegradable Rheology Modifiers

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Title: Designing 3D Printable Eco-Concrete by Utilizing Biodegradable Rheology Modifiers

Author(s): Muhammad Zafar

Publication: Web Session

Volume: ws_S23_MuhammadZafar.pdf

Issue:

Appears on pages(s):

Keywords:

DOI:

Date: 4/2/2023

Abstract:
Rheological properties (viscosity, yield stress, thixotropy) are some key parameters in designing a 3D printable cementitious material as it significantly influences the fresh and hardened properties such as flowability, pumpability, extrudability, buildability, and various mechanical characteristics. Several researchers have focused on utilizing chemical admixtures to achieve critical rheological demands. However, these are non-renewable, oil-based products containing many undesirable toxic matters that include a prospective danger to the environment. On the other hand, a family of organic admixtures called bio-degradable admixtures can be an alternative to chemical admixtures to serve the same purpose. These are renewable, abundantly available environment-friendly materials. Starch is the most prominent member of this family, which can be utilized as mineral addition such as corn starch, cassava starch, potato starch, and arrowroot starch, or as polymeric additives, including bio-gums (diutan-gum and welan-gum), cellulose ethers (methylcellulose) or modified starch (carboxymethyl starch and hydroxypropyl starch). This study utilizes self-degradable additives as rheology modifiers both as mineral addition (corn starch, potato starch, and cassava starch), polymeric addition (methylcellulose), and biogum (Welan gum). These admixtures will be used individually and in different combinations to evaluate their potential effects on the rheology, printability, and mechanical characteristics of the 3D-printable concrete.




  


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