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RSS FeedsMolecules, Vol. 25, Pages 844: One-Part Plastic Formable Inorganic Coating Obtain from Alkali-Activated Slag/Starch(CMS) Hybrid Composites (Molecules)


14 february 2020 19:03:18

Molecules, Vol. 25, Pages 844: One-Part Plastic Formable Inorganic Coating Obtain from Alkali-Activated Slag/Starch(CMS) Hybrid Composites (Molecules)

Coating technology can be applied to decorate building constructions. Alkali-activated materials (AAM) are promising green and durable inorganic binders which show potential for development as innovative coating. In the paper, the possibility of using AAM composited with starch (CMS) as a novel plastic formable inorganic coating for decorating in building was investigated. The rheological properties, including plastic viscosity, yield stress, and thixotropy were considered to be critical properties to obtain the working requirements. Four different mixtures were systematically investigated to obtain the optimum formulation, and then were used to study their hardened properties, such as mechanical strengths (compressive, flexural, and adhesive strength), drying shrinkage, cracking behavior, and microstructure. Study results found that CMS could quickly and efficiently be hydrolyzed in an alkaline solution to produce organic plastic gel which filled in AAM paste, leading to the significant improvement of coating consistency, plastic viscosity, and thixotropy. The optimum coating composited with 15.40 wt% CMS shows a relatively stable rheological development, the setting time sufficient at higher than 4 h. Furthermore, CMS shows a significant positive effect on the cracking and shrinkage control due to padding effect and water retention of CMS, which results in no visible cracks on the coating surface. Although the mechanical strength development is relatively lower than that of plain AAM, its value, adhesive strength 2.11 MPa, compressive strength 55.09 MPa, and flexural strength 8.06 MPa highly meet the requirements of a relevant standard. Digg Facebook Google StumbleUpon Twitter
10 viewsCategory: Biochemistry, Chemistry, Molecular Biology
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