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A platform for research: civil engineering, architecture and urbanism
Performance enhancement and mechanism of pregelatinized starch–binding gypsum at high water–gypsum ratios
https://orcid.org/0000-0002-2650-8166
https://orcid.org/0009-0001-2596-2295
https://orcid.org/0000-0001-6691-7952
Highlights A pregelatinized starch-binding gypsum was prepared to mimic the historic binders. The gypsum strength is enhanced by pregelatinized starch-binding gypsum structure at high w/c ratios. The contact points stress enhancement promotes macro strength enhancement. Hydrogen bonding plays a key role in constructing the pregelatinized starch–binding gypsum structures.
Abstract Minimizing gypsum powder usage by increasing water to gypsum (w/c) ratios has both economic and environmental benefits. However, gypsum is limited in application by its poor mechanical strength at high w/c ratios. To enhance the strength of hardened gypsum at high w/c ratios, this paper proposes a pregelatinized starch–binding gypsum structure. The mechanical strength, working abilities, and microstructure of pregelatinized starch–binding gypsum samples at high w/c ratios were evaluated. And the micro-nano structure and enhancement mechanism of pregelatinized starch–modified gypsum was investigated. The results show that at high w/c ratios from 0.8 to 1.0, pregelatinized starch significantly improved the mechanical properties of gypsum, where the flexural and compressive strength of 3 d modified drying sample were 3.3 MPa and 6.6 MPa in comparison to pure gypsum samples tending to 0 MPa. Pregelatinized starch participates in the overlapping structure of gypsum crystals and bind to them without affecting the crystal structure and morphology of single particles. The nanostructure of modified contact points involved strong adsorption of pregelatinized starch onto the (120) face by hydrogen bonding, which enhanced binding adhesion at contact points. And pregelatinized starch effectively reduced separation of the (120) face under x– and z– tensile stretching, and slipping along the (010) face under y– tensile stretching. This paper presents a modification that enhances mechanical properties of gypsum at high w/c ratios, and provides deeper understanding of crystal overlapping mechanisms at the nanoscale.
Performance enhancement and mechanism of pregelatinized starch–binding gypsum at high water–gypsum ratios
https://orcid.org/0000-0002-2650-8166
https://orcid.org/0009-0001-2596-2295
https://orcid.org/0000-0001-6691-7952
Highlights A pregelatinized starch-binding gypsum was prepared to mimic the historic binders. The gypsum strength is enhanced by pregelatinized starch-binding gypsum structure at high w/c ratios. The contact points stress enhancement promotes macro strength enhancement. Hydrogen bonding plays a key role in constructing the pregelatinized starch–binding gypsum structures.
Abstract Minimizing gypsum powder usage by increasing water to gypsum (w/c) ratios has both economic and environmental benefits. However, gypsum is limited in application by its poor mechanical strength at high w/c ratios. To enhance the strength of hardened gypsum at high w/c ratios, this paper proposes a pregelatinized starch–binding gypsum structure. The mechanical strength, working abilities, and microstructure of pregelatinized starch–binding gypsum samples at high w/c ratios were evaluated. And the micro-nano structure and enhancement mechanism of pregelatinized starch–modified gypsum was investigated. The results show that at high w/c ratios from 0.8 to 1.0, pregelatinized starch significantly improved the mechanical properties of gypsum, where the flexural and compressive strength of 3 d modified drying sample were 3.3 MPa and 6.6 MPa in comparison to pure gypsum samples tending to 0 MPa. Pregelatinized starch participates in the overlapping structure of gypsum crystals and bind to them without affecting the crystal structure and morphology of single particles. The nanostructure of modified contact points involved strong adsorption of pregelatinized starch onto the (120) face by hydrogen bonding, which enhanced binding adhesion at contact points. And pregelatinized starch effectively reduced separation of the (120) face under x– and z– tensile stretching, and slipping along the (010) face under y– tensile stretching. This paper presents a modification that enhances mechanical properties of gypsum at high w/c ratios, and provides deeper understanding of crystal overlapping mechanisms at the nanoscale.
Performance enhancement and mechanism of pregelatinized starch–binding gypsum at high water–gypsum ratios
https://orcid.org/0000-0002-2650-8166
https://orcid.org/0009-0001-2596-2295
https://orcid.org/0000-0001-6691-7952
Highlights A pregelatinized starch-binding gypsum was prepared to mimic the historic binders. The gypsum strength is enhanced by pregelatinized starch-binding gypsum structure at high w/c ratios. The contact points stress enhancement promotes macro strength enhancement. Hydrogen bonding plays a key role in constructing the pregelatinized starch–binding gypsum structures.
Abstract Minimizing gypsum powder usage by increasing water to gypsum (w/c) ratios has both economic and environmental benefits. However, gypsum is limited in application by its poor mechanical strength at high w/c ratios. To enhance the strength of hardened gypsum at high w/c ratios, this paper proposes a pregelatinized starch–binding gypsum structure. The mechanical strength, working abilities, and microstructure of pregelatinized starch–binding gypsum samples at high w/c ratios were evaluated. And the micro-nano structure and enhancement mechanism of pregelatinized starch–modified gypsum was investigated. The results show that at high w/c ratios from 0.8 to 1.0, pregelatinized starch significantly improved the mechanical properties of gypsum, where the flexural and compressive strength of 3 d modified drying sample were 3.3 MPa and 6.6 MPa in comparison to pure gypsum samples tending to 0 MPa. Pregelatinized starch participates in the overlapping structure of gypsum crystals and bind to them without affecting the crystal structure and morphology of single particles. The nanostructure of modified contact points involved strong adsorption of pregelatinized starch onto the (120) face by hydrogen bonding, which enhanced binding adhesion at contact points. And pregelatinized starch effectively reduced separation of the (120) face under x– and z– tensile stretching, and slipping along the (010) face under y– tensile stretching. This paper presents a modification that enhances mechanical properties of gypsum at high w/c ratios, and provides deeper understanding of crystal overlapping mechanisms at the nanoscale.
Performance enhancement and mechanism of pregelatinized starch–binding gypsum at high water–gypsum ratios
Wang, Jingchen (author) / Xu, Qingyuan (author) / Qin, Ji (author) / Wu, Qisheng (author) / Zhu, Huajun (author) / Lu, Bao (author) / Zhu, Zheyu (author)
2023-06-11
Article (Journal)
Electronic Resource
English
METHOD OF WATER DISPERSING PREGELATINIZED STARCH IN MAKING GYPSUM PRODUCTS
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