Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Ultra-stable anti-washout cement grout achieved by super water absorbing villus-like nanocomposite hydrogel
Highlights The use of V-NC gel improved the viscosity and washout resistance of underwater cement grout. The V-NC gel retained a villus-like structure in cement supernatant. The villus-like structure of V-NC gel ensured super water absorbing performance in the cement environment. The chemical interaction between V-NC gel and cement hydrates was determined.
Abstract In this paper, super absorbent polymer (SAP) is used as anti-washout admixtures (AWA) to investigate the influence of the swelling property, salt resistance swelling property and chemical interaction of SAP on the washout of underwater cement grout. Herein, a new villus-like nanocomposite hydrogel (V-NC gel), one self-synthesized new SAP, were used to fabricate underwater cement grout with ultra-stable anti-washout performance. Incorporating V-NC gel can significantly reduce underwater cement grout washout loss from 91.05% to 62.22%, which was much better than those of adding commercial water absorbent polyacrylate sodium (PAAS). The villus-like structure of V-NC gel ensured super water absorbing performance in the cement environment, leading to strengthening the anti-washout performance. Further, the –COO− group (from V-NC gel) could chelate with Ca2+ (released from cement hydration) to form a cross-linking network, being conducive to gluing the cement particles, thereby enhancing the anti-washout performance of the cement grout.
Ultra-stable anti-washout cement grout achieved by super water absorbing villus-like nanocomposite hydrogel
Highlights The use of V-NC gel improved the viscosity and washout resistance of underwater cement grout. The V-NC gel retained a villus-like structure in cement supernatant. The villus-like structure of V-NC gel ensured super water absorbing performance in the cement environment. The chemical interaction between V-NC gel and cement hydrates was determined.
Abstract In this paper, super absorbent polymer (SAP) is used as anti-washout admixtures (AWA) to investigate the influence of the swelling property, salt resistance swelling property and chemical interaction of SAP on the washout of underwater cement grout. Herein, a new villus-like nanocomposite hydrogel (V-NC gel), one self-synthesized new SAP, were used to fabricate underwater cement grout with ultra-stable anti-washout performance. Incorporating V-NC gel can significantly reduce underwater cement grout washout loss from 91.05% to 62.22%, which was much better than those of adding commercial water absorbent polyacrylate sodium (PAAS). The villus-like structure of V-NC gel ensured super water absorbing performance in the cement environment, leading to strengthening the anti-washout performance. Further, the –COO− group (from V-NC gel) could chelate with Ca2+ (released from cement hydration) to form a cross-linking network, being conducive to gluing the cement particles, thereby enhancing the anti-washout performance of the cement grout.
Ultra-stable anti-washout cement grout achieved by super water absorbing villus-like nanocomposite hydrogel
Guo, Hongda (Autor:in) / Tang, Ziqing (Autor:in) / Liu, Qing (Autor:in) / Xu, Jianyu (Autor:in) / Wang, Miaomiao (Autor:in) / Liang, Rui (Autor:in) / Sun, Guoxing (Autor:in)
16.06.2021
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
ANTI-WASHOUT UNDERWATER GROUT COMPOSITION, AND ANTI-WASHOUT UNDERWATER GROUT
| Europäisches Patentamt | 2021
Simple Field Tests to Characterize Fluidity and Washout Resistance of Structural Cement Grout
| Online Contents | 1998