Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 301, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2021.124035
Keywords
Anti-washout cement grout; Villus-like nanocomposite hydrogel; Washout loss; Slump flow; Bleeding capacity; Chemical interaction
Categories
Funding
- Science and Technology Development Fund, Macau SAR [0138/2020/A3]
- Multi-Year Research Grant [MYRG2018-00164-IAPME]
- University of Macau [CPG2021-00025-IAPME]
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This study investigates the use of a new villus-like nanocomposite hydrogel (V-NC gel) as an additive for underwater cement grout, significantly improving its anti-washout performance. The villus-like structure of V-NC gel and its chemical interaction with cement particles are the key factors contributing to its effectiveness in enhancing the anti-washout performance.
In this paper, super absorbent polymer (SAP) is used as anti-washout admixtures (AWA) to investigate the in-fluence 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 perfor-mance. 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.
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