A novel water-swelling grouting material formulation and its performance for water rushing in karst strata.
In: Construction & Building Materials, Jg. 416 (2024-02-16), S. N.PAG
academicJournal
Zugriff:
Conventional grouting materials often exhibit shortcomings when faced with water rushing in karst strata, such as easy dispersion, poor stability, and uncontrollable diffusion. This study introduces an organic-inorganic hybrid water-swelling material for grouting based on excellent synergistic interactions among Polymethylene Polyphenyl Isocyanate (PAPI), Nitrogen tetroxide (N204), Portland cement, and Triethylenediamine (A33) using a straightforward process. Meanwhile, optimal formulations for the WSGM are determined using a proposed matrix analysis model. Under specific conditions with an alcohol ester ratio of 0.9, cement content of 50 %, and catalyst content of 50 %, the resulting water-swelling grouting material (WSGM) exhibits a three-dimensional network structure, high viscosity, exceptional stability, and robust scour resistance (with an initial expansion time of 11 s, a gel time of 91 s, a volume expansion rate of 600 %, a compressive strength of 0.62 MPa, and a bonding strength of 0.39 MPa). The excellent performance of the WSGM is validated through a series of experimental tests. The potential formation mechanisms were discussed, considering the hardening process, X-ray diffraction (XRD) analysis, and scanning electron microscopy (SEM) analysis. This research holds the potential to advance the development of organic-inorganic hybrid water-swelling materials with excellent performance, opening new avenues in material preparation. • An organic-inorganic hybrid water-swelling grouting material (WSGS) for karst strata is proposed. • A matrix analysis model for determining optimal formulations of the WSGS is presented. • Recommended formulations for the WSGS include an alcohol ester ratio of 0.9 with cement and catalyst each at 50 %. • Optimized WSGS formulations in laboratory model tests show superior grouting quality. [ABSTRACT FROM AUTHOR]
Titel: |
A novel water-swelling grouting material formulation and its performance for water rushing in karst strata.
|
---|---|
Autor/in / Beteiligte Person: | Zhang, Cong ; Zhou, Jinxin ; Zheng, Xiangcou ; Yang, Junsheng ; Zhan, Shuangqiao ; Yang, Lei |
Link: | |
Zeitschrift: | Construction & Building Materials, Jg. 416 (2024-02-16), S. N.PAG |
Veröffentlichung: | 2024 |
Medientyp: | academicJournal |
ISSN: | 0950-0618 (print) |
DOI: | 10.1016/j.conbuildmat.2024.135245 |
Schlagwort: |
|
Sonstiges: |
|