Abstract
Waste sediment generated during tunnel construction is applied to prepare synchronous grouting material, where the influences of fly ash, slag powder, and bentonite on the rheological properties (such as consistency, fluidity, setting time, drainage rate, and stone rate) are studied. The results show that adding fly ash content increases the initial consistency, setting time, and fluidity of grouting material, but also increases its drainage rate and decreases its stone rate. The addition of slag powder results in a slight increase in the setting time and fluidity of the grouting material, yet a decrease in the initial consistency value. In contrast, with the addition of bentonite, both the initial consistency and fluidity of the grouting material decrease. Finally, the optimal mix ratio of high-performance and low-cost grouting materials is fixed to be 30% fly ash, 50% slag powder, and 10% bentonite. Therefore, the fluidity of grouting material can be 170 mm, with an initial consistency of 122 mm, setting time of 1050 min, stone rate of 96.2%, drainage rate of 1.5%, and 28-day compressive strength of 8.3 MPa.
Highlights
During tunnel construction, synchronous grouting is used to closely connect the stratum and segment lining to ensure the safety of the segment lining
Cementbased grouting material, which is made of cement, fly ash, bentonite, and other materials, is well researched and commonly used in tunnel construction [2,3]
S. et al [8] developed a two-liquid plastic shield tunnel synchronous grouting material composed of fly ash, cement, water glass series, and bentonite, and analyzed the workability, stability, gel properties, and strength of each component of the grouting material in relation to the slurry
Summary
Synchronous grouting is used to closely connect the stratum and segment lining to ensure the safety of the segment lining. J. et al [7] explored the influence of the composition, content of sand, and plasticity index of the shield tunnel on the performance of grouting material They found that shield waste sediment can completely replace the bentonite in traditional synchronous grouting material. S. et al [8] developed a two-liquid plastic shield tunnel synchronous grouting material composed of fly ash, cement, water glass series, and bentonite, and analyzed the workability, stability, gel properties, and strength of each component of the grouting material in relation to the slurry. The influences of fly ash, slag powder, and bentonite content on consistency, fluidity, and water dispersion performance resistance are studied, which provides key technological and theoretical support for the recycling of waste sediment in tunnel construction
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
