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Quality Control for Grouting under Rigid Pavement
A trial pressure grouting program was conducted to restore the load carrying capabilities of Portland cement concrete slabs that have been in service for a number of years and are showing signs of distress. Firstly, a series of lab tests were conducted to find a grout with suitable properties of fluidity, viscosity, stability, shrinkage and strength, and a Portland cement grout with water to cement ratio of 0.8 and an additive of 7% by weight of cement was selected. Secondly, ground penetration radar (GPR) was used to detect possible voids under the slab before grouting, and falling weight deflectometer was used to evaluate the load bearing capacity from slab deflection before grouting. Then trial grouting under the slab was conducted, and the pressure grouting parameters of a maximum flow rate of 3 liters per minute and a maximum injection pressure of 0.5 kg/cm2 were selected throughout the grouting program. To avoid the slab heaving, the elevations at six locations of each slab were closely monitored during grouting. At last, the GPR was used again to evaluate the effectiveness of grout to fill the voids under the slab. In addition, falling weight deflectometer was used to evaluate the effectiveness of restoring the load carrying capability of slab from grouting. This program was successfully conducted and the results of all these test and evaluations are described in this paper.
Quality Control for Grouting under Rigid Pavement
A trial pressure grouting program was conducted to restore the load carrying capabilities of Portland cement concrete slabs that have been in service for a number of years and are showing signs of distress. Firstly, a series of lab tests were conducted to find a grout with suitable properties of fluidity, viscosity, stability, shrinkage and strength, and a Portland cement grout with water to cement ratio of 0.8 and an additive of 7% by weight of cement was selected. Secondly, ground penetration radar (GPR) was used to detect possible voids under the slab before grouting, and falling weight deflectometer was used to evaluate the load bearing capacity from slab deflection before grouting. Then trial grouting under the slab was conducted, and the pressure grouting parameters of a maximum flow rate of 3 liters per minute and a maximum injection pressure of 0.5 kg/cm2 were selected throughout the grouting program. To avoid the slab heaving, the elevations at six locations of each slab were closely monitored during grouting. At last, the GPR was used again to evaluate the effectiveness of grout to fill the voids under the slab. In addition, falling weight deflectometer was used to evaluate the effectiveness of restoring the load carrying capability of slab from grouting. This program was successfully conducted and the results of all these test and evaluations are described in this paper.
Quality Control for Grouting under Rigid Pavement
Ni, James C. (author) / Cheng, Wen-Chieh (author)
GeoHunan International Conference 2011 ; 2011 ; Hunan, China
Pavements and Materials ; 183-191
2011-05-16
Conference paper
Electronic Resource
English
Quality Control for Grouting under Rigid Pavement
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