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A substantial wave velocity decrease, as much as 47.7% at certain frequencies, was recorded in rock bolts grouted in fully cured concrete in comparison to non-grouted bolts.
There were cakes of all kinds, cored with red bean and custard, crusted in sugar, slit down the middle and grouted in cream.
Each specimen was grouted in a 200 mm diameter concrete cylinder, which was designed with different compressive strength.
Many anchor bolt installations have the bolt grouted in with only 2-4 in. of free length.
However in civil engineering, cables are often buried or grouted in large solid media that can be considered as unbounded.
This paper presents results of an experimental study into the effects of curing time and testing frequency on the velocity of ultrasonic waves propagating along rock bolts grouted in concrete.
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Open image in new window Fig. 11 Borehole layout pattern for grouting in belt driving chamber of the Chengzhuang coal mine, Jincheng.
To date, opportunities for testing the quality of the grout in grouted rock bolts have been limited to the pull-out tests and the over-coring methods.
During cold weather precast wall construction, in-situ heating of the grout used in grouted dowel connections is usually conducted for short periods of time.
In Sweden in the swells of environmental catastrophe involving acrylamide based grouting material in Hallandsås tunnel environmental compatibility of grouting material is highly prioritized.
The amount of grouting varies in accordance with purposes.
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