Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Pressure Grouting Fine Fissures
The surface condition of the fissure, the ratio of the maximum grain size of the solids in the grout, the water-cement ratio of the grout and the pressure at which it is pumped all influence the width of crack that can be penetrated. The use of a fine sieve cloth to remove oversized particles from the grout seems warranted. Poor bond between grout film and the top of a crack appeared to be normal because some bleeding almost inevitably occurs with grouts having water-cement ratios practicable to pump. Grout films with water-cement ratios of 0.5 or less bled little and were hard and dense. Setting time increased with increasing water content, and neat grout with a water-cement ratio of 3.8 by weight required ten days to set. The use of fluidifiers allowed some reduction in water-cement ratio that could be forced into a given crack thickness. Their use increased setting time, decreased bleeding, and had little effect on the solubility of the grout film as judged by leaching tests. An approximately straight-line drop in pressure occurred from the intake to the exhaust end of the crack when cracks of 0.02- and 0.03-in. thickness were grouted. With finer fissures the pressure drop was steeper for the first 12 in. than for the remaining 36 in. of crack length. Frequently the solids appeared to have agglomerated in hardened grout films containing fly ash. The use of ground, water-quenched blast-furnance slag, pumicite, and opaline shale appeared to reduce bleeding and improve the appearance of hardened grout films. Resistance of grout films to leaching increased with age and with decreasing water-cement ratio. Ground slag and opaline shale reduced the solubility of grout. (Author)
Pressure Grouting Fine Fissures
The surface condition of the fissure, the ratio of the maximum grain size of the solids in the grout, the water-cement ratio of the grout and the pressure at which it is pumped all influence the width of crack that can be penetrated. The use of a fine sieve cloth to remove oversized particles from the grout seems warranted. Poor bond between grout film and the top of a crack appeared to be normal because some bleeding almost inevitably occurs with grouts having water-cement ratios practicable to pump. Grout films with water-cement ratios of 0.5 or less bled little and were hard and dense. Setting time increased with increasing water content, and neat grout with a water-cement ratio of 3.8 by weight required ten days to set. The use of fluidifiers allowed some reduction in water-cement ratio that could be forced into a given crack thickness. Their use increased setting time, decreased bleeding, and had little effect on the solubility of the grout film as judged by leaching tests. An approximately straight-line drop in pressure occurred from the intake to the exhaust end of the crack when cracks of 0.02- and 0.03-in. thickness were grouted. With finer fissures the pressure drop was steeper for the first 12 in. than for the remaining 36 in. of crack length. Frequently the solids appeared to have agglomerated in hardened grout films containing fly ash. The use of ground, water-quenched blast-furnance slag, pumicite, and opaline shale appeared to reduce bleeding and improve the appearance of hardened grout films. Resistance of grout films to leaching increased with age and with decreasing water-cement ratio. Ground slag and opaline shale reduced the solubility of grout. (Author)
Pressure Grouting Fine Fissures
H. K. Cook (Autor:in) / T. B. Kennedy (Autor:in)
1956
82 pages
Report
Keine Angabe
Englisch
Pressure grouting fine fissures
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