Grouting the contraction-shrinkage joints of the Andizhan reservoir dam

Argal, É. S.; Ermoshin, V. M.; Zhurkina, N. N.; Korolev, V. M.

doi:10.1007/bf02306141

Cited by 2 publications

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“…Actually, durin 8 grouting of joints of dams the hardened grout in many cases is compressed by forces of of the elastic aftereffect of deformed elements (columnar masses) of the dam, which is indicated by the residual openin 8 of Joints after their grouting [4]. This improves its strength and cohesion with concrete, which can become commensurate with the strength of monolithic concrete, which is confirmed by the presence of whole cores extract from check holes intersecting the joint.…”

Section: Est =-~-~ =R mentioning

confidence: 61%

“…The average modulus of deformation of masonry with grouted joints in compression by stress of more than 1 MPa across the joints can be assumed equal to the modulus of deformation of the concrete. 4. Zones of the mass in the ~mmediate vicinity of the joints have increased deformability, which depends on the maEnltude of stresses and number of loading cycles.…”

Section: Discussionmentioning

confidence: 99%

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Evaluation of the mechanical properties of the mass of a concrete dam with interblock joints

Abadzhyan¹,

Argal²,

Korolev³

1980

Hydrotechnical Construction

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The deformation properties and strength of masonry in compression and tension across interblock (not grouted) and grouted joints are of great interest for studying the stress and strain of a dam. The deformation and strength characteristics of hardened cement obtained in laboratory tests of specimens made of cement grout cannot be used with a sufficient degree of reliability for evaluating the deformability of the zone of the grouted joint, because the conditions of formation and hardening of the specimens do not reflect the real conditions of filling the narrow slits with cement grout, the formation of hardened cement from it, its contact with concrete, and the absorption of the acting load by this hardened cement.It was established in experimental investigations that with consideration of the threedimensional work of the structure the strength (stability) factor of a gravity dam in a gorge is considerably higher than according to the standard calculation of an individual section. It was found in this case that the characteristics of the resistance of a dam in a gorge depend considerably on the properties of the joints [i, 2].The deformability and character of fracture of interblock grouted joints were investigated on plaster-sand and concrete specimens of various sizes and shapes at the research department of the All-Union Planning, Surveying, and Scientific-Research Institute (Gidroproekt) with the participation of its Special Operations Trust (Gidrospetsproekt). Deformations were measured by resistance strain gauges, with a base of 5, I0, 20, 30, and 50 mm, dlal-type in- Fig. I. Concrete specimen-cylinder with an interblock joint prepared for testing.

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Section: Est =-~-~ =R mentioning

confidence: 61%

Section: Discussionmentioning

confidence: 99%

Evaluation of the mechanical properties of the mass of a concrete dam with interblock joints

Abadzhyan¹,

Argal²,

Korolev³

1980

Hydrotechnical Construction

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Sealing the joints of the Andizhan concrete dam

Argal¹,

Ermoshin²

1984

Hydrotechnical Construction

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The sections of the Andizhan concrete buttress dam are separated by contraction joints into elements: I, the upstream head; II, the buttresses; and III, the downstream head [i]. The buttresses of the channel and floodplain sections are separated by an additional joint to a height of 17 m (Fig. i).The contraction joints have a different design over the height.In the foundation zone they are made expanded --to be concreted; higher they pass into vertical and inclined contact joints --to be grouted (Fig. 2); farther the joints have the form of steps 3 m high and 1 m wide. The joints close on the downstream face of the dam. Horizontal keyways, trapezoidal in cross section with a spacing of 1-2 m are provided for in all joints except the closing joints.Deformation joints pass between the upstream heads and along the diaphragm.In addition to these main joints the dam has a number of secondary joints: along the contacts with the poured and keyway concrete in the zone of the conduits, in the plugs of the bottom outlets, in the seals of tectonic zones, etc. To provide normal static work of the dam, the contact joints were grouted. The deformation joints were grouted to impart to the structure the necessary rigidity under the effect of seismic loads. The cavities behind the metal lining of the conduits were also grouted to provide its interaction with the concrete; as were the cavities behind the formwork reinforced panels performing the function of a facing on the outer faces of the dam. The fractured concrete of the structure was sealed by the grout injection method.The joints to be grouted are separated by metal waterbars into segments with an average height of ii m and area of 47 m 2. The stepped joints have an area of 20 m = and the closing joints 84 m 2. The segments are located at different levels and do not form the usual grouting levels owing to the nonuniform construction of the dam sections.Twofold grouting was stipulated in each segment. Horizontal linear outlets (disk-valve outlets were used in the foundation zone of sections 15-27) arranged every 1-2 m and connected by metal pipes with a diameter of 25-32 mm were laid in the joints for primary grouting;i for secondary grouting --horizontal feeder pipes with a diameter of 20-25 mm with valve outlets of various designs.The grouting outlets were connected into the systems according to a loop scheme with two or three feeders. An air-outlet keyway common for both systems was constructed in the upper part of the segment.Mainly precast reinforced-concrete formwork (80%), which became a part of the structure, was used when concreting the dam.The grouting accessories were placed inthe formwork reinforced panels during their manufacture in the yard of the reinforced-concrete products plant. ThE pipes of the grouting systems were coupled by sleeves or welding in the blocks being concrete* and extended into the intersectional cavities of the sections to special metal platforms.

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Grouting the contraction-shrinkage joints of the Andizhan reservoir dam

Cited by 2 publications

References 1 publication

Evaluation of the mechanical properties of the mass of a concrete dam with interblock joints

Evaluation of the mechanical properties of the mass of a concrete dam with interblock joints

Sealing the joints of the Andizhan concrete dam

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