What is bearing grouting material specification

Bearing grouting material specification pedestal grouting type bearing grouting material with pedestal grouting material ( M50 non-shrinkage mortar liquidity, good liquidity) And bearing mortar ( M50 harsh non-shrinkage mortar, does not have fluidity) 。 A, implement standard base of science and technology' 2005 】 101 passenger railway bridge pot rubber bearing interim technical conditions 1 second, the detailed index. Due to the high speed rail viaduct have prefabrication simply-supported box girder, the cast-in-place beam, the multi-plate T beam, according to the three beams, bearing grouting material series materials perform different performance requirements. 2. 2. 1 the pot rubber bearing plant for the simple box girders of prefabricated gravity grouting with grouting material ( Bearing grouting material, M50 liquidity non-shrinkage mortar) Shall meet the following requirements: the performance of the compressive strength of 28 days of no less than 50 mpa, 56 d and 90 d after strength don't reduce; The elastic modulus of 28 days of no less than 30 gpa; 24 hours of flexural strength is greater than or equal to 10 mpa; Slurry water cement ratio should not be greater than zero. 34, and shall not be bleeding, fluidity, 320 mm, or after 30 min flow should not be less than 240 mm; Blade body under the standard curing condition, 28 d expansion rate is 0. 02 ~ 0. 1%. When have special requirements, grouting material can be used early strength, rapid hardening materials under normal temperature conditions, the compressive strength of grouting material 2 h should not be less than 20 mpa, 56 d compressive strength should not be less than 50 mpa. 2. 2 cast-in-place girder bridge pot rubber bearing gravity grouting with grouting material ( Bearing grouting material, M50 liquidity non-shrinkage mortar) Performance shall meet the following requirements: 8 hours of not less than 20 mpa compressive strength, the compressive strength of not less than 12 hours a day 25 mpa, 24 hours of not less than 40 mpa compressive strength, the compressive strength of 28 days of no less than 50 mpa, 56 d and 90 d after strength don't reduce; The elastic modulus of 28 days of no less than 30 gpa; 24 hours of the flexural strength is greater than or equal to 6 mpa, the flexural strength of 28 days is greater than or equal to 8 mpa, 56 days of flexural strength is greater than or equal to 10 mpa; May not be exudation, fluidity, 220 mm, or initial setting acuity 30 min, final set 3 h or less; Shrinkage rate: < 2%, inflation: 0 or higher. 1%; 2. 3 precast multi-plate T beam pot rubber bearing with M50 harsh non-shrinkage mortar ( Bearing mortar) Performance shall meet the following requirements: 8 hours of not less than 25 mpa compressive strength, the compressive strength of 28 days of no less than 50 mpa, 56 d and 90 d after strength don't reduce; The elastic modulus of 28 days of no less than 30 gpa; 24 hours of flexural strength is greater than or equal to 10 mpa; Blade body under the standard curing condition, 28 d expansion rate is 0. 02 ~ 0. 1%. Grouting material is bearing more than three, summary of the specifications, according to different beam, specification, Execution standard) There will be some difference, client or project material purchasing department, please indicate the beam type ( Consulting Li Gong - when necessary 15838304411). ！