For independent projects with shotcrete less than 500m2, there shall be at least one group, and each group of test blocks shall not be less than 3.
When materials or mix proportions are changed, another group shall be made.
For the cast-in-place pile with the requirement of impermeability grade, the impermeability grade test specimen shall be retained, and one grading shall not be less than 3 groups.
During the pile forming process of 01CFG pile (JGJ79-2012) in the foundation treatment stage, samples shall be taken to make a mixture test block, and each machine shall not be less than one group per shift.
2.
Mass raft (slab thickness greater than 1m) 01 (1) Standard curing test block (GB50496-2018) When the mass concrete with the same mix ratio and no more than 1000m3 is poured continuously at one time, the on-site sampling of concrete strength test pieces shall not be less than 10 groups.
When the mass concrete of more than 5000m3 with the same mix proportion is poured continuously at one time, for the concrete of more than 5000m3, no less than one group shall be sampled for each additional 1000m3, and one group shall be sampled for each additional 1000m3.
(Core can also be taken on site) The test pieces for concrete strength inspection of 04 row piles (GB50202-2018) shall be randomly selected at the construction site.
For single column and single pile, at least one group of test pieces shall be reserved for each pile.
(Standard curing test block) 03 For strength test of cement soil wall (GB51004-2015) slurry test block, the slurry of cement soil mixing pile that has just been mixed and has not yet solidified shall be extracted.
As a permanent structure, the impermeability quality standard of the diaphragm wall can be implemented according to the current national standard Code for Acceptance of Underground Waterproofing Engineering Quality GB50208.
At least one group of concrete strength test pieces must be reserved for every 50m3 of cast-in-place piles.
At least one group of samples shall be taken for each two consecutive floors; No less than one group shall be sampled for every 2000m3.
Three cement soil test blocks shall be made at each sampling point.
At least 2 sampling points shall be set for each pile.
For piles with single pile less than 50m3, at least one group of concrete strength test pieces must be reserved for every 12h of continuous pouring.
04 Two groups of test blocks with the same conditions (GB50666-2011) for winter construction.
(Standard curing test block) III.
04 Two groups of test blocks with the same conditions (GB50666-2011) for winter construction..
02 A group of 6 impermeable test pieces shall be reserved for every 500m3 of continuously poured concrete of impermeable test block (GB50208-2011), and each project shall not be less than two groups; For the impermeability test piece of ready mixed concrete, the number of groups retained shall be determined according to the scale and requirements of the structure; 03600 ℃ · d Test blocks under the same conditions (GB50204-2015) The number of curing test pieces under the same conditions with the same strength grade should not be less than 10 groups, and should not be less than 3 groups.
(Standard curing test block) II.
(Standard curing test block) 02 underground diaphragm wall (GB50202-2018) concrete compressive strength and impermeability grade shall meet the design requirements.
(Standard curing test block) 05 For shotcrete (GB50086-2015), the test pieces required for testing the compressive strength of shotcrete shall be prepared during the construction of the project.
Sampling points shall be set in the mixing pile within 1m above the pit bottom and the weakest soil layer above the pit bottom.
The compressive strength test block of wall concrete shall not be less than 1 group per 100m3 of concrete, and each groove section shall not be less than 1 group, with 3 pieces for each group; The impermeability test block of wall concrete shall not be less than one group for every five groove sections, with six pieces for each group.
For common raft (slab thickness less than 1m) 01 standard curing test block (GB50204-2015), the sampling and retention of test pieces for concrete with the same mix ratio shall comply with the following provisions: sampling shall not be less than once for every 100 plates and no more than 100m3; When less than 100 plates are mixed in each working shift, sampling shall not be less than once; When continuous pouring exceeds 1000m3, sampling shall not be less than once every 200m3; Each floor shall be sampled at least once; At least one set of test pieces shall be retained for each sampling.
(Standard curing test block) IV.
Raft foundation stage 1.
For the concrete from the same mixing plant, at least one group of test pieces must be reserved for every 50m3 of pouring; When the concrete pouring amount is less than 50m3, at least one group of test pieces must be reserved every 12h of continuous pouring.
02 A group of 6 impermeable test pieces shall be reserved for every 500m3 of continuously poured concrete of impermeable test block (GB50208-2011), and each project shall not be less than two groups; For the impermeability test piece of ready mixed concrete, the number of groups retained shall be determined according to the scale and requirements of the structure; 03600 ℃ · d Test blocks under the same conditions (GB50204-2015) The number of curing test pieces under the same conditions with the same strength grade should not be less than 10 groups, and should not be less than 3 groups.
1、 During the foundation pit support stage, the number of test blocks for 01 anchor bolt (GB50330-2013) slurry strength inspection shall not be less than one group for every 30 anchor bolts, and each group of test blocks shall not be less than 6.
The test pieces for concrete strength inspection of cast-in-place piles in pile foundation stage 01 (GB50202-2018) shall be randomly selected at the construction site.
The number of test blocks shall be one group for every 500m2 of shotcrete.
The test quantity and method: 1 pile shall be sampled for each shift.
When pouring 1000m3~5000m3 of mass concrete with the same mix proportion continuously at one time, for the concrete exceeding 1000m3, no less than one group shall be sampled for each additional 500m3, and one group shall be sampled for each additional 500m3.
At least one group of samples shall be taken for each two consecutive floors; No less than one group shall be sampled for every 2000m3.
