The cement used for decoration shall be tested for stability.
4) The entrusting unit must fill in the inspection entrustment form item by item, such as the name of the cement manufacturer, trademark, cement variety, strength grade, factory number or date of manufacture, project name, a full set of physical inspection items, etc.
The construction supervisor knows the information of the construction industry in real time and more in-depth good articles.
Double the re inspection of unqualified items.
Rules for cement sampling and sampling 1) first of all, it is necessary to know whether the manufacturer of the purchased cement has a product production license.
3、 Standard for foundation backfill sampling: Standard for geotechnical test methods (2007 Edition) gb/t50123-1999 (2007 Edition) (implemented on October 1, 1999, currently effective); Highway engineering quality inspection and Evaluation Standard Volume I civil engineering jtgf80/1-2004 (implemented on January 1, 2005, currently valid) construction note: highway engineering quality inspection and Evaluation Standard Volume I civil engineering jtgf80/1-2017 will be implemented on May 1, 2018.
For stones, approximately 15 equal samples are taken from each part (five different parts are evenly distributed at the top, middle and bottom of the pile) to form a group of samples.
Cement sampling regulations 1) cement shall be numbered and sampled according to the same type and strength grade before leaving the factory.
2) When there is doubt about the quality of cement in use or the cement leaves the factory for more than three months (fast hardening portland cement for more than one month), it should be re inspected and used according to the re inspection results.
1.
Source of attention: construction software I.
Before backfilling, the backfilling materials shall be retrieved on site for compaction test, and the soil samples taken shall be representative.
6) Imported cement shall be carried out in accordance with the above requirements.
After mixing evenly, they shall be packed in moisture-proof containers, with a weight of not less than 12 kg.
Note: when sampling cement, the corresponding factory certificate of cement shall be attached.
The sampling point shall be at least 20 points.
Then, for sand, approximately 8 equal parts are taken from each part to form a group of samples.
The cement factory number is specified as: A, 200 according to the annual production capacity × Above 104t, not more than 4000t is a number; B、120 × 104t～200 × 104t, no more than 2400t is a number; C、60 × 104t～120 × 104t, no more than 1000t is a number; D、30 × 104t～60 × 104t, no more than 600t is a number; E、10 × 104t～30 × 104t, no more than 400t is a number; F、10 × Below 104t, not more than 200t is a number.
Bagged cement and bulk cement shall be numbered and sampled respectively.
The sampling amount of compactness shall meet the following requirements.
When the quality of sand and gravel is relatively stable and the feeding amount is large, 1000t can be used as an acceptance batch.
One group is selected for other 50m2 ~ 200m2..
1 Amendment) gb175-2007/xg1-2009 (implemented on September 1, 2009, currently effective); Nomenclature, definition and terminology of cement gb/t4131-2014 (implemented on February 1, 2015, currently valid); Cement sampling method gb12573-2008 (implemented on August 1, 2008, effective at present) 1.
Indoor backfilling: ditch and foundation, one group for each layer of 20m2 ~ 50m2; D.
Remove the surface layer of the sampling part before sampling.
The standard for sampling sand and stone: Pebble and gravel for construction gb/t14685-2011 (implemented on February 1, 2012, currently valid); Sand for construction gb/t14684-2011 (implemented on February 1, 2012, effective at present) 1) for sand and stone transported by large tools, 400m3 or 600t shall be regarded as an acceptance batch.
Those less than the above quantity shall be regarded as one batch.
5) The cement shall be reinspected before being used if the ex factory date exceeds three months.
For those transported by small tools, 200m3 or 300t shall be regarded as an acceptance batch.
(Stone: 100kg, sand: 50kg) 3) if it fails to pass the inspection, it should be re sampled.
Each number is a sampling unit.
When the capacity of bulk cement transportation tools exceeds the tonnage specified by the factory, the quantity of this number is allowed to exceed the tonnage specified by sampling.
Site leveling: one group is selected for each layer of 100m2 ~ 400m2; B.
A.
basis standard for cement witness sampling: General Portland cement (National Standard No.
II.
(clay: 30kg; gravel soil and graded gravel: 50kg) 2.
2) Cement entrusted inspection samples must take each ex factory cement number as a sampling unit, and there must be no mixed sampling of more than two ex factory numbers.
3) Cement samples must be collected in equal quantities at different parts with the same number.
2.
Separate foundation pit: 20m2 ~ 50m2, take 1 group, and not less than 1 group; C.
If one sample still fails to meet the standard requirements, it shall be treated as nonconforming product.
2) When sampling in the stockpile, the sampling parts shall be evenly distributed.
