BS EN 934-6 pdf free download

BS EN 934-6 pdf free download.Admixtures for concrete, mortar and grout.
4.2 Sampling from the manufacturer’s stock
4.2.1 General
Each sample shall represent not more than one batch. For continuous production of an admixture, one sample taken from up to 25 t may be regarded as representative.
4.2.2 Powder admixture (in packages)
The sample shall be composed of sub-samples from 6 packages (bags) or if the total number of packages (bags) is less than 6, from all packages (bags). The sub-samples are to be taken from packages (bags) distributed at random throughout the consignment.
One of the following procedures shall be applied:
a) where the packages contain up to 500 g, take all the contents of each package;
b) where the packages contain more than 500 g, use one of the following methods:
1) insert a sampling tube, which takes a core not less than 25 mm in diameter, into the packages so that it takes a core of the material from substantially the entire length of the package;
2) empty one of the packages to be sampled on to a clean dry surface and mix the material. Take at least three portions of not less than 125 g each from different parts of the heap.
The method given in 1) is the preferred method, but if a sampling tube is not available, the method given in 2) shall be used.
Repeat the procedure with each of the other packages to be sampled and thoroughly mix the sub- samples obtained to form one bulk sample. If the bulk sample exceeds 3 kg, it shall be reduced to 3 kg, either by coning and quartering or by use of a sample splitter.
Divide the sample into three equal parts and place each part in a clean, air tight, labelled container. At least one container holding 1 kg shall be kept for future reference. Store container(s) in a place that is protected from moisture, heat and light for one year or until the use-by date, whichever is the shorter period.
4.2.3 Liquid admixture
4.2.3.1 General
In order to achieve representative samples of liquid admixtures, one of the following procedures shall be applied.
4.2.3.2 Sampling of a liquid admixture from containers
The sample shall be composed of sub-samples taken from 6 containers or if the total number of containers is less than 6 from all containers. The sub-samples are to be taken from containers distributed at random throughout the consignment.
Agitate the admixtures in the containers to disperse all lightly settled material. Disregard all deposits which are not readily brought into suspension by such agitation.
Without delay, take sub-samples from the selected containers by one of the following procedures:
a) where containers hold up to 0,5 1, take the total contents;
b) where containers hold more than 0,5 1 take 0,5 1 of the liquid from each container, combine the sub- samples obtained in this way and mix them thoroughly to form one bulk sample.
4.2.3.3 Sampling of a liquid admixture from a tank load
When the load is agitated, one sample may represent the entire tank load of up to 25 000 1. The bulk sample shall be at least 3 1.
Otherwise, three samples shall be taken as follows: one from the top level, one within ± 300 mm of the mid-level of the fluid and one within 400 mm of the bottom of the tank. Each sample shall be not less than 11. Thoroughly mix the three samples until they form one homogeneous bulk sample.
4.2.3.4 Division of sample
The bulk sample obtained by one of the procedures described above (42.3.2 or 4.2.3.3) shall be divided into 3 equal samples. Place in three clean bottles, label and tightly stopper. At least one bottle shall be kept for future reference for one year or until the use-by date, whichever is the shorter period.
Store the bottle(s) in a place that is protected from heat, frost and light.
4.3 Sampling at delivery
When sampling of a consignment of an admixture is required, the sampling shall be carried out before unloading at the point and time of delivery.BS EN 934-6 pdf download.