BS 1881-102 Testing concrete — Part 102: Method for determination of slump


This Part of this British Standard describes a
method for determining of slump of cohesive
concrete of medium to high workability. 

The method
applies to plain and air-entrained concrete, made
with lightweight, normal weight or heavy
aggregates having a nominal maximum size
of 40 mm or less but not to aerated concrete and
no-fines concrete. 

NOTE The titles of the publications referred to in this standard
are listed on an inside back cover.

Preparing the sample for test 

Empty the sample from the container(s) onto the
sampling tray. Ensure that no more than a light
covering of slurry is left adhering to the
Thoroughly mix the sample by shovelling it to form
a cone on the sampling tray and turning this over
with the shovel to form a new cone, the operation
being carried out three times.
 When forming the
cones deposit each shovelful of the material on the
apex of the cone so that the portions which slide
down the sides are distributed as evenly as possible
and so that the centre of the cone is not displaced. 
Flatten the third cone by repeated vertical insertion
of the shovel across the apex of the cone, lifting the
shovel clear of the concrete after each insertion.
CAUTION. When cement is mixed with water,
alkali is released. Take precautions to avoid dry
cement entering the eyes, mouth and nose when
mixing concrete. 
Prevent skin contact with wet
cement or concrete by wearing suitable protective
clothing. If cement or concrete enters the eye,
immediately wash it out thoroughly with clean
water and seek medical treatment without delay. 
Wash wet concrete off the skin immediately.

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