Final answer:
In a slump test, concrete is sourced from a cement mixer that pumps it to the construction site, ensuring the concrete has the right consistency for use.
Step-by-step explanation:
When performing a slump test, the concrete being tested comes from a batch that is being prepared for actual use in construction, typically pumped from a cement mixer to the location where it is to be laid. This is done to ensure the concrete has the proper consistency and workability required for the specific construction job. The slump test is an empirical test that measures the workability or consistency of concrete in that it provides an indication of the concrete's ability to be placed, as well as its stability and consolidation.
When performing a slump test, the concrete being tested typically comes from a sample collected from the construction site. A slump test is conducted to measure the consistency of the concrete and its workability. A small portion of the freshly mixed concrete is collected in a metal cone, and then the cone is lifted vertically. The cone is removed, and the amount the concrete slumps is measured. This measurement helps determine the water content and the level of compaction of the concrete.