SLUMP TEST

AIMS BROAD OUTCOMES UNDERSTAND THE IMPORTANCE OF WATER CONTENT KNOW WHEN AND WHY A SLUMP TEST IS CARRIED OUT

Trainees will be able to: OBJECTIVES Trainees will be able to: TO DETERMINE SLUMP CLASS OF A CONCRETE SAMPLE DRAW AND LABEL SLUMP CONE APPARATUS CARRY OUT A SLUMP TEST

Slump cone and tamping rod TOOLS NEEDED Slump cone and tamping rod Water proof base Trowel Measuring tape Concrete

TOOLS NEEDED SLUMP CONE AND TAMPING ROD

TOOLS NEEDED WATERPROOF BASE

TOOLS NEEDED WATERPROOF BASE

TOOLS NEEDED TROWEL

TOOLS NEEDED MEASURING TAPES

TOOLS NEEDED CONCRETE

WHAT IS A SLUMP TEST? A SLUMP TEST IS A TEST OF THE WORKABILITY OF CONCRETE

WORKABILITY OF CONCRETE THE WORKABILITY OF CONCRETE IS AFFECTED BY THE AMOUNT OF WATER IN THE MIX TOO MUCH WATER CAN MAKE CONCRETE WEAK NOT ENOUGH CONCRETE CAN MAKE THE CONCRETE TOO HARD TO WORK WITH

WHEN IS A SLUMP TEST CARRIED OUT? A SLUMP TEST IS CARRIED OUT ON SITE BEFORE THE CONCRETE IS POURED IN PLACE . A SAMPLE IS TAKEN FROM THE LORRY WHEN IT ARRIVES ON SITE.

PROCEDURE Place the cone on a level waterproof base Place your feet on the holding down lugs Place 75mm of concrete in the cone and tamp 25times Repeat this action 3 more times until the cone is full and screed off the top

PROCEDURE Gently lift cone from the concrete Area cone beside concrete and put tamping rod across the top of the cone Measure down from bottom of tamping rod to top of concrete The measurement is the slump of the concrete

AVERAGE SLUMPS SLUMP CLASS SLUMP RANGE(MM) WORKABILITY S1 10-40 LOW S2 50-90 MEDIUM S3 100-150 MEDIUM/HIG H

CONCRETE SAMPLE ______ SLUMP CLASS SLUMP RANGE (MM) WORKABILITY

_____mm ______mm

What does a slump test measure? WORKABILITY What affects slump? AMOUNT OF WATER IN MIX How many times do you tamp a 75mm layer of concrete? 25 TIMES