What is an acceptable slump test?
Table of Contents
What is an acceptable slump test?
Very dry mixes having slump 0 – 25 mm are typically used in constructing pavements or roads, low workability mixes having slump 10 – 40 mm are typically used for foundations with light reinforcement, medium workability mixes with slump 50 – 90 mm, are typically used for normal reinforced concrete placed with vibration.
What is the minimum slump value?
What is the ideal value of slump? Answer 1 In case of a dry sample, slump will be in the range of 25-50 mm that is 1-2 inches. But in case of a wet concrete, the slump may vary from 150-175 mm or say 6-7 inches.
What are the limitations of slump test?
Limitation of Slump Test It is not suitable for a concrete in which maximum size of aggregate exceeds 40 mm. There are chances of many shapes of slump to occur and it is difficult to decide which is the correct value. The slump occurs only in case of plastic mixes.
What is maximum slump?
Unless otherwise permitted or specified, the concrete should be proportioned and produced to have a slump of 4 inches or less if it’s to be consolidated by vibration. If it’s consolidated any other way, the slump should be 5 inches or less.
How much time is allowed for lifting the slump mold?
22 Cards in this Set
| The slump test is applicable to plastic concrete with a maximum size aggregate of _____ | 1 1/2″ |
|---|---|
| When raising the slump mold, it should not be rotated or twisted | True |
| How much time is allowed for lifting the slump mold? | 5 seconds +- 2 seconds |
What is a good slump?
Slump is the measure of concrete consistency and fluidity. It shows the flow and overall workability of freshly mixed concrete. Simply put, the higher the slump, the wetter the mix. Four-inch (4”) slump is very common with normal weight concrete and is a good for pumping.
What is the recommended slump for RCC work?
Explanation: According to IS 456-2000, the slump value (in mm) of the concrete used in ordinary RCC work for beams and slabs, etc. is 50 to 100 mm. For concrete work, low workable concrete is preferred.
What is the best slump for concrete slab?
A good slump for most flatwork placed by hand: five inches. For slabs struck off with mechanical equipment: two to four inches.
What is zero slump What are the disadvantages of slump test?
It cannot differentiate in workability of stiff mixes as it shows zero slumps. In dry range, no difference can be detected between different mixes with different workability. It is not suitable for concrete formed of aggregate higher than 40 mm.
How many types of slump tests are there?
There are three types of slump that may occur in a slumps test, namely, true slump, shear slump and collapse slump.
What is the minimum slump for reinforced foundation walls and footings?
25 – 75
The standard ACI mix design procedure can be divided up into 8 basic steps: Choice of slump. Maximum aggregate size selection. Mixing water and air content selection….Slump.
| Type of Construction | Slump | |
|---|---|---|
| Reinforced foundation walls and footings | 25 – 75 | 1 – 3 |
| Plain footings, caissons and substructure walls | 25 – 75 | 1 – 3 |
How long should a slump test take?
Pull cone straight up with no twisting taking anywhere from 3 to 7 full seconds (specs say 5 seconds +/- 2). Measure slump from the top of the mold to the displaced original center of the concrete. Record results to the nearest 1/4-inch. Begin and complete slump test within 2-1/2 minutes, maximum.
What is the slump test?
This test is also known as the slump cone test. Slump test measures the consistency or workability of concrete. It is used to check the workability of freshly made concrete for the easy placement of concrete. This test indicates the water-cement ratio and the properties of materials and also admixture etc.
What is the maximum permitted slump in concrete?
Maximum Permitted Slump When Slump Isn’t Specified. Unless otherwise permitted or specified, the concrete should be proportioned and produced to have a slump of 4 inches or less if it’s to be consolidated by vibration. If it’s consolidated any other way, the slump should be 5 inches or less. A tolerance of up to 1 inch above…
What is the Plus and minus tolerance of slump?
slump, the concrete slump as delivered would have to fall between 11⁄ 2 and 3 inch-es. If the specified maximum slump is greater than 3 inches, the plus tolerance is still zero and the minus tolerance is 21⁄ 2 inches. For a 5-inch-maximum, the con-crete slump as delivered would have to fall between 21⁄ 2 and 5 inches.
What are the ASTM standards for concrete slump testing?
The ASTM standards also regulate the rigidity of the cone. It states in the procedure that when the cone is removed, it should be lifted up vertically, without any rotational movement at all. The concrete slump test is known as “Standard Test Method for Slump of Hydraulic-Cement Concrete” and carries the code (ASTM C 143) or (AASHTO T 119).