What is a good slump test result?
What is a good slump test result?
The slump test is suitable for slumps of medium to low workability, slump in the range of 5 – 260 mm, the test fails to determine the difference in workability in stiff mixes which have zero slump, or for wet mixes that give a collapse slump. It is limited to concrete formed of aggregates of less than 38 mm (1.5 inch).
What is the normal range of slump values?
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.
Which slump value is good for concrete?
5. observation and recording
| Workability | Compaction Factor | Slump (mm) |
|---|---|---|
| Very Low | 0.78 | 0 – 25 |
| Low | 0.85 | 25 – 50 |
| Medium | 0.92 | 50 – 100 |
| High | 0.95 | 100 – 175 |
How do you calculate slump?
Place a straight edge, preferably the tamping rod, across the slump mold base, with one end suspended over the pile of concrete. Using a tape or ruler, measure the distance from the bottom of the straight edge to the displaced center of the slumped concrete. Record your results to the nearest 1/4 of an inch.
What is the slump of m25 grade concrete?
Mix is stable, cohesive, and workable and had a true slump of about 75 mm. So , it has achieved desired workability by satisfying the requirement of 50-75 mm slump value .
What does 0 mm slump mean?
We can classify the result within some ranges according to the slump value. Very low workability: slump value 0-25mm or 0-1 inch. Low workability: slump value 25-50mm or 1-2 inch. Medium workability: slump value 50-100mm or 2-4 inch. High workability: slump value 100-175mm or 4-7 inch.
What is slump value for M20 concrete?
between 100 and 160 mm
workability for M20 grade of normal concrete was achieved due to the 0.5 water-cement ratio and 2% super plasticizer. The range of slump value was in between 100 and 160 mm and it is illus- trated in Table 3.
What is M25 ratio?
M25 grade concrete ratio is 1:1:2 mixture of cement, fine aggregates and course aggregate in which one part is cement, one part is sand and two part is aggregate. The degree of preparation of the concrete is selected based on the m25 grade concrete mix design.
What is M25 concrete ratio?
1 : 1 : 2
Different types of concrete grades and their uses
| Concrete Grade | Mix Ratio (cement : sand : aggregates) | Compressive Strength |
|---|---|---|
| M25 | 1 : 1 : 2 | 3625 psi |
| M30 | Design Mix | 4350 psi |
| M35 | Design Mix | 5075 psi |
| M40 | Design Mix | 5800 psi |
What is M25 concrete compressive strength?
Compressive strength of M25 concrete (28 days) prepared using 100% RCA increases from 16.9 Mpa to 25.11 Mpa after treatment with Sodium meta silicate, while in the case of M20 strength escalates from 13.14 Mpa to 17.03 Mpa. …
Why do we need to test the concrete compressive strength at 7 14 and 28 days?
The maximum strength of concrete gains at 28th day. Because of the high capital risk in the construction industry, instead of testing the strength in 28th day, the strength can be checked in 7th and 14th day based on the concrete strength psi to predict the construction works target strength.
How is slump value calculated?
What is M30 cement?
∴ In the designation of a concrete mix, the letter ‘M’ and the number stands for Mix and characteristic compressive strength of 150 mm cube at 28 days. ∴ The M 30 grade of concrete means the concrete mix which attains 28 day strength (characteristics) as 30 MPa or 30 N/mm2.