How is admixture percentage calculated?
Table of Contents
- 1 How is admixture percentage calculated?
- 2 How do you find admixture volume?
- 3 How do you calculate water content in concrete mix?
- 4 Is code for concrete admixture?
- 5 What is the effect of admixture on cement content in concrete?
- 6 How to decide the percentage of admixture to be used?
- 7 What factors affect the effectiveness of an admixture?
How is admixture percentage calculated?
Calculation of Sand & Coarse Aggregate Quantities: Admixture = 1.2 \% by weight of cement = 5.064 kg.
How do you find admixture volume?
Admixture = 1.80 / 1.17 X 1000 = 0.0015 Cu. M. = 1 – ( 0.117 + 0.140 + 0.0015 ) = 0.742 Cu. M.
How do you calculate design mix for concrete?
Procedure for Concrete Mix Design of M25 Concrete
- ftarget = fck + 1.65 x S.
- = 25 + 1.65 x 4.0 = 31.6 N/mm2
- Cement Content = (197.4/0.5) = 394.8 kg/m3
- Cement content = (197.4/0.55) = 358.9 kg/m3
How do you calculate water content in concrete mix?
If we need to calculate Water quantity for concrete, first find the cement content for the volume. Therefore, Required amount of water = 0.5 X 50 kg = 25 litres / 50 kg cement bag. For the Design mix, the W/C ratio will depend upon the workability, strength requirements.
Is code for concrete admixture?
Types of Admixtures and Their Standard Codes
| Types of Admixtures | Standard Codes |
|---|---|
| A | IS:9103 and IS:2645 |
| Water-reducing and retarding | ASTM C 494/C 494M – 99 |
| Water-reducing and accelerating | ASTM C 494/C 494M – 99 |
| Water-reducing high range (WRHR) | ASTM C 494/C 494M – 99 |
How is mix design calculated for M30?
Mix proportioning for a concrete of M30 grade is given in A·I to A-ll. s = standard deviation. From Table I of IS 10262:2009, Standard Deviation, s = 5 N/mm2. Therefore, target strength = 30 + 1.65 x 5 = 38.25 N/mm2.
What is the effect of admixture on cement content in concrete?
A 0.5\% concentration of admixture by weight of cement can increase slump from 25mm to 100 mm. (iii) BY the addition of the admixture, concrete with the same workability and compressive strength can be obtained at lower cement content. A 0.5\% concentration of admixture by weight of cement may require 15\% less cement.
How to decide the percentage of admixture to be used?
To decide on \% of admixture to be used, one need to first do a mix design, then to gain the desired properties example – water cement ratio is low and the mix without admixture not even getting mixed correctly. – it requires a high water reducing plasticizer to gain the workability. It purely depend on the properties of admixture.
What is the ratio of cement to water to make cement?
Take 2 kg of cement along with 1 litre of water (w/c ratio=0.5) . Add 0.1\% by weight of cement of admixture to the cement and water mixture. Mix water, cement and admixture for some time.
What factors affect the effectiveness of an admixture?
The effectiveness of an admixture depends upon factors such as type, brand, and amount of cementing materials; water content; aggregate shape, gradation, and proportions; mixing time; slump; and temperature of the concrete. Admixtures being considered for use in concrete should meet applicable specifications as presented in Table 6-1.