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Sugar is act as an accelerator or retarder in concrete?
RiyaJames
Sugar is retarding agent. Retarders are type of admixture that extend the hydration induction period, thereby increasing the setting times. Sugar is a carbohydrate, a substance composed of carbon, oxygen and hydrogen. It can be useful when concrete used in hot weather. Sugar is used as a retarder foRead more
Sugar is retarding agent.
Retarders are type of admixture that extend the hydration induction period, thereby increasing the setting times. Sugar is a carbohydrate, a substance composed of carbon, oxygen and hydrogen. It can be useful when concrete used in hot weather.
- Sugar is used as a retarder for a concrete mix.
- The setting time of concrete increases with increase in the percentage of sugar up to 0.06% by weight of cement. Beyond 0.06% use of sugar it is found that the both initial and final setting times drastically reduces. Sugar when used in correct proportion acts as retarder.
- Sugar upto 0.06% helps to delay the setting of cement at construction site during hot weather concreting.
- It is cheap and readily available. If used carefully, it could be economical in comparison with other retarders.
- Furthermore, most of the studies conducted on the use of sugar as a set retarder focused on the setting time of such concretes, without much emphasis on the effect of adding sugar on strength. Still some studies observed that, the concrete mixture with 0.06% of sugar had more 28-day compressive strength, by about 14.64 MPa, as compared to the concrete without sugar.
See lessHow many cement bags and sand is required for M20 grade of concrete?
RiyaJames
For an M20 grade of concrete, the ratio is (1:1.5:3) ie, (1 part of cement: 1.5 part of sand: 3 part of Aggregate) Let us assume for 1 Cum. Of M20 concrete, So, Wet volume of concrete = 1 Cum Dry volume of concrete = 1.54 times of the wet volume of concrete (Here 1.54 stands as “Factor of safety” toRead more
For an M20 grade of concrete, the ratio is (1:1.5:3) ie, (1 part of cement: 1.5 part of sand: 3 part of Aggregate)
Let us assume for 1 Cum. Of M20 concrete,
So, Wet volume of concrete = 1 Cum
Dry volume of concrete = 1.54 times of the wet volume of concrete (Here 1.54 stands
as “Factor of safety” to counter the shrinkage)
= 1.54 Cum
Total of ratio = 1 + 1.5 + 3 =5.5
Therefore, Volume of Cement = (1/5.5) x 1.54 = 0.28 m3
No. of Cement Bags = 0.28 x (1440 Kg/cum / 50 Kg/Cement Bag)
= 0.28 x 28.8 = 8.064 Bags
Say, 8 Bags of Cement
Volume of Sand = (1.5/5.5) x 1.54 = 0.42 m3
Say, 0.42 Cum of Sand
Volume of Aggregate = (3/5.5) x 1.54 = 0.86 m3
Say, 0.86 Cum of Aggregate
NOTE: Density of Cement = 1440 Kg/Cum for one bag of 50 Kg cement
See lessWhat is the significance of Fineness of Cement?
RiyaJames
The Fineness test of cement is done by sieving a cement sample through a standard IS sieve. The weight cement particle whose size greater than 90 microns is determined and the percentage of retained cement particle are calculated. This is known as the Fineness of cement. Significance of Fineness ofRead more
The Fineness test of cement is done by sieving a cement sample through a standard IS sieve. The weight cement particle whose size greater than 90 microns is determined and the percentage of retained cement particle are calculated. This is known as the Fineness of cement.
Significance of Fineness of Cement
PROCEDURE OF FINENESS TEST OF CEMENT:
Fineness = (W2/W1) * 100
Fineness Test of Cement & Result:
Sample (W1)
Retained on 90µm Sieve (W2)
Result: The standard cement should have fineness less than 10 % as per IS Recommendations.
See lessWhat are various functions of retarders in Concrete? What is meant by accelerator?
RiyaJames
Admixtures are organic or inorganic materials added in limited quantities to improve or achieve the properties of the mortar. Accelerators and Retarders are two types of admixtures. Accelerators Mainly accelerators are used to reduce the setting time, thus gear up initial setting time. Early strengtRead more
Admixtures are organic or inorganic materials added in limited quantities to improve or achieve the properties of the mortar.
Accelerators and Retarders are two types of admixtures.
Accelerators
Retarders
Gypsum is the retarding agent in cement to prevent it from premature hardening. The addition of gypsum in cement not only influences its setting time but other properties as well. Gypsum is fire resistant. It influences the strength, strength development, and volume stability of cement.
See lessWhat are the advantages of Porotherm bricks?
RiyaJames
Porotherm bricks provides a comfortable living environment due to its thermal efficiency and acoustics efficiency. These bricks are light weight which helps in maintaining a steady production during construction. They are made up of entirely natural ingredients such as rice husk ash, sawdust, coal,Read more
Porotherm bricks provides a comfortable living environment due to its thermal efficiency and acoustics efficiency.
These bricks are light weight which helps in maintaining a steady production during construction.
They are made up of entirely natural ingredients such as rice husk ash, sawdust, coal, ash etc. Porotherm bricks are approved as eco-friendly by GRIHA (Green Rating for Integrated Habitat Assessment) and IGBC (Indian Green Building Council).
It is highly fire rated as it is burnt at 1000 degree Celsius. So during fire it provide sufficient time for evacuation.
Porotherm bricks are low water consuming when compared with conventional bricks.
Moreover, they are recyclable and reusable and do not harm the environment.
See less