Table of Contents
How bulking of sand affect concrete mix?
Bulking of sand cause due to presence of moisture / water in sand. Bulking means increase in volume of sand. Unless you are doing volume batching for concrete, it wont affect the proportions of ingredients much. For batching, you need to do corrections in quantity of sand and water for both volume and weight batching.
What is bulking in concrete?
Definition. Bulking of fine aggregate or sand is the phenomenon of increase in sand volume due to the increase of moisture content.. Bulking test on fine aggregates has to be performed before using it in construction.
What are the factors influence the bulking of sand?
Causes of Bulking Of Sand Bulking occurs due to the formation of a thin film of water around the sand particles. When the sand is moistened, free moisture forms a film around every particle which tends to keep the particles away from one another & thus causes bulking of sand.
How does bulking affect the quantity of the sand in volume batching?
The increase in the volume of sand due to increase in moisture content is known as bulking of sand . A film of water is created around the sand particles which forces the particles to get a side from each other and thus the volume is increased. The increase in moisture in sand increases the volume of sand.
What is bulking of sand in concrete?
Bulking of Sand occurs when sand comes in contact with moisture, which forms a thin layer of water around the sand particle and this thin layer of water exert an outward force on each other which cause the sand particle to move away from each other and ultimately increase the volume of sand.
What is bulking of coarse aggregates?
What is bulking of coarse aggregates? Explanation: Bulking is indirectly proportional to the particle size of the aggregates. Size of coarse aggregates is more hence negligible bulking. Explanation: With the moisture content of 5 to 10\% by weight, the bulking of sand is increased by 50.
What is bulking in sand?
What happens if bulking is not accounted for while preparing concrete *?
What happens if bulking is not accounted for while preparing concrete? Explanation: If care is not taken while volume batching, concrete is likely to be undersanded and gets hard eventually. 5.
What is bulk density of sand?
The approximate bulk density of sand that is commonly used in normal-weight concrete is between 1520-1680 kg/m3 (95-105 lb/ft3)
What is bulking in building construction?
It is the increase in volume of a given quantity of sand, a phenomenon that is not present in gravels. The ratio of the volumes before and after the excavation is called the bulking factor. …
What is the effect of bulking of sand while batching?
There will be no effect of the bulking of sand if weight batching is adopted while batching the aggregates. But when batching by volume is adopted, the sand will be taken less than the requirement in the mix, and this result in disproportionate and non-uniform mix. So, to overcome this the volume of sand is increased by percentage bulking.
What is volume batching of concrete?
What Is Volume Batching of Concrete? Batching of concrete means measuring different ingredients of concrete (i.e. cement, sand, coarse aggregate and water) before mixing it. When this measurement is done on the basis of volume, we call it Volume Batching.
How do you increase the volume of sand in concrete?
So, to overcome this the volume of sand is increased by percentage bulking. The yield strength of the concrete is affected by the bulking of concrete. The water in the sand is useful for maintaining the water-cement ratio that helps in improving the workability. An excessive amount of moisture can reduce the strength of concrete.
What is the maximum bulking of sand in a graph?
Fig: bulking of sand graph. From the graph, we can know that the maximum bulking takes place from 5 – 10\% of moisture content and when moisture content increases from 20\% volume of moist sand tend to be equal with the volume of dry sand. Step 1: Take 300g of oven dried sand sample.