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Dust Control in construction site

Dust Control in construction site

Dust: - Dust is defined as fine, dry powder consisting of tiny particles of earth or waste matter lying on the ground or on surfaces or carried in the air. There are two main types:

Dust Control

Silica Dust "- Silica is a natural mineral present in large amounts in things like sand, sandstone and granite. It is also commonly found in mainly construction materials such as concrete and mortar. The silica is broken into very fine dust (also known as Reparable crystalline silica or RCS) during many common tasks such as cutting , drilling. It is often called silica dust.

Non Silica Dust:

There are a number of construction products where silica is
either not found or present in very low amounts. The most common ones include gypsum, cement, limestone, marble and dolomite. This dust is also mixed with silica dust when cutting things like bricks.

The main dust related diseases affecting construction workers are:

·         Lung cancer
·         Silicosis
·         Chronic Obstructive Pulmonary Disorder (Chronic obstructive pulmonary disease (COPD) )
·         Asthma.

Dust Control Strategy in sites:

1.         Measures during transport of construction material.
2.         Measures during storage of construction material.
3.         Measures during construction activities, and
4.          Minimization of impact of air pollution on receptors.
5.          Measures for proper protection.

Dust control during Transport:

1.        Vehicles with an open load carrying area shall not be used for moving potentially dust producing materials. Vehicles will have properly fitting side and tailboards.
2.        Materials having the potential to generate dust shall not be loaded to a level higher than the side and tail boards, and will be carried in vehicles fitted with cover lids.
3.        Workers working in dust generating areas will use nose masks. Placards advising workers to use nose masks will be displayed.
Periodical maintenance and servicing will be carried out to avoid polluted gases coming out of equipments and vehicle.

Dust control during Transport:

Dust Control during storage of construction material:

1.         Excavated materials will be placed in the designated dumping/disposal areas.
2.         The material will be placed in a manner that will minimize dust production.
3.         Material will be stabilized during summer season, each day, by watering at every two hours interval.
4.          The heights from which materials are dropped will be limited to 1.5 m. to limit fugitive dust generation.

Dust control during construction activities at site:

1.         Water will be sprayed at construction sites at regular intervals to suppress dust, during handling of excavated dry soil or debris or during demolition works.
2.        Water sprays will be used during the delivery and handling of all raw sand, and aggregate and other similar materials, when dust is likely to be created and to dampen all stored materials during dry and windy weather.
3.         All motorized vehicles on katcha/GSB roads on the Site shall be allowed a maximum speed of 10 kilometres per hour.
4.          Concrete batching plant and crushing plant sites and ancillary areas will be cleaned frequently and water will be sprayed to minimize any dust emissions.
5.          Electrostatic precipitators/Dust collectors/bag filters will be installed in Batching plant to ensure least emissions.
6.    Barriers/hoarding will be provided securely around all construction work sites (i.e near any sensitive areas) during the main construction activity, when reasonably practicable, to contain dust within the site area and also to reduce air turbulence caused by passing traffic.
7.   The top of the Fine aggregate / sand can be sprinkled with water in a mild way to bring down the dust under control.

Measures for proper protection :

1.        Proper RPE (Respiratory Protective equipment’s) near dust generation source.
2.        RPE shall be compatible with other PPE.
3.        Wearing of RPE properly and in case of tight fitting masks, clean shave need to be done.

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