TANZANIA - #likelafargeholcim

For building tips and information, follow us on

How to minimise concrete wastage on-site

How to minimise concrete wastage on-site

In any construction project, there is likely to be concrete wastage – a small percentage of the concrete that gets dropped on the floor, left on the mixing bed or left unused. These small amounts of concrete wastage still add up to some loss in costs for the contractor, so they need to be minimised as much as possible.

Around three to five percent of concrete is usually wasted on an average building project. However, even this amount can increase the cost of the project. Proper planning and taking extra care when mixing and working with concrete are the best ways to reduce wastage on-site. However, there are several other steps that contractors can take to minimise concrete loss.

Pre-pour checks can minimise concrete wastage

Firstly, pre-pour concrete checks should be conducted to ensure that the site is prepared properly. There should be minimal travel distance between the site where concrete is mixed and where it will be poured. This will reduce the chances of spillage on the way to the pour site. 

Concrete pour cards should be completed as this will inform workers exactly how much concrete needs to be prepared for the job. These cards will ensure that no extra concrete is mixed, which will go to waste when it is not needed for the project. Contractors need to calculate the volume of concrete needed, as accurately as possible, before the pour takes place.

Steps to take during the pour

While the concrete is being poured, contractors should aim to match the speed of mixing with the speed of pouring. In other words, new concrete batches should be mixed just in time for use, when the old batch runs out. This will reduce any waiting time between pours, where the concrete will start to set before it is used.

Towards the end of the concrete pour, the contractors who are mixing the batches need to be informed. This will allow them to stop mixing new concrete in time and to avoid extra concrete supply that will go to waste. Communication is a key factor in minimising concrete wastage during the pour.

In situations where unexpected delays and issues stop the concrete pour, the supervisor needs to have a plan for the concrete being mixed. Using mechanical mixers can help in these situations as they continue to churn the mix and prevent it from setting. Manually mixing concrete can be affected by delays in a pour.

Contractors should always aim to use any leftover concrete elsewhere on the site in order to avoid wastage. This is why planning, communication and timing are such important factors on any construction project. Steps need to be taken before and during a concrete pour to minimise the wastage on-site.

___

LafargeHolcim is a leading building materials and solutions company that has been operating in international markets for decades. We produce cement and aggregates for construction projects, ranging from small affordable housing developments to large-scale infrastructure projects such as high-rise buildings, dams and bridges. 

___

LafargeHolcim Tanzania has been supplying the country and neighbouring countries with our world-class Tembo cement brand for over 30 years. Our head office and fully-integrated plant are located in Mbeya, Southwest Tanzania.

___

At LafargeHolcim Tanzania, we believe customers come first. We listen to your specific requirements to supply and develop the best solutions for your needs. As the new leader in building materials, you can also rely on our cutting-edge research and development capabilities that have resulted in the finest materials for your construction projects, whether large or small.

___

Follow us on Facebook, Twitter, LinkedIn and Pinterest for the best tips on construction, handy projects and the latest industry news. See our Instagram channel for more insights into our products.

Synthetic fibres can increase the durability of concrete

Contractors sometimes add synthetic fibres to their concrete mix. These fibres of man-made polymers are specifically engineered to withstand the long-term alkaline environment within a concrete mix. They are used to minimise cracking, lower the permeability of the concrete and increase the strength of the structure. They act as a secondary reinforcement element; the primary …

The eight types of construction company

There are many different types of construction company. Not all contractors specialise in the same fields and not all companies do the same construction work. Depending on the type of work they do, construction companies can be classified into the following eight types: 1. General contractors A general contractor provides all of the labour, equipment, …

How to fix common concrete slab problems

When working with concrete, contractors may encounter a few different problems. The following issues can sometimes occur when pouring concrete slabs. While some aspects of working with concrete slabs have changed over the years, many issues have not. Here are three common problems that come with pouring concrete slabs, and their possible solutions. 1) Excessive …

How to prevent dampness in a building

Dampness in a building may occur due to faulty construction, the use of poor-quality building materials or bad architectural design. Dampness affects the lifespan of a building or structure, but it also creates unhygienic conditions. Mold and fungi love to grow in damp conditions, so it is best to fix any signs of wet concrete …

The importance of having a schedule for a construction project

Construction projects are delicate operations that need to run on time in order to stay within the allocated budget. As soon as a project is delayed, it costs the contractors and building owners more money. Having a strict schedule is important as it keeps the project on time and allows all workers to know when …

How to prepare a concrete surface for a topping

Sometimes concrete surfaces are given a decorative topping that adds further protection and durability to a floor or carpark. The underlying concrete will need to be prepared properly before any topping is laid on top. This will ensure that a good bond is formed between the two materials and that no cracks or chips will …