How SFRC Manhole Covers Are Made: A Step-by-Step Process

Learn the process of how SFRC manhole covers are made to withstand the toughest conditions. Get an idea of choosing the best covers for your project!

22 Mar, 2023
How SFRC Manhole Covers Are Made: A Step-by-Step Process - blog poster

Manhole covers are an essential component of urban infrastructure. They provide a safe and secure way to access underground utility systems such as sewer lines, gas pipes, and electrical cables. These durable covers also serve as a safety measure. It prevents pedestrians and vehicles from falling into the open manhole. 

However, not all manhole covers are created equal. SFRC manhole covers are known for their exceptional durability and resistance to wear and tear. With advances in technology, manhole cover manufacturers are making even more durable covers for various applications.

But have you ever wondered how these heavy-duty covers are made? Let’s take you on an informative ride that will define to you the step-by-step process of how sfrc manhole covers are made. So, whether you're a construction professional, or curious about the making process, read on to discover the manufacturing process of SFRC manhole covers.

What Is SFRC?

Imagine walking down a busy city street while your eyes scan the pavement for any obstacles. Suddenly, your foot hits a solid surface. Hey, you've just encountered an SFRC manhole cover. But what makes SFRC so solid and durable, and how is it different from other construction materials? SFRC manhole cover stands for steel fiber reinforced concrete. This type of manhole cover is designed to be more durable and resistant to wear and tear than traditional concrete covers. SFRC manhole cover has a longer lifespan which makes it ideal for use in areas with heavy traffic or high levels of wear and tear. Moreover, SFRC manhole covers are also much lighter than traditional concrete covers. This is why they are easier to install and remove.

SFRC is a composite material made up of cement, water, fine aggregates, and steel fibers. The process of making SFRC manhole covers involves several steps. Each step is crucial to ensuring the quality and durability of the final product. Let's dive into the details of each step.

Step 1: Design Phase

The design phase is the initial step in the manufacturing of SFRC manhole covers. This activity involves careful consideration of the intended use of the cover and the environment in which it will be installed. To give it a perfect shape a 3D model is created using computer-aided design (CAD) software. The design team considers important factors such as the load capacity of the cover, the type of traffic that will be passing over it, and the depth at which it will be installed. They also take into account any safety features, such as anti-slip coatings or locking mechanisms. All these things are required to prevent accidents and ensure user safety.

Step 2: Material Selection

The next step in the manufacturing process of the SFRC manhole cover is the selection of materials. The selection of the right raw materials can greatly impact the strength, durability, and overall quality of the final product. The primary materials used in the production of SFRC manhole covers are steel fibers, cement, sand, water, and other additives. Steel fibers are added to the concrete mix to provide reinforcement and increase its strength and durability. Cement is used as the binding agent in the mix, while sand provides bulk and helps to prevent cracking. The selection of these materials depends on the load capacity, the depth of the manhole, and the environment in which it will be installed. 

Recycled materials can also be used in the mix, making SFRC covers an environmentally friendly option for everyone.

Step 3: Mixing

The third step is mixing the raw materials in the correct proportion to get the desired consistency and strength. The mixing process can be done manually or with the help of specialized equipment such as a concrete mixer. One should closely monitor the mixing time, speed, and intensity to ensure that the ingredients are thoroughly blended and that there are no lumps in the mix. Once the mixing is complete, the SFRC mix is ready for molding into the desired shape of the manhole cover.

Step 4: Molding the Manhole Cover

Once the materials have been selected, the SFRC mix is poured into a mold. The mold is made from two parts: a base and a top, which fit together to form a hollow cavity in the shape of the manhole cover. The SFRC mix is poured into the cavity, and a layer of reinforcement mesh is added to provide additional strength.

Step 5: Curing the Manhole Cover

After the SFRC mix has been poured into the mold, it is left to cure for several hours. The exact time required will depend on the specific mix of materials used. But it typically takes between 12 and 24 hours for the SFRC to harden sufficiently. The curing process is critical to ensure the cover's strength and durability.

Step 6: Demolding the Manhole Cover

Once the SFRC has cured, the mold is opened, and the cover is carefully removed. The cover is still in its raw state at this point and requires further processing before it is ready for use.

Step 7: Surface Treatment

The SFRC cover is then subjected to a surface treatment, which can include sandblasting, grinding, or polishing. This process smooths out any rough edges and provides a uniform finish. It also prepares the surface for the application of a coating or paint.

Step 8: Testing the Manhole Cover

Before the cover is shipped to the customer, it undergoes a thorough inspection to ensure that it meets the required quality standards. The cover is checked for any defects, such as cracks or chips, and its load capacity is tested to ensure that it can support the intended use. Any issues that are identified during the inspection phase are addressed before the cover is released for shipment.

Step 9: Packaging and Delivery

Once the cover has passed inspection, it is carefully packaged to prevent damage during transport. SFRC manhole covers are significantly lighter than their cast iron counterparts. Their light weight makes them easier and more cost-effective to transport. They are also less susceptible to damage during transit, which helps to ensure that they arrive at their destination in good condition.

Wrap Up:

SFRC manhole covers manufacturing process involves careful planning and material selection. Each step in this process is crucial in ensuring that the final product meets the necessary standards. Adding steel fibers to the concrete mix provides strength and durability to the manhole cover. The quality and durability of the final product depend on how well these steps are executed. These covers are becoming increasingly popular due to their durability and ability to withstand heavy loads.

We, at om concrete products, pride ourselves on our expertise in the field of SFRC manhole covers. We ensure that each step of the process is carried out to the highest standards, resulting in high-quality, durable manhole covers that meet the required specifications.

If you need SFRC manhole covers for your construction project, contact us today, and we will be happy to provide you with our expert services.


Are SFRC manhole covers more expensive than cast iron covers?

SFRC covers may have a higher upfront cost, but their lower maintenance costs and longer lifespan can make them a more cost-effective option in the long run.

How long does it take to make an SFRC manhole cover?

The entire process, from design to delivery, can take several days to several weeks. The time frame depends on the specific requirements of the cover.

Are SFRC manhole covers as strong as cast iron covers?

Yes, SFRC covers are as strong or even stronger than cast iron covers, thanks to the addition of steel fibers to the concrete mix.

Can SFRC manhole covers be customized?

Yes, SFRC covers can be customized to fit the specific needs of the customer, including size, shape, and load capacity.

Are SFRC manhole covers recyclable?

Yes, SFRC covers can be recycled at the end of their lifespan, making them a more environmentally friendly option than cast iron covers.

What are the advantages of SFRC manhole covers?

SFRC manhole covers are more durable and longer-lasting than traditional manhole covers. They are also more cost-effective in the long run as they require less maintenance and have a longer lifespan.

How are SFRC manhole covers different from traditional manhole covers?

SFRC manhole covers are made from a composite material. It includes steel fibers, which makes them stronger and more durable than traditional manhole covers.