What you need to know about lightweight concrete

What you need to know about lightweight concrete

Lightweight concrete is a type of concrete that is typically precast rather than cast in situ. This type of concrete is made with air-entraining admixtures, which create micropores that are connected, making it much lighter than conventional concrete. These pore-forming admixtures can be added to the concrete using a chemical or high-pressure method, significantly reducing the final product’s weight.

Low-density concrete

Low-density concrete has many uses, from backfilling mine workings to bridge abutments. It is also used as a subgrade for permeable pavement surfaces and as a roofing system. Low-density concrete is available in various forms, including bulk drums, IBC totes, and pails.

The main advantage of LDC is its large mass savings. It can achieve the same strength as normal-density concrete despite using 60-70% less aggregate. It reduces the dead load on supporting members and spans. It allows for more flexibility in construction. Additionally, LDC concrete can be transported more easily, and truck concrete mixers can handle higher volumes.

It is used for insulation

Lightweight concrete is an effective insulator and is often used for various applications. In addition to its thermal properties, lightweight concrete is also good at absorbing sound. It is used for floors and intermediate walls and is an excellent way to reduce static loads in buildings. It also reduces the amount of iron and concrete used in a structure, which reduces labour costs. Lightweight concrete is made from cement, sand, and special foam. The concrete does not need to go through vibrators, so it is easy to use in construction projects.

Lightweight concrete is a versatile material that is being used more often to improve the performance of structures. The material comprises a cement-based mortar mixed with up to 20% air. It was first patented in 1923 and is now used in various applications. Although the process was used in the Roman era, it has only recently been used on a large scale. This new method of producing lightweight concrete is made possible by improved production equipment and surfactants.

It is made from sintered fly ash

Lightweight concrete is a form of structural concrete that uses sintered fly ash as an aggregate instead of cement. Fly ash is highly porous and contains a void, which helps to reduce its density. It is a natural alternative to cement for lightweight concrete.

The benefits of fly ash as an aggregate are numerous. Not only does fly ash provide lightweight aggregate, but it also provides a useful outlet for mounting waste. Concrete requires aggregate to add volume and stiffness to the mixture. Traditionally, crushed aggregates are used in concrete, which depletes natural resources. In this respect, fly ash is a promising alternative building material. Fly ash can be used in concrete as an aggregate and supplementary cementitious materials. 

The properties of lightweight aggregates depend on the processing conditions. The amount of fly ash in a lightweight aggregate affects its porosity. An 80:20 mix of fly ash and clay has a specific gravity of 1.66 g/cm-3 and a compressive strength of 25 MPa. It also has water absorption of 0.55%.

It is aerated

Lightweight concrete is a type of concrete that uses aerated cement rather than normal cement. This type of concrete is typically used for insulating purposes but can also be used for structural applications. Lightweight concrete is a mix of Portland cement and lime that has been aerated. Some of the most common industrial lightweight aggregates used in lightweight concrete are Leca (expanded clay), Aglite, and Hydite.

One of the biggest advantages of lightweight concrete is it is thermally insulating. The aerated content also helps to reduce the amount of waste generated from its manufacturing. This type of concrete also requires less energy than regular concrete. 

Another advantage of lightweight concrete is its ability to withstand heat and cold. Unlike normal concrete, it also has a low coefficient of thermal expansion. In addition, it is also very fire resistant. Another benefit is that aerated concrete is non-toxic, making it an excellent choice for large construction projects.


It is poured from a mixer

When mixing concrete, the ingredients are put onto a flat surface, and workers add water. They can mix the cement by hand or use special tools, depending on the amount and quality needed. Different types of concrete can have different properties. Mixing the materials properly is essential for the final product to be consistent, durable, and able to hold its shape.

Various additives are used to improve the physical properties of wet concrete. These additives can delay the curing process or can accelerate it. The type of reinforcement used will also change the final material. Most concrete is generally poured with reinforcing materials embedded to provide tensile strength. Such concrete is known as reinforced concrete. You may check this website to learn more about this.

Most concrete contains three main ingredients: cement, coarse aggregate, and light aggregate. These materials bind together with water and give concrete strength and durability. Lightweight concrete is a version of traditional concrete that uses lighter aggregates. Adding lightweight aggregates can significantly reduce the overall weight of the concrete.