Concrete house slabs Melbourne can be found in many forms used for construction projects, with cement serving as its core ingredient and bound together by sand and aggregate.

Precast concrete is produced at a factory and then delivered directly to construction sites for ease of installation and quality assurance. Precasting saves both time and labor while increasing oversight for quality control purposes.

High-Density Concrete

Engineers designing concrete mixes often need something heavier than typical to carry heavy loads or remain intact during burial, while light weight concrete may be ideal for hoisting large panels to create an eye-catching building facade. When designing their mixes, high density concrete is often the go-to material.

This type of concrete has a density range from 2200 kg/m3 to 2500 kg/m3 (137 to 156 lb/ft3). Additionally, reinforced versions often allow it to achieve greater strength.

When crafting high-density concrete, its aggregates must meet certain criteria. They should have similar density to regular concrete aggregates and possess similar particle shapes. Sometimes air-entraining admixtures may also be employed to decrease water content while increasing density. Due to similar physical properties to normal weight concretes, trial mixes should be carried out under jobsite conditions to determine suitability for your project.

Lightweight Concrete

Lightweight Concrete (LWC) is a construction material that reduces the amount of concrete required in structures without diminishing its strength. LWC is produced by replacing part or all of the coarse and fine aggregates with porous lightweight materials – most frequently expanded shale, clay or slate material that has been fired in a kiln in order to form porous structures; air-cooled blast furnace slag; or other sources like coal or coke combustion ash, volcanic pumice or vermiculite can also be used.

For LWC production, the mixture must first be hydrated using water and admixtures similar to those used for regular concrete. The hydration process creates a lower in-place density than regular concrete while still offering strong strength characteristics.

Engineers often rely on LWC for building structural elements in high-rise buildings such as beams and slabs. Furthermore, LWC offers good fire resistance as well as low thermal conductivity making it suitable for energy efficient applications.

Ultra-High-Strength Concrete

Ultra-high strength concrete (UHSC) refers to concrete with a 28-day compressive strength of more than 150 MPa, used to construct taller buildings more efficiently and sustainably.

UHPC allows engineers to reduce the size of structural concrete components by taking advantage of its superior strength, thus saving on materials and labor costs while simultaneously decreasing building weight, which benefits the environment.

One key characteristic of UHPC is its ability to retain strength when exposed to elevated temperatures, but more research needs to be conducted in order to develop cost-effective means of producing it with desired performance characteristics. This involves optimizing mix proportions and using materials like ground granulated blast furnace slag (GGBS), silica fume and fly ash as cement substitutes as well as adding steel or polypropylene fibers that increase its tensile and flexural strengths.

Polymer Concrete

Concrete reinforced with polymer is an innovative construction material. Impregnated with thermosetting (cross-linked) polymers that improve performance of traditional Portland cement concrete, it can be used in high traffic floors, bridge decks and for repair of damaged structures as well as applications that need resistance to various chemicals.

The type of polymer resin chosen has a dramatic impact on the performance of concrete. Acrylic resins cure quickly and provide weather protection; epoxy is popular due to its superior strength and low permeability; while vinyl ester and furan resins have excellent chemical resistance from sulfuric acid to caustic solutions.

Polymer concrete offers numerous advantages over traditional concrete, including lower costs and less water absorption. Furthermore, polymer concrete mixes well with waste materials like fly ash, silica from steel mills, bagasse and rice husks with excellent pozzolanic properties for reduced Portland cement usage in its composition.