Lightweight Concrete Method (LCM) was developed in Europe over 60 years ago and has since then been on the international market for more than 20 years. LCM has been used in the building industry for well over one hundred thousand apartments and houses in over 40 different countries. There fore In this paper we are looking at exploring use of foamed concrete with little modifications as it is beneficial in construction because of its easy application, sound insulation and other benefits over traditional concrete.
After the Second World War, this technology quickly spread to different parts of the world, mostly Europe and the Soviet Union. The applications were for economical ...view middle of the document...
Having low compression strengths, it limited this product to fills and insulation only.
The major use in recent years in the United States has been over plywood on wood floor systems or over hollow-core precast slabs. The material is also used in light density for roof fills 481 kilograms per cubic meter [30 pounds per cubic foot] providing good insulating properties.
Even today these materials still generate low compressive strengths limiting it to these two applications. Range options are 3.45 MPa [500 psi] to 6.89 MPa [1,000 psi] for midrange nonstructural densities and 10.3 MPa [1,500 psi] to 24.1 MPa [3,500 psi] for higher densities 1762 kg/m³ [110 lb/ft³].
2. INTRODUCTION OF AERATED FOAM CONCRETE
WHAT IS FOAM CONCRETE?
Aerated Concrete is created by inclusion of a multitude of micro air bubbles in a cement based mixture. This is achieved by mixing the concentrated Foaming Chemical with water and generating foam there from, generally by using compressed air. To achieve the optimum results, an Aerator is required. The foam is then mixed with the sand / cement / water slurry using conventional ready mix or permanent concrete mixing facilities. Aerated Concrete behaves like ordinary dense weight concrete in most aspects, such as curing.
PROCESS OF PRODUCING AERATED FOAM CONCRETE:
The Aerated Lightweight Concrete process is based on the principle of entrapping a multitude of air bubbles in the concrete mix, which retain their structure during the curing period. Firstly, the mix composition of cement / sand / water / foam according to specification has to be chosen. After batching the basic ingredients Foaming Agent is introduced to the mix which then can be poured into panel molds of virtually any shape or size. The Aerated Lightweight Concrete Mix normally cures in open air within about 24 hours (unless it is used in cold weather conditions) before handling is recommended. It is possible to add other products to Foam Mix to obtain lightweight composite concrete. Notably the use of various fibers increases the strength of the product and prevents cracking in adverse conditions.
3. FOAM GENERATOR AND FOAMING AGENTS
Foam generator, which runs from an air compressor, consists of components such as the MSD unit, foaming unit, and a lance unit. Unlike pressure tank systems, foam generator runs on a principle of providing continuous and constant foam with minimum refill. They are also more accurate and easier to run compared to fully air operated systems. These components allow great flexibility to the user in terms of the scale of production of foam concrete since it can accommodate to future production requirements. Foam generator units are lightweight, transportable and may be used on-site or adapted to existing concrete production plants. Its size, output, and mobility are also well suited for small to medium scale production and laboratory work on foam concrete. Several control devices on foam...