Artificial Low Density (LDA) light weight Aggregates

LDA -Sintered Flyash lightweight aggregates 

Lightweight Aggregates (akin low density aggregate) is a generic name of a group of aggregates for structural concrete, mortar, or plaster that weighs less than usual rock aggregates including natural sand, gravel, and crushed stones. At an earlier stage, lightweight aggregates were mainly from natural origin, mostly volcanic pumice, etc.

It is production  begins with mining or quarrying the raw material and with the development of mining machinery and technology, they can be manufactured from the natural raw materials like expanded clay, shale, slate(expanded about twice the original volume of the raw material) as well as from the by-products such as fly ash, blast furnace slag, etc. However, the natural pumice, vermiculite, and perlite can also be used as substitutes. The expanded raw material(excluding pumice) has properties similar to natural aggregate, but is less dense and therefore yields a lighter concrete product.

Structural lightweight aggregate refers to the structural aggregates have the bulk density less than 1120 kg/m³for fine aggregate and less than 880 kg/m³ for coarse aggregate. This includes aggregates prepared by expanding, pelletizing, or sintering products such as blast-furnace slag, clay, fly ash, shale, or slate, and aggregates prepared by processing natural materials such as pumice, scoria etc.

Masonry-lightweight aggregate refers to the aggregates have the bulk density less than 1120 kg/m³ for fine aggregate and less than 880 kg/m³ for coarse aggregate. This includes aggregates prepared by expanding, pelletizing, or sintering products such as blast-furnace slag, clay, diatomite, fly ash, shale, or slate; aggregates prepared by processing natural materials such as pumice, scoria,  and aggregates derived from and products of coal or coke combustion.

nodullar-lightweight aggregates for waterproofing 

Insulating aggregate refers to the nonstructural aggregates including Perlite with a bulk density between 120 and 192 kg/m3, and Vermiculite with a bulk density @350 kg/m3), nodullar @650kg/m3 as well as aggregate prepared by expanding, pelletizing, or sintering products such as leca , Sintagg or lexa such as blast-furnace slag, clay, diatomite, fly ash, shale, or slate; aggregates prepared by processing natural materials such as pumice, scoria,  and aggregates derived from and products of coal or coke combustion.

It is used to produce lightweight concrete products such as insulating screed concrete concrete, blocks, structural concrete, and lightweight concrete pavement etc.