standard sand lime bricks specification that make them profitable for masonry can be studied through this site.Sand lime brick is a kind of brick that makes use of water, silica and quicklime (coa) in its composition. The medical call of lime brick is calcium silicate brick, and it's far the identical medical call as silica and lime. Even in a few markets this brick is referred to as calcium silicate brick. Lime bricks are fired in unique gadgets known as autoclaves and are steamed beneathneath strain at a temperature of 1200 levels Celsius. This cooking technique offers the brick correct resistance to strain and its grains adhere well. These bricks are extensively utilized in each load-bearing partitions and wall cladding because of their very excessive resistance. [caption id="attachment_158855" align="aligncenter" width="1200"]
how to make sand lime bricks
[/caption] Limestone sand brick, additionally referred to as calcium silicate brick, is received from the aggregate of calcareous water and silica. For this, quicklime (Cao) is blended with silica sand and water in a ratio of 1:eight to 1:12 and pressed right into a mould at four hundred kg/cm2 stress and fired at 1200 degrees. 5-9% quicklime or eight-12% quicklime may be utilized in sand-lime brick and approximately 88% silica sand is likewise used withinside the composition. The quantity of magnesium used ought to be much less than 5%. The sand used have to be siliceous and feature the subsequent residences in phrases of grain length and diameter. Since granulation has an immediate impact on strength, porosity and powerful thermal stresses: 1.the grains ought to have a most diameter of 6 mm. 2.The diameter of multiple 0.33 of the seeds must now no longer be much less than 0.1 mm, as this could boom the lime consumption. 3.The grain length distribution of sand grains can be discontinuous. So there's no unique length. 4.For coarse-grained bricks, no multiple-0.33 of the overall grain quantity have to be no a couple of millimeter. 5.For fine-textured bricks, no extra than ten percentage of the entire extent of sand must be large than one millimeter. In the manufacture of sand-lime bricks, a combination of sand, lime and water is poured right into a mould and located beneathneath excessive strain from mechanical and hydraulic presses, then located in an autoclave beneathneath excessive steam stress and ignited. 
sand lime bricks vs clay bricks
Calcium silicate bricks also are referred to as sand-lime bricks. Lime and silica are used in place of clay withinside the manufacture of this kind of brick. Clay bricks, because the call suggests, are crafted from clay. Therefore, their first-class in large part relies upon at the nice of the unique clay. Chemically, it could consist of minerals consisting of clay, feldspar, illite and kaolin, and a few different minerals which includes calcite-quartz, mica and alumina. The primary constructing blocks of those minerals commonly consist of silicon, aluminum, oxygen, alkali metals and fundamental metals which includes iron and manganese. The percent of clay-forming factors and substances relies upon at the kind of supply rock and the period of the hauled path, climatic situations, and the topography of every region. The firing temperature of clay bricks is appropriate for brick manufacturing amongst low refractory soils fired at a temperature under 1250 tiers Celsius. The temperature required for firing bricks relies upon at the kind of soil and the variety of mineral factors withinside the soil. Suitable temperature is among 900 and 1200 levels. Substances inclusive of iron oxide, lime, sodium and potassium salts decrease the melting factor of the soil. If the clay consists of a excessive silica and aluminum content material, it's far taken into consideration a refractory soil and is fired at a temperature above 1250 levels. 
The impact of soil colour at the colour of clay bricks, modifications in soil colour relying on kiln situations and firing temperature, and the compounds found in it after firing. Clay with 10% manganese oxide turns yellow, darkish brown, red and black after firing and acts as a robust fuse. Minerals including hematite and limonite (iron compounds) impart a crimson or mild brown and yellow colour to the soil. The use of such soils in masonry produces purple, brown, burnt brown and black bricks, relying at the firing temperature. Most clay soils comprise remnants of animal and plant organisms that provide the soil a grey or nearly black colour. In brick manufacturing, the combustion of this natural cloth at some stage in cooking can every so often be powerful in gasoline saving, however the best of the bodily and mechanical homes of the brick will likely lower because of the void created through the combustion of natural substances. The impact of the quantity of every detail withinside the clay at the excellent and colour of silicon oxide clay bricks According to the standard, the proper quantity of silicon oxide is among forty and 60 percentage of the floor. On the opposite hand, because the temperature will increase for the duration of the firing of the bricks, the extent of silica grains will increase constantly and isn't always well matched with the uniform shrinkage of the clay at some stage in firing and capillary cracks shape across the brick. silica grains. Increasing the quantity of silica makes the brick thicker and heavier and will increase the firing temperature. Aluminum oxide or aluminum is an appropriate variety of 9-21% aluminum oxide. Aluminum oxide is one of the refractory compounds, and its growth in floor will increase the melting factor of the brick, and the brick is fired at a better temperature. Also, its excessive content material in soil reasons uncooked clay to crack while dry and brick to interrupt while fired. Iron oxide Iron oxide has the function of a pyrogen (reduces the brick firing temperature) at temperatures above one thousand levels Celsius. Clay containing 5-8% iron oxide produces purple brick below ordinary firing situations. Iron oxide clay relies upon on the share of iron oxide, percent of alkaline compounds and post-firing temperature and kiln situations (oxidation or reduction), generating bricks of various colors. At a temperature under a thousand°C and the brick is pink withinside the case of oxide, at a temperature of 1100°C and withinside the case of kiln-oxidizing brick manufacturing it's far crimson in colour, tending to brown. If the furnace is in recuperation mode, the brick colour might be grey or black. If the clay consists of 3-4% alkaline compounds along with sodium and potassium, or if it's miles fired at excessive temperatures, the colour of the brick can be brighter and crimson.