Fly Ash Blocks (Aerated Autoclaved) stacking or storage should be protected from direct rain. Stacking should preferably on Pallet to protect the bottom of blocks from dampness. Ground should be clean and levelled. Blocks should be kept on its height side as we construct the wall. Height of stacking may be taken as 1200-1500 mm. Blocks should be kept slightly on the stack to avoid any possible damage during stacking. Blocks must not be lifted or placed rubbing above one another. Blocks must be stacked in a systematic arrangement so that counting of same may be easier.
Deflection of the beam, soil settlement to one side, uneven placing of blocks during construction are some reasons of wall cracking. Structural Movements due to Thermal Expansion or change in moisture content or moisture movement. To overcome this, Fly Ash Blocks (Aerated Autoclaved) usage must be delayed till equilibrium moisture content. For this purpose, Fly Ash Blocks (Aerated Autoclaved) must be stored 10-15 days prior to application. Deflection of the beam, soil settlement to one side, uneven placing of blocks during construction are other reasons. Cracks appear in all type of concrete including clay bricks. By using some construction techniques and proper workmanship, we can minimize these cracks. Levelling of blocks should be accurate and must be checked using Spirit Level preferably of 2 meters length. The first course of blocks should be given sufficient time to set and at least 24 hours must be given. Framed Structure should be given enough time to cure and settle so that any change in structure due to structure movement can be noticed. Control Joint of 10 mm must be given after every 3 meters from bottom to the top of the wall. Control Joint must be filled with some resilient material or backer-rod which are more easily compressed and seal with caulking. Expansion Joint ties must be given after every third course and placed between gaps of control joint. Bond beam must be given after every 1200 mm in height using reinforcement of two MS rods of 8 mm tied with 6-8 mm steel with a gap of 6”-9”. Minimum thickness of bond beam must be taken 3” with concrete cover of 15-20 mm on sides. Bond beam must be discontinuous at control joint. Steel rods must be embedded in column 5-6 times of its diameter and fixed using non-shrinkable high strength grout. Mortar mix for filling the bond beam can be taken as Cement: Sand in the ratio 1:4. Purpose of bond beam is to give stability and strength to the wall. After every 3rd course, wall ties must be used between block and concrete column.
You can use Fly Ash Blocks (Aerated Autoclaved) to construct all type of wall between two columns in framed structure like partition wall, curtain wall, balcony wall and boundary wall.
Water Absorption Test @ 24-hour water immersion is not given in Standard of Fly Ash Blocks (Aerated Autoclaved) IS-2185 Part-3. It is recommended to test thermal insulating wall elements like AAC for Capillary water absorption. AAC is superior for capillary water absorption in comparison to conventional brick. Like Red Clay brick, AAC is not recommended to use in foundations and damp environment, so water absorption test is not applicable for AAC.
Due to different reasons, blocks may get damaged during transport or handling at the site. This can be used as half cut blocks after size cutting. Indian Standard IS-2185 Part-3 Clause 8.1.1 allows slight cracks and small chipping, not larger than 25 mm, shall not be deemed grounds for rejection.
Yes, when we apply mortar on blocks, AAC absorbs certain amount of water from mortar mix and mix may get crack so prior wetting of blocks is essential. For this purpose, we dip the block in water drum completely for few seconds and take out. If water drum is not available, we can wet the blocks by other convenient methods but purpose is to wet the surface of blocks. Never do too much wetting of blocks.
We maintain the dimension variation in height and thickness of ± 1 mm and for length ± 5 mm.
Raw Materials are Fly Ash, OPC Cement, Water, Quick Lime, Gypsum, Aerating Agents and Additives. All raw materials are mixed in mixer and a thin slurry is prepared. Then slurry is poured in Metal Moulds and mass rises and becomes lightweight due to aeration. Then the cake is cut into desired sizes. For strength, Steam curing is done.
Fly Ash Blocks (Aerated Autoclaved) are in different sizes. In Length 650, 600 mm. In Height 250, 240, 200 mm and in thickness 75, 100, 125, 150, 200, 225 mm.
No, Fly Ash Blocks (Aerated Autoclaved) are not recommended to be used in foundation and areas where there is high dampness.
Strength of AAC is similar to the conventional clay brick. Main advantage is its strength/ density ratio is better than the conventional brick.
Its water absorption is higher than the Red Clay brick if immersed in water for 24 hours. So in certain applications like foundation, main hole and concrete water tanks, it’s not recommended to use.
Normal nails once fixed may come out. Use fasteners or screwed nails. Anchors made of plastic and nylon will work. Use power drill for anchoring.
For Electrical Conduting (Jhari), preferably use electric chaser (jhari making machine). It gives fine and accurate chasing and has no impact on AAC walls. Manual chasing using normal chisel must be avoided.
Use any non-shrinkage mortar. First apply thin cement slurry on chase and fix fiber mesh and then apply non-shrinkable mortar.
No, in AAC water does not pass through due to discontinuous air pores. While in red clay brick, due to high capillary suction, water penetrates through it.
Yes, AAC has thermal insulating properties. Its thermal conductivity is 1/5th of a red clay brick. So AAC conserves the heat for a longer period and saves energy cost due to air conditioning or room heater.
Minimum Compressive Strength of Ascolite Fly Ash Blocks (Aerated Autoclaved) is 3.5 N/mm2 and most of the time it is observed above 4.0 N/mm2 while the requirement is minimum 1.5 N/mm2 as per Indian Standard IS02185 (3) density 451-550 Grade 2. Ascolite Fly Ash Blocks (Aerated Autoclaved) confirms IS-2185 Part-3 oven dry density range 551-650 Grade 2.
Yes. IS-2185 Part-3 is the Indian Standard Specification for Fly Ash Blocks (Aerated Autoclaved).
Yes, all standard sizes of Ascolite Blocks are ISI marked. ISI marking is there on each block.
Yes, Every Ascolite Fly Ash Blocks (Aerated Autoclaved) has a batch number.
Yes, IS-6041 (Code of Practice for Construction of Autoclaved Cellular Concrete Block Masonry). IS-6041: Code of Practice for Structural use of Unreinforced Masonry.
You are suggested to give control joint after every 3 metres interval and the joint has to be filled with resilient material or backer rod and seal with caulking.
Fly Ash Blocks (Aerated Autoclaved) are light in weight, larger in size, saves labour cost. Also, construction time is less. Also, Fly Ash Blocks (Aerated Autoclaved) are accurate in sizes in mm, so accuracy in wall construction is there.
Yes, light weight building materials like AAC are always recommended for earth quake prone areas.
Yes, we provide.
No, AAC does not catch fire and its fire Rating is 4 Hours for 8 inch wall.
Yes, Fly Ash Blocks (Aerated Autoclaved) can be used for non-load bearing and load bearing purpose.
Minimum 150 mm is recommended.
Fly Ash Blocks (Aerated Autoclaved) wall can be constructed of minimum 100 mm for internal wall purpose.
Fly Ash Blocks (Aerated Autoclaved) wall can be easily chased using a special machine. Normal Chasing can be done using chisel but not recommended. For Nailing, Fasteners must be used. It can be easily cut using a normal hand saw.
You need a Low Capacity Compression Testing Machine of 250 KN and a Cutting Machine. High Capacity Machines of 2000-3000 KN are not recommended to use. Follow the testing guidelines as mentioned in IS-6441 Part-5.
There is a difference between immediate density and oven dry density. In normal condition, Fly Ash Blocks (Aerated Autoclaved) have certain moisture content so their density is observed higher but for testing purpose, we dry the sample at 105 °C for 4-5 days till constant weight is achieved and then we obtain moisture free density or dry density. Refer IS-6441 Part-1 for testing the oven dry density.
Yes, we have state of the art testing lab for finished products and raw materials with all necessary equipments with valid calibration.
Due to excessive change in moisture content, all concrete including AAC exhibit change in volume. For this purpose, it is recommended to delay use of AAC for construction for 10-15 days so that Fly Ash Blocks (Aerated Autoclaved) can achieve equilibrium moisture content.
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