Using Jointing Mortar Bag
Use approx. 40 kg of AR BLOCKSET/V-LITE BLOCKSET Block Joining Adhesivethin bed mortar with Approx. 9 to 12 litres of potable water. It is utmost important to add Dry Mix Product to the water and not vice versa.Mix the material by hand or using a slow speed electrical stirrer in a way that a uniform mixture (free from lumps) is formed Allow the mixture to rest for 2-3minutes for polymers to act. Remix the mixture before use AR BLOCK SET/V-LITE BLOCK SET is self curing, No Additional curing is required.
ONE BAG OF 40 KG PER ONE CBM OF WORK
APPLICATION GUIDELINES
1.1 - Stacking & handling of blocks at site
- Stacking of blocks should be done on a dry and proper leveled surface.
- Blocks should be kept free from direct rain. Height of stack should not be more than 1.5meters.
- Preferably use pallets to keep the blocks.
- Keep the blocks in systematic array to avoid point loading, also making it easy to count.
- Minimize handling. Do not throw the blocks in handling.
- There should not be any foreign material between two blocks, as due to point loading, a block may crack or damage while stacking.
- Store material consignment wise enabling easy counting & quality verification post unloading.
1.2 - Before AAC Wall construction, Inspection of column & beam and it shacking to be done
- Column should be straight enough and have sufficient strength. Straightness between columns to column must be correct.
- Structural Beam should be given proper time to settle and cure. It should not have the possibility to deflect after the construction of the wall. Deflection of the beam May impose line load on wall and wall may crack.
- Hacking of column provides a positive key for jointing mortar. Hacking should be done just after the construction of column otherwise on later stages, it becomes difficult to provide hacking as it gains complete strength. We can do hacking using heavy pointed hacking tools or use Chisel and Hammer. There are certain chemicals available in the market which after application on beam and column avoids manual hacking.
2 - Wall Thickness
- The Minimum thickness of non-load bearing internal walls shall be 100 mm. The minimum thickness of external walls in framed construction shall not be less than 200 mm however depending upon the local condition and desired effect of thermal transmission and sound reduction, 150 mm thick block wall may be used. The minimum thickness of external and internal load-bearing walls shall be 200mm and 150mm respectively. For parapet walls unless adequately braced at intervals not exceeding 3m. the height of the wall shall be limited to five times its thickness.
3 - Mortar
- As per IS-6041 (Clause 3.9.2), a 1:2:9 Cement: Lime: Sand mortar may generally be used but where either the intensity of load is high or wall is exposed to severe condition 1:1:6 mortar shall be used. 1:6 cement: sand mortar may also be used.
4 - Thickness of joints
- Thickness of joints should be kept 10-12 mm in case of traditional mortar or 2-3 mm in case of thin bed jointing mortar.
Method of Wetting of Blocks before
1 - Use
- Surface wetting of blocks is required just before use. For wetting, you can dip the blocks in a water bucket for a few seconds. You can use other methods depending upon site condition & convenience. For each method, we need to understand the purpose of wetting. All high porosity building elements including AAC sucks water from a mortar at the time of application. Due to lack of water, the mix may get shrink or crack due to excessive heat of hydration, and required adhesion and compressive strength of mix is reduced. So, it is necessary to pre-wet the blocks just before use.
2 - Laying of the first course of AAC Blocks
- The first course of AAC block masonry wall shall be laid with greater care making sure that it is properly aligned, levelled, and plumbed, as this may assist the mason in laying succeeding courses to obtain a straight and truly vertical wall. The first layer of AAC blocks masonry on the plinth should 1.2 Wall thickness 1.3 Mortar 1.4 Thickness of joints 1.6 Use APPLICATION GUIDELINES (Stepwise): ONE BAG OF 40 KG PER ONE CBM OF WORK 1.5 Method of Wetting of Blocks before 1.7 Laying of the first course of AAC Blocks preferably have a groove/offset outside so that rainwater coming down the wall falls out. Before laying the first course, the alignment of the wall shall be marked on the damp-proof course. The blocks for the course shall first be laid dry, that is, without mortar along a string stretched between properly located corners of the wall in order to determine the correct position of the blocks including those of the cross walls jointing it and also adjust their spacing. When the blocks are set in the proper position, the two corner blocks shall be removed, a mortar bedspread, and these blocks laid back in place truly level and plumb. The string shall then be stretched tightly along with the faces of two corner blocks and the faces of the intermediate ones adjusted to coincide with the line. Thereafter, each block shall be removed and re-laid over a bed of mortar. After every three or four blocks have been laid. Their correct alignment, level, and verticality shall be carefully checked. It is recommended to give a drying time of 24 hours for the first course and then subsequent courses should be started.
3 - Gap filling between column and AAC Block
- At least a 10mm gap must be provided between the concrete column and AAC wall and the gap must be filled using lean mortar. Use suitable wall tie after every 3rd course of AAC block between beam and Wall.
4 - Gap filling between beam and AAC Block
- The gap should be planned at the time of design planning between beam and AAC blocks. The beam may have a tendency to deflect due to its own weight or weight of upper stories construction. Deflection of beam imposes a point load or line load on the wall, due to which wall may get crack. Moreover, a beam may shrink or expand after setting. For this purpose, a suitable gap is provided between beam and wall so that deflection of the beam may not impose any load on the wall. It is recommended to provide 15-20 mm space in between beam and uppermost course. Fill this gap using suitable flexible backing rods & lean mortar/ resilient material paste. The backing rods should be installed leaving 10 mm gaps for both sides so the lean mortar/resilient material paste can be applied within those gaps.
5 - Provision of control Joint
- All type of building material have the tendency to expand or contract including a clay brick wall. To Control Possible Cracking in the wall due to shrinkage or expansion, it is recommended to provide a control joint. Control Joint sare vertical separations of the wall. Movement and flexibility are required in all building elements, movement joints should be considered during wall construction for this purpose, it is suggested to leave a space of10mm after every 3-meter in length for long walls from corners. i.e. After every 3-meter running length, an expansion joint must be given from the corner. On lengthy walls, vertical movement joint must be given after every 6-meter maximum. For filling the gap, may use the foam backing rod. The backing rodis resilient in nature and compresses easily. It is as mall foam rod that is used to fill the joints between building materials. Fill the gap with suitable resilient material or lean mortar. In the case of a coustic separating walls, an expansion joint must not be given. Movement control mesh may also be used after every 2-3 courses as per requirement. In the case of using thin-bed jointing mortar, Flexible control mesh is well suited for horizontal movement control and it also does not affect the thickness of thin-bed joint mortar.
6 - Provision of Nominal Bond Beam in Wall
- A Horizontal Reinforced bond beam must be provided to provide adequate stability, stiffness, and strength to all types of all walls including AAC so its slenderness ratio can be maintained. It also serves as a means of crack control. The nominal bond beam must be constructed the same as the structural bond beam using 8 mm mild steel bars or 6 mm deformed steel bars. In a wall without opening the bond beam shall be spaced at heights of 1200mm apart and may be of any length up to 18 meters. The nominal bond beam shall be discontinuous at the control joint. Dummy Joints shall be formed when the bond beam is continuous at control Joints.