Page 61 - Demo

AAC WORLDWIDE %u2022 2.2026 APPLICATION & CONSTRUCTION 59Specification & methodologyThe SMMR shall be embedded in premix AAC block joining mortar (BJM) in 4-5 mm thickness. In case of conventional cement/sand mortar, the joint thickness can be 10-12 mm. The AAC block shall have a minimum compressive strength of 4 N/mm2. The BJM shall have a minimum tensile adhesion strength of 0.4 N/mm2, a split tensile strength of 0.4 N/mm2, and a compressive strength of 7 N/mm2 at 28 days.Typically, for a 4 m long and 3 m high AAC block wall (non-load bearing) with a thickness of 100/125 mm, a minimum of 6 layers of SMMR in 40 mm width shall be placed on the AAC blocks. In case of AAC Block thicknesses of 150 mm, a minimum of 4 layers of 80 mm width, and in case of 200 mm AAC blocks, a minimum of 5 layers of SMMR in 80 mm width shall be placed on the AAC blocks. However, depending on specific requirements like lateral load or wind load, wall dimensions, etc., the number of SMMR layers shall vary, which will be designed in line with structural guidelines laid down in BS EN 1996-1-1:2005+A1:2012.In both the cases of SMMR 40 mm and 80 mm, the first layer shall be placed on the first course of AAC blocks, the second layer shall be placed on the third course of AAC blocks, and the last layer shall be placed below the last AAC block course. The remaining layers shall be equally distributed in the courses of AAC block work. At the edges, the SMMR need to be anchored properly using steel cleat angles with a minimum size of 50 mm x 50 mm x 3 mm, proper nailing, and screwing to be done with the RCC column or RCC mullion or wall as applicable.Illustration of the application processes.Criteria RemarksWall Thickness 100 mm and 200 mmMurfor Compact is effective in crack control, energy dissipation and ductility while placed in requisite numbers in line with the design guideline of minimum steel requirement w.r.t wall thickness.Seismic Zone (Low to Moderate)Murfor Compact is an alternative to RCC Band system.Seismic Zone (High)Murfor Compact improves ductility, but not sufficient as standalone reinforcement. Additional band system may require depending on slenderness factor, position of wall etc.Load Capacity RequirementMurfor Compact may perform as equivalent (%u00b115% to %u00b120%) to RCC band system depending on construction of masonry and loading requirement.Ease of ConstructionMurfor Compact easy installed within mortar joints, no extra shuttering or concreting required.Failure Mode ControlMurfor Compact prevents sudden cracking, delays collapse, enhances displacement capacity while anchored at the edges.Best Use CaseDuctility enhancement, distributed reinforcement, non-seismic or moderate seismic zones, thicker AAC walls. However, the wall needs to be designed with Murfor Compact by a structural consultant/expert in line with Manufacturer%u2019s guidance and codal requirement.Table 4: Summary of laboratory test findings