The 1994 standard outlines detailed procedures for building walls using precast concrete stone masonry blocks, addressing materials, structural integrity, reinforcement, moisture control, and construction methods. It serves as a crucial reference for engineers and builders to ensure robust, efficient, and visually pleasing masonry walls compliant with Indian construction regulations.
Overview
The 1994 standard outlines detailed procedures for building walls using precast concrete stone masonry blocks, addressing materials, structural integrity, reinforcement, moisture control, and construction methods. It serves as a crucial reference for engineers and builders to ensure robust, efficient, and visually pleasing masonry walls compliant with Indian construction regulations.
Audience
Contents
Structure
Overview of Scope for Construction Code
Core Reference Standards and Specifications
| IS Code | Description | Purpose |
|---|---|---|
| IS 2:1960 | Numerical rounding rules | Standard rounding methods |
| IS 1905:1987 | Masonry code of practice | Definitions and terminology |
| IS 2212:1991 | Brick masonry code of practice | Masonry construction standards |
| IS 12440:1988 | Masonry units test methods | Testing procedures |
| IS 436:1978 | Steel reinforcement specifications | Material properties |
Key Definitions Referenced
| Original Value | Rounded Value (Significant Figures) |
|---|---|
| 12.345 | 12.3 |
| 0.00456 | 0.0046 |
| 123.45 | 123.5 |
For comprehensive definitions, refer to the cited Indian Standards.
Material Specifications and Reinforcement Details
| Property | Mild Steel | Tor Steel | Cold Twisted Steel |
|---|---|---|---|
| Yield Strength (MPa) | ~250 | 415-500 | 350-500 |
| Tensile Strength (MPa) | 400-500 | 500-600 | 500-600 |
| Elongation (%) | 12-16 | 10-14 | 12-15 |
Guidelines for Planning Masonry Walls
| Given Value | Rounded Value |
|---|---|
| 12.345 (3 s.f.) | 12.3 |
| 0.00789 (2 s.f.) | 0.0079 |
Proper Storage and Handling Protocols
| Parameter | Recommendation |
|---|---|
| Maximum stacking | 8 bags |
| Storage environment | Dry, sealed shed |
| Stacking approach | FIFO |
| Ground contact | Avoid using pallets |
Setting Out Procedures for Masonry Walls
Scaffolding Design and Safety Guidelines
| Load Type | Typical Value |
|---|---|
| Dead Load | Self-weight of scaffold |
| Live Load | 2 kN/m² (workers, materials) |
| Impact Load | 10-20% of live load |
Guidelines for Wetting Blocks Before Laying
| Climate Condition | Block Wetting | Mortar Adjustment | Joint Treatment |
|---|---|---|---|
| Normal | Dry blocks | Adjust mortar to suction | Cement-sand mortar (1:6) |
| Hot and Dry | Light surface wetting | Adjust mortar to suction | Cement-sand mortar + plastering |
Instructions for Proper Block Placement
Strategies to Minimize Cracking in Block Masonry
Finishing Requirements for Masonry Walls
Details of the Technical Committee Behind the Standard
Indian Standards Referenced in IS 14213
These referenced codes provide definitions, material specifications, and design principles essential for the effective application of IS 14213.
Frequently Asked
Precast concrete stone masonry units must adhere to the requirements of IS 12440:1988, which covers dimensions, compressive strength, water absorption, and durability standards. Reinforcement principles for masonry, as outlined in IS 2212:1991, are applicable to these blocks. Typically, blocks should have a minimum compressive strength around 7 N/mm² and water absorption not exceeding 8%. Uniform block shape and smooth finishes are essential to ensure quality masonry construction.
Vertical reinforcement bars should be installed at corners and openings using special precast blocks with recesses as specified in IS 12440:1988. These enable easy placement and continuity of vertical steel reinforcement, enhancing seismic resistance. Partition walls require reinforcement in their lower courses to manage deflections caused by floor slab movements during earthquakes. All reinforcing materials must comply with IS 436:1978 standards.
Use precast concrete stone blocks with water absorption around 12% to achieve moisture resistance comparable to brick masonry. Fill joints and gaps between stone pieces and concrete with cement-sand mortar mixed at least in a 1:6 ratio, and plaster or render the external wall face, especially in areas of heavy rainfall. Employ cavity walls or maintain external wall thicknesses of 15-20 cm to reduce moisture ingress. Additionally, apply damp-proof courses and carefully detail around openings as per IS 2212:1991.
Shrinkage cracks are controlled by using mortar weaker than the masonry blocks, which helps confine cracks to the joints. Controlled joints should be introduced at intervals of 8 to 10 meters for free-standing walls and 15 to 18 meters where cross walls provide support. Metal reinforcement bars should be embedded at critical points like openings or abrupt section changes. Surface plastering with cement-sand mortar (not leaner than 1:6) reduces moisture penetration that could exacerbate cracking.
At T-junctions where walls have equal thickness (e.g., two 20 cm or two 15 cm walls), vertical joints are broken in alternate courses using smaller-sized blocks such as 2/3 or 3/4 length blocks. For walls of unequal thickness, where direct block-to-block bonding isn't feasible, 20 cm long, 6 mm diameter steel bars are placed in alternate mortar courses to ensure structural integrity. The bonding patterns for corners and T-junctions, including those involving 30 cm and 20 cm walls, are detailed in IS 14213 figures and clauses.
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