Precast Reinforced Concrete Door and Window Frames

IS 6523: Scope & Related Specifications

Scope Summary:

• IS 6523 covers specifications for frames (context implies steel or structural frames).
• Frames may be marked with the BIS Standard Mark as per Clause 10.1.1, ensuring compliance with BIS inspection and quality control.

Key Related IS Codes (Appendix A, Table 1):

Sampling & Conformity (Clauses 8.1 & 8.2):

• Sampling procedures and criteria for conformity are outlined to ensure product quality.
• Scale of sampling is defined in Appendix B.

Practical Notes:

• Use IS 456-1978 for concrete design related to frames.
• Use IS 432 and IS 1786 for steel reinforcement specifications.
• Ensure all materials comply with respective IS standards for cement, aggregates, and steel.

flowchart LR
    A[Raw Materials] --> B[Manufacturing Frames]
    B --> C[Quality Control & Testing]
    C --> D{Conformity to IS 6523?}
    D -- Yes --> E[Mark with BIS Standard Mark]
    D -- No --> F[Reject / Reprocess]

This ensures frames meet BIS quality & safety standards under IS 6523 scope.

IS 6523: Shape and Dimensions for Precast Reinforced Concrete Door & Window Frames

Key Specifications (Clause 2.1 & 2.1.1)

• Cross-sectional dimensions:
  • Single shutter door:
    • 60 mm × 100 mm or 70 mm × 75 mm
  • Double shutter door:
    • 60 mm × 120 mm
• Tolerance on cross-sectional dimensions: ±2 mm

Overall Dimensions (Refer IS 4021-1976 for frame sizes)

• Width = total length of horizontal member (out-to-out)
• Height = total height from lowest vertical end (3-member frame) or outer edge of lower horizontal member (4-member frame) to top horizontal edge

Notes

• Cross-section shape may be adjusted (e.g., groove for plaster) if overall dimensions remain unchanged.
• Optional mild steel angle or other suitable arrangements allowed for one-piece frames.

Typical Cross-Section Dimensions Summary

Diagram Reference (Fig 2 & 3)

• Shows fixing details, hinge arrangements, and sectional views.
• Includes aluminum tube sleeves, machine screws, wire fixtures, and wooden fillet covers.

graph TD
A[Precast RCC Frame] --> B{Cross-section}
B --> C[Single Shutter: 60x100 or 70x75 mm]
B --> D[Double Shutter: 60x120 mm]
A --> E{Overall Dimensions}
E --> F[Width: Horizontal out-to-out]
E --> G[Height: Vertical lowest to top edge]

For detailed fixing arrangements and sectional views, refer to Figures 2 and 3 of IS 6523.

IS 6523 - Materials for Precast RCC Door & Window Frames

Key Specifications from IS 6523:

• Cement Types (Clause 3.1 & Table 1):

  • Ordinary Portland Cement (IS 269-1976)
  • Portland Slag Cement (IS 455-1976)
  • Portland Pozzolana Cement (IS 1489-1976)
  • Rapid Hardening Portland Cement (IS 8041-1978)
  • High Strength Ordinary Portland Cement (IS 8112-1976)

• Aggregates:

  • Coarse & Fine Aggregates as per IS 383-1970
  • Concrete mix to be dense, minimum grade M20 (IS 456-1978)

• Reinforcement:

  • Mild Steel & Medium Tensile Steel Bars (IS 432 Part I-1966)
  • High Strength Deformed Bars (IS 1786-1979)
  • Mild Steel Wire (IS 280-1978)

• Concrete Finish (Clause 4.1.2):

  • Dense surface finish with no visible coarse aggregate
  • No crevices to prevent corrosion or disintegration

Concrete Mix Requirements:

• Minimum concrete grade: M20
• Mix design as per manufacturer but ensuring dense concrete (IS 456-1978)

Relevant IS Code References:

Summary Diagram of Material Flow

graph LR
A[Cement] --> C[Concrete Mix (M20 or above)]
B[Aggregates] --> C
D[Reinforcement Bars & Wire] --> E[Precast

IS 6523 - Manufacture of Precast Reinforced Concrete Door & Window Frames

Key Specifications & References:

• Materials must comply with Table 1 (Appendix A) referencing relevant IS codes:
  • Cement: IS 269, IS 455, IS 1489, IS 8041, IS 8112
  • Aggregates: IS 383
  • Steel Reinforcement: IS 280, IS 432 (Part 1), IS 1139, IS 1786
  • Concrete: Minimum grade M20 as per IS 456-1978

Concrete Mix:

• Manufacturer determines mix proportion to achieve dense concrete with compressive strength ≥ M20.
• Follow IS 456 for mix design and IS 516 for strength testing.

Sampling & Quality Control:

• Sampling & conformity criteria per Appendix B.
• Manufacturer’s certificate required confirming compliance.

Marking:

• Each frame may bear the Standard Mark as per Clause 10.1.1, ensuring BIS certification and quality assurance.

Summary Table of Key IS Codes for Materials:

flowchart TD
    A[Raw Materials] --> B[Cement (IS 269/455/1489)]
    A --> C[Aggregates (IS 383)]
    A --> D[Steel Reinforcement (IS 432/1139/1786)]
    B & C & D --> E[Concrete Mix Design (≥ M20 per IS 456)]
    E --> F[Precast Frame Manufacturing]
    F --> G[Sampling & Testing (IS 516, Appendix B)]
    G --> H[Manufacturer's Certificate & Marking]

**Ensure all materials and processes comply with referenced IS codes for

IS 6523: Arrangements for Door and Window Fixtures

Key Specifications & Arrangements (Clause 5.6 & 6)

• Hinge Fixing (Clause 5.6):

  • Use 2 mild steel flats (30x5 mm, 70 mm long) embedded in RCC frame.
  • Hinges welded to these flats; gas welding recommended.
  • Ensures strong hinge anchorage in precast RCC frames.

• Fixture Arrangements (Clause 6 & Fig. 3):

  • Use mild steel angle iron or equivalent for one-piece frames (optional).
  • Fixings include:
    • 5 mm machine screws with aluminium tube sleeves.
    • 0.8 mm mild steel wire for additional support.
    • Wood screws and wire fixtures for timber frames.
    • Bolts & nuts covered with wooden fillet for neat finishing.
  • Grooves in RCC frames filled after hinge fixing to ensure flush surface.

• Fixtures for Tower Bolts & Sliding Bolts (Clause 6.1):

  • Provide suitable embedded arrangements in frames (see Fig. 4 in IS 6523).
  • Ensure secure and flush fitting of all door/window hardware.

Summary Table: Hinge Fixing Components

graph LR
A[RCC Frame] --> B[Mild Steel Flats (30x5x70 mm)]
B --> C[Hinge Welded to Flats]
A --> D[Groove Filled Post-Fixing]
C --> E[Door/Window Shutter]
F[Fixtures for Tower/Sliding Bolts] --> A

Note: Refer to IS 6523 Fig. 3 & 4 for detailed sectional views and dimensions

IS 6523: Installation Key Points for Precast RCC Door & Window Frames

Installation Specifications:

• Maximum Opening Width: 2.25 m (Clause 2.25)
• Fixing Hinges:
  • Hinges can be fixed on timber or directly on RCC frame (Fig. 3: 3D, 3E, 3F, 3G)
  • Use grooves filled with suitable materials for hinge fixing
• Optional Frame Reinforcement:
  • Mild steel angle iron or equivalent may be used for one-piece frames (Clause 1.5)
• Fixing Components:
  • 5 mm machine screws, aluminum tube sleeves, mild steel wire (0.8 mm), bolts and nuts with wooden fillets, and wooden blocks (Fig. 2 & 3)

Tolerances & Marking:

• Tolerances for frame cross-sections are specified (Clause 3.1)
• Frames may carry BIS Standard Mark indicating compliance and quality control (Clause 10.1.1)

Related IS Codes for Materials & Testing:

Typical Fixing Arrangement (Simplified Diagram):

graph LR
A[Precast RCC Frame] --> B[Groove Filled]
B --> C[Hinge Fixed]
C --> D[Timber Frame / RCC Frame]
D --> E[Machine Screws & Bolts]
E --> F[Wooden Block & Fillet]

Summary:
Use mild steel or suitable fixing arrangements, restrict opening to ≤2.25 m, fix hinges in grooves filled properly, and follow BIS marking and tolerance guidelines. Refer to related IS codes for material specs and testing.

IS 6523: Jointing and Grouting Key Points

1. Cement Slurry for Grouting (Clause 7.3)

• Use a cement:sand ratio of 1:1 for grouting joints between vertical and horizontal door frame members.
• Alternatively, epoxy resin or chemical loading agents may be used for better bonding and durability.
• Ensure dense slurry to fill all crevices and avoid voids.

2. Concrete Specifications (Clause 3.3 & 4.1.2)

• Use concrete of minimum grade M20 (as per IS 456-1978).
• Concrete must have a dense surface finish with no visible coarse aggregate.
• Avoid crevices to prevent rusting of embedded steel and concrete disintegration.

3. Material Requirements (Table 1, Clause 3.1)

4. Aggregate Size (Clause 3.2)

• Use well-graded aggregates.
• Max nominal size of coarse aggregates: 10 mm.

Summary Formula for Cement Slurry Mix:

[ \text{Cement : Sand} = 1 : 1 ]

flowchart LR
    A[Vertical & Horizontal Members] --> B[Joint]
    B --> C[Cement-Sand Slurry (1:1)]
    B --> D[Epoxy Resin (Alternative)]
    C & D --> E[Dense Grouting, No Voids]
    E --> F[Durable Joint]

This ensures a strong, durable, and corrosion-resistant joint between frame members.

IS 6523 - Optional Requirements for ECO Mark (Clause 8)

The ECO Mark is an optional environmental labeling scheme administered by BIS to promote eco-friendly products. Key points:

• Eligibility: Product must carry the ISI Mark and meet additional environmental criteria.
• Marking: ECO Mark is combined with ISI Mark as a single symbol.
• Voluntary: Manufacturers may opt for ISI Mark alone or with ECO Mark.

Key Specifications:

• Consent Clearance: Manufacturer must submit clearances from:
  • State Pollution Control Board (Water Act 1974, Air Act 1981, Cess Act 1977)
  • Authorization under Environment (Protection) Act 1986
• Product Packaging: May display brief criteria for eco-friendliness.
• Compliance: Must meet environmental rules from Forest Department and other authorities.

Summary Table:

This ensures products are environmentally compliant and promotes sustainable manufacturing.

IS 6523 - Sampling and Inspection (Clause 8.1, Appendix B)

Key Points:

B-1. Scale of Sampling

• Sampling method and conformity criteria are per Appendix B.
• Samples are drawn randomly from the lot or sub-lot.
• To ensure randomness:
  • Arrange frames serially.
  • Select every rᵗʰ frame, where
    [ r = \text{Integral part of } \frac{N}{n} ]
    • N = lot/sub-lot size
    • n = sample size

B-1.1 Number of Samples (Table 2)

• Number of frames to sample depends on lot size.
• Refer Table 2 (not fully provided here) for sample size vs. lot size.

B-2. Number of Tests

• Number of tests to be conducted on samples is specified in the code (not detailed here).

Summary Table (Conceptual)

Sampling Process Diagram

flowchart TD
    A[Arrange frames serially] --> B[Calculate r = floor(N/n)]
    B --> C[Select every rᵗʰ frame]
    C --> D[Collect n samples]
    D --> E[Perform tests]
    E --> F[Check conformity]

Note: For exact sample sizes and test numbers, refer to Table 2 and related clauses in IS 6523 Appendix B.

IS 6523 — Marking of Door, Window, and Ventilator Frames

Key Marking Requirements (Clause 10.1)

• Marking Location: On the face of the frame that contacts masonry.
• Marking Details:
  • Manufacturer's name or trade-mark
  • Year of manufacture
  • Overall height and width of frame
• Marking Quality: Must be clear and indelible.

Use of Standard Mark (Clause 10.1.1)

• Frames may be marked with the BIS Standard Mark, indicating compliance with IS standards and quality control.
• Use of the Standard Mark is regulated by the Bureau of Indian Standards Act, 1986.

Additional Notes

• Frames include a 6 mm thick MS plate with a hole for tower bolt fixing (Fig 4).
• Concrete for frames must be at least Grade M20 (IS 456:1978).
• Dimensions and marking must be in millimeters.

Summary Table for Marking

flowchart TD
    A[Frame Face Contacting Masonry] --> B[Mark Manufacturer Name/Trade-mark]
    A --> C[Mark Year of Manufacture]
    A --> D[Mark Overall Height & Width]
    A --> E{Optional: BIS Standard Mark}

This ensures traceability and quality assurance as per IS 6523.

Key Referenced Indian Standards in IS 6523

IS 6523 refers to several Indian Standards relevant to materials and testing for concrete and reinforcement:

Important Notes:

• Concrete mix should not be weaker than Grade M20 as per IS 456-1978.
• The Standard Mark on frames confirms compliance with BIS inspection and quality control.
• Sampling and conformity criteria for dimensional requirements are specified (see Clause 1.1.2).

Sample Size and Permissible Defects (Dimensional Requirements)