Specification for apparatus for measurement of water retentivity of masonry cement

IS 10850: Scope - Key Specifications and Materials

Scope: IS 10850 specifies apparatus and materials for testing hydraulic cement and pozzolanic materials, focusing on water retention tests.

Key Materials (Clause 2.1, Table 1)

Construction Highlights

• Filter paper diameter: 150 mm
• Perforated dish: Brass plated, perforation details per Clause 1.4-1.6
• Accessories: Three-way stopcock, mercury manometer, pressure control device

Additional References

• Flow table and accessories per IS 5512-1983
• Tamping bar per IS 4031-1968 (Clause 9.3.5)
• Rounding off test results as per IS 2-1960

Summary Diagram of Apparatus Components

graph TD
    A[Perforated Dish] --> B[Funnel]
    B --> C[Flask]
    C --> D[Filter Paper]
    A --> E[Three-way Stopcock]
    E --> F[Pressure Control Device]
    F --> G[Mercury Manometer]

This scope ensures standardized materials and apparatus for reliable water retention testing of cementitious materials.

IS 10850: Materials for Apparatus Construction

Key Materials (Table 1, Clause 2.1)

Important Notes:

• Materials must resist attack by masonry mortar to ensure durability.
• Filter paper grade is critical for consistent water retention testing.

Additional Specifications:

• Filter paper diameter: 150 mm (Clause 1.4)
• Apparatus assembly includes perforated dish details and pressure control devices.

Summary Diagram of Materials and Components

graph TD
A[Apparatus Components] --> B[Perforated Dish]
A --> C[Funnel]
A --> D[Flask]
A --> E[Filter Paper]

B --> F[Brass (plated) or resistant material]
C --> F
D --> G[Glass]
E --> H[Carl Schleicher/Whatman equivalent]

This ensures material compatibility for reliable water retentivity measurement in masonry cement testing.

IS 10850: Construction - Key Specifications & Materials

Materials of Construction (Table 1, Clause 2.1)

Construction Details (Clause 3 & Fig. 1)

• Apparatus assembly includes: perforated dish, filter paper (150 mm diameter), funnel, three-way stopcock, mercury manometer, pressure control device.
• All dimensions are in millimeters.
• Tamping bar as per IS:4031-1968 (Clause 9.3.5).

Important Notes:

• Use materials that resist attack by masonry mortar to ensure durability.
• Filter paper must conform to specified grades for consistent testing.
• Final test values should be rounded per IS:2-1960 to maintain precision.

Summary Diagram of Apparatus Assembly

graph LR
    A[Perforated Dish] --> B[Filter Paper (150 mm dia)]
    B --> C[Funnel]
    C --> D[Three-way Stopcock]
    D --> E[Pressure Control Device]
    E --> F[Mercury Manometer]

This ensures proper flow and measurement in water retention tests per IS 10850.

IS 10850: Marking and Certification - Key Points

Marking Requirements (Clause 4.1):
Each apparatus component shall be clearly and indelibly marked with:

• Manufacturer's name or registered trademark
• Date of manufacture

Marking must not interfere with apparatus performance.

ISI Certification Mark (Clause 4.1.1):

• Use governed by Indian Standards Institution (Certification Marks) Act.
• ISI mark assures compliance with the standard via inspection, testing, and quality control.
• Continuous ISI surveillance ensures conformity.
• Licence conditions available from ISI.

Materials of Construction (Table 1, Clause 2.1)

Summary Diagram of Marking Process

flowchart LR
    A[Manufacturing] --> B[Marking on Components]
    B --> C{Marking Details}
    C -->|Manufacturer Name| D[Indelible Mark]
    C -->|Date of Manufacture| D
    D --> E[No Interference with Performance]
    E --> F[ISI Certification Mark (optional)]
    F --> G[Quality Control & Inspection]
    G --> H[License & Continuous Surveillance]

For detailed licensing and certification procedures, contact the Indian Standards Institution.

IS 10850: Key References, Materials & Specifications

1. Materials of Construction (Clause 2.1, Table 1)

2. Related IS Standards for Instruments

• IS 5512-1983: Flow table for hydraulic cement tests
• IS 5513-1976: Vicat apparatus
• IS 5514-1969: Le-Chatelier's test apparatus
• IS 5515-1983: Compaction factor apparatus
• IS 7320-1974: Concrete slump test apparatus
• IS 9376-1979: Aggregate crushing value apparatus
• IS 10078-1982: Jolting apparatus for cement testing
• IS 10510-1983: Vee-bee consistometer

3. Apparatus Assembly (Fig. 1)

• Includes perforated dish, filter paper (150 mm dia.), three-way stopcock, mercury manometer, and pressure control device.
• All dimensions in millimeters.

Summary Diagram: Apparatus Components

graph LR
A[Perforated Dish] --> B[Filter Paper (150 mm dia.)]
B --> C[Flask (Glass)]
A --> D[Funnel (Brass plated)]
C --> E[Pressure Control Device]
E --> F[Mercury Manometer]
E --> G[Three-way Stopcock]

This summary provides essential materials, related IS codes, and apparatus components for water retention testing as per IS 10850.