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IS 6452:1989 is the Indian Standard (BIS) for high alumina cement for structural use - specification. This standard specifies the manufacturing process, chemical composition, and physical properties for high alumina cement (HAC). It outlines mandatory requirements for strength, setting time, and soundness, along with the necessary testing procedures. The standard includes a crucial appendix warning against the improper use of HAC in structures due to potential strength loss from 'conversion'.
Specifies requirements for high alumina cement used in structural applications, including properties like setting time and strength.
! The most critical consideration for HAC is the 'conversion' phenomenon, where the cement's hydration products change in warm (>25°C), moist conditions, leading to a significant loss of strength and increased porosity. Its use in load-bearing structures is therefore highly restricted.
! HAC must never be mixed with Ordinary Portland Cement (OPC) or lime, as this can cause a 'flash set' and unpredictable long-term behavior.
! It is primarily suitable for applications requiring rapid hardening, high-temperature resistance (refractory concrete), or resistance to chemical (sulfate) attack.
high alumina cementcalcium aluminate cementrefractory cementcement
International Equivalents
Similar International Standards
ASTM C150/C150M - 22ASTM International, USA
HighCurrent
Standard Specification for Portland Cement
Defines types of Portland cement; white cement is typically a Type I or III meeting additional whiteness requirements.
EN 197-1:2011CEN (European Committee for Standardization), Europe
HighCurrent
Cement - Part 1: Composition, specifications and conformity criteria for common cements
Specifies CEM I (Portland cement) which is the basis for white cement, though whiteness is a supplementary property.
GB/T 2015-2017Standardization Administration of China (SAC), China
HighCurrent
White Portland Cement
Direct equivalent standard specifically covering composition, grading, and testing of white Portland cement.
Key Differences
≠IS 6452 specifies a minimum whiteness of 70% (Hunter scale), whereas whiteness is not a mandatory specified property in ASTM C150 or EN 197-1 and is agreed upon between the manufacturer and purchaser.
≠IS 6452 defines a single strength grade (minimum 28-day compressive strength of 33 MPa). In contrast, EN 197-1 offers multiple strength classes (e.g., 32.5, 42.5, 52.5), providing more variety.
≠The maximum permissible Magnesia (MgO) content in IS 6452 is 6.0%, which is higher than the 5.0% limit specified in EN 197-1.
≠IS 6452 sets a specific maximum limit for Iron(III) Oxide (Fe2O3) at 0.9%, which is fundamental for its whiteness. ASTM C150 and EN 197-1 do not specify a general limit for Fe2O3, as it is implicitly controlled by the manufacturer to achieve the desired whiteness.
Key Similarities
≈All standards are based on the same fundamental material: Portland cement clinker produced by firing limestone and clay, with low iron and manganese content for whiteness.
≈All standards mandate testing for soundness (dimensional stability) to prevent delayed expansion. Both IS 6452 and EN 197-1 specify a maximum expansion of 10 mm using the Le Chatelier method.
≈The core performance is evaluated by compressive strength testing at specified ages (e.g., 3, 7, and 28 days), which is a common principle across all standards.
≈All standards specify requirements for setting time, defining minimum initial set times for workability and maximum final set times to ensure proper hardening.
Parameter Comparison
Parameter
IS Value
International
Source
Whiteness (% Reflectance)
≥ 70 (or as agreed)
Not specified (by agreement)
ASTM C150
Compressive Strength (28 days)
≥ 33 MPa
≥ 42.5 MPa (for Class 42.5 N)
EN 197-1
Magnesia (MgO) Content, %
≤ 6.0
≤ 5.0
EN 197-1
Sulphuric Anhydride (SO3) Content, %
≤ 3.0
≤ 3.5 (for CEM I)
EN 197-1
Initial Setting Time (minutes)
≥ 30
≥ 45 (for Type I, II, V)
ASTM C150
Final Setting Time (minutes)
≤ 600
≤ 375 (Vicat Test)
ASTM C150
Soundness, Le Chatelier (mm)
≤ 10
≤ 10
EN 197-1
Iron(III) Oxide (Fe2O3) Content, %
≤ 0.9
Not specified in standard
ASTM C150
⚠ Verify details from original standards before use
Key Values7
Quick Reference Values
Minimum Alumina (Al2O3) content by mass32%
Ratio of % Alumina (Al2O3) to % Lime (CaO)0.85 to 1.30
Minimum initial setting time30 minutes
Maximum final setting time600 minutes
Minimum 1-day compressive strength30.0 MPa
Minimum 3-day compressive strength35.0 MPa
Maximum expansion in Le Chatelier test5 mm
Tables & Referenced Sections
Key Tables
Table 1 - Chemical Requirements
Table 2 - Physical Requirements
Key Clauses
Clause 3 - Manufacture
Clause 4 - Chemical Requirements
Clause 5 - Physical Requirements
Clause 10 - Rejection
Appendix A - Note on the Use of High Alumina Cement
Why is High Alumina Cement not used for general building structures?+
Due to the risk of 'conversion' in warm, moist environments, which causes a significant and unpredictable loss of strength and durability. This is detailed in Appendix A.
What is the minimum compressive strength for HAC at 1 day?+
The minimum 24-hour compressive strength is 30 MPa, as per Table 2. This rapid strength gain is its key feature.
What are the main chemical requirements for HAC?+
The total alumina (Al2O3) content must be at least 32%, and the ratio of Al2O3 to lime (CaO) must be between 0.85 and 1.30, as specified in Table 1.
Is this standard still active?+
Yes, IS 6452:1989 has been reaffirmed (most recently in 2021) and is the current standard for HAC in India, though its use in structural applications is limited by other codes like IS 456.