ASTM C465
ASTM C465 Standard Specification for Processing Additions for Use in the Manufacture of Hydraulic Cements
The ASTM C465 standard outlines criteria and tests for determining the suitability of processing additions in hydraulic cement production. Here is an informative article structured in bullet points about this standard:
Scope of ASTM C465:
Pertains to criteria and tests for processing additions in hydraulic cements.
Assesses if these additions meet requirements in Specifications C 150, C 1157, C 845, and C 595.
Former ASTM Specifications (C 150 – 62, C 205 – 58 T, C 340 – 58 T, C 358 – 58) are considered compliant.
Safety Hazards and Referenced Documents:
Addresses safety concerns associated with the test methods.
Includes a list of referenced ASTM Standards such as C 33, C 39, C 78, C 109/C 109M, and others.
Materials and Cement Testing:
For general use in Portland cement, tests should be conducted on cements from at least five different clinkers.
Specifies types of cements and requirements for clinkers, including Type I, Type II, and Type III cements.
In cases where additions are limited to specific types of cement or single plants, appropriate tests and procedures are outlined.
Details the required chemical composition and fineness for control and test cements.
General Requirements for Processing Additions:
Must conform to the respective requirements in this specification.
The trade name, source, character, and quantitative determination methods should be provided by the sponsor.
The specific gravity and water content of liquid processing additions are also required.
Evaluation of Processing Additions:
Involves comparing cements with and without the additions.
Establishes the amount of addition for evaluation purposes.
Cements produced for evaluation must comply with relevant specifications and show the effect of the addition within specified limits.
Sampling Cement and Test Methods:
Samples should be taken during grinding and stored in sealable containers.
Test methods include chemical analysis, compound composition, fineness, setting time, autoclave expansion, and others.
Concrete Mixtures and Testing:
Preparation and proportioning guidelines for concrete mixtures used in tests.
Specific mixing instructions and testing methods for freshly mixed concrete.
Tests on Hardened Concrete:
Specifies the number and types of specimens for each test condition.
Includes compressive strength and flexural strength tests at designated ages.
Reporting and Manufacturer’s Certification:
Detailed report requirements, including all test results and comparisons.
Manufacturer's certification for liquid processing aids upon request.
ASTM C465 is crucial for ensuring the quality and suitability of processing additions in the manufacture of hydraulic cements, playing a significant role in maintaining the standards of cement used in various construction applications.