AASHTO M295-19 pdf free download
AASHTO M295-19 pdf free download.Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete.
2. REFERENCED DOCUMENTS ; 2.1. ASTM Standards: ■C125, Standard Terminology Relating to Concrete and Concrete Aggregates C311/C311M, Standard Test Methods for Sampling and Testing Fly Ash or Natural Pozzolans for Use in Portland-Cement Concrete 3. TERMINOL .OGY 3.1. Definitions: 3.1.1. The terms used in this specification are defined in ASTM C125. 3.1.2. fly ash- finely divided residue that results from the combustion of ground or powdered coal and that is transported by flue gasses. Note 2- This definition of fly ash does not include, among other things, the residue resulting from: (1) the burning of municipal garbage or any other refuse with coal; (2) the injection of lime directly into the boiler for sulfur removal; or (3) the burning of industrial or municipal garbage in incinerators commonly known as“incinerator ash.’4. CLASSIFICATION 4.1. Class N- Raw or calcined natural pozzolans that comply with the applicable requirements for the class as given herein, such as some diatomaceous earths; opaline cherts and shales; tuffs and volcanic ashes or pumicites, calcined or uncalcined; and various materials requiring calcination to induce satisfactory properties, such as some clays and shales. 4.2. Class F- Fly ash that meets the applicable requirements for this class as given herein. This class fly ash has pozzolanic properties. 4.3. Class C- Fly ash that meets the applicable requirements for this class as given herein. This class of fly ash, in addition to having pozzolanic properties, also has some cementitious properties. Note 3- Class F fly ash is typically produced from burning anthracite or bituminous coal but may also be produced from sub-bituminous coal and from lignite. Class C fly ash is typically produced from burning lignite or sub-bituminous coal and may also be produced by anthracite or bituminous coal. 5. ORDERING INFORMATION 5.1. The purchaser shall specify any supplementary optional chemical and physical requirements. 5.2. The purchaser shall indicate which procedure, A or B, shall be used when specifying requirements for effectiveness in contribution to sulfate resistance under Table 4. 6. CHEMICAL COMPOSITION 6.1. Fly ash and natural pozzolans shall conform to the requirements as to chemical composition prescribed in Table 1.Note 4 -The chemical component determinations and the limits placed on each do not predict the performance of the fly ash or natural pozzolan with hydraulic cement in concrete but collectively help describe composition and uniformity of the material. 7. PHYSICAL PROPERTIES 7.1. Fly ash and natural pozzolans shall conform to the physical requirements prescribed in Table 3. Supplementary optional physical requirements are shown in Table 4. 10.2. Packages varying more than 5 percent from the stated mass may be rejected. If the average mass of the packages in any shipment, as shown by determining the mass of 50 packages taken at random, is less than that specified, the entire shipment may be rejected. 10.3. Any coal fly ash and raw or calcined natural pozzolan in storage prior to shipment for a period longer than 180 days after testing may be retested and may be rejected if it fails to meet the fineness requirements. 11. PACKAGING AND PACKAGE MARKING 11.1. When the fly ash or natural pozzolan is delivered in packages, the class, name, and brand of the producer and the mass of the material contained therein shall be plainly marked on each package. Similar information shall be provided in the shipping invoices accompanying the shipment of packaged or bulk material.AASHTO M295-19 pdf download.
