Class c fly ash, normally produced from the combustion of lignite or sub bituminous. The basic physical properties such as particle size analysis and specific gravity tests were performed on representative samples from the ash pond. Coal fly ash user guideline portland cement concrete. Astm c 618 categorizes coal combustion fly ash into two classes. Astm pulverised astm c61 c618 classn classf classc bs. Optimizing the use of fly ash in concrete portland cement. Astm c618 summary technical bulletin 34 for more information or answers to questions about the use of fly ash in specific applications, contact your nearest boral resources technical sales representative or call 17706840102 revision date.
Loss of ignition loi f fly ash is the amount of the amount of calcium, silica, alumina, and iron content in the ash. Its composition consists mainly of calcium, alumina, and silica with a lower loss on ignition loi than class f fly ash. Natural pozzolan as a partial substitute for cement in concrete. Pdf the wisconsin department of transportation wisdot currently. Comparison of class c versus class f fly ash for concrete. Fly ash and natural pozzolansastm c 618 aashto m 295 class n raw or calcined natural pozzolans including. Phoenix fly ash class f pozzolan salt river materials group srmg class f fly ash meets all chemical and physical requirements of the current astm specification c 618 coal fly ash for use in concrete.
Class c fly ash is typically produced from burning lignite or subbituminous coal, and may also be produced from anthracite or bituminous coal. C61819 standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete. Astm c618 specifies strength activity that is often erroneously. Natural pozzolan was used from saudi arabia pozzolan s1, south africa pozzolan s2, and jordan pozzolan j. Astmc618 standard specification for coal fly ash and raw or calcined. With decreased fly ash supplies, natural pozzolan reserves once overlooked are being considered and they should be similar to class f ash low cao, sum of the oxides 70% examples. It consists mainly of alumina and silica and has a higher loi than class c fly ash. Class c fly ashes typically have total calcium contents, expressed as calcium oxide cao, that are higher than class f fly ashes. This document is available in either paper or pdf format.
Pdf astm c 618 download shajib kumar guha academia. Astm c618aashto m295 testing of landfilled fly ash sample type. Aci 31814 permits the use of fly ash that complies with astm c618. Pdf class f fly ash assessment for use in concrete pavements. Comparisons, applications, and performance larry sutter michigan technological university. Class c fly ash is normally produced from lignite or subbituminous coal. A rational mix design method was developed for concrete with 2080% fly ash replacement for cement. The chief difference between these classes is the amount of calcium, silica, alumina, and iron content in the ash. Trbs national cooperative highway research program nchrp 749. Astm c618 12 standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete. The class f fly ashes are normally generated due to combustion of anthracite or bituminous coal.
American association of state highway transportation officials aashto m 295 american society for testing and materials astm specification c 618 defines the chemical composition of class c and class f fly ash. In order for class f fly ash to be a viable alternative as a supplemental cementitious material, its use must produce mixes that meet current performance standards with respect to strength. Flyash replacement of cement in concrete fly ash concrete. Class f fly ash assessment for use in concrete wisconsin dot. Fly ash is a pozzolan that reacts with available lime in cement providing more cementitious compounds and is a direct replacement for cement build it green with fly ash. It imposes no additional restrictions on the characteristics of fly ash. Astmc618 standard specification for coal fly ash and. The sai index at both 7 days age and 28 days age for class f ashes are. Astm c618 specified two categories of fly ash, class c and class f depending on the type of coal and the resultant chemical analysis. Astm c618 classifies fly ash as class f or class c. This specification divides fly ash into two classes based on its source of origin and composition as described in table 2. This project brief summarizes the wisconsin highway research program project, laboratory study for comparison of class c versus class f fly ash for concrete pavement.
Acknowledgements nchrp report 749 methods for evaluating fly ash for. Methods for evaluating fly ash for use in highway concrete presents suggested changes to coal fly ash specifications and test protocols contained in american association of state highway and transportation officials aashto standard specifications for transportation materials and methods of sampling and testing aashto m 295. Class f fly ash pennsylvania state university mon, 17 apr 2017 23. Astm c618 19 standard specification for coal fly ash and. Astm c618 17a standard specification for coal fly ash and. This phase of testing also included a class f fly ash, whose properties are specified in astm c61800 29. Class c fly ash is designated in astm c 618 and originates from subbituminous and lignite coals. The consolidation characteristics of impounded class f fly.
What is a practical astm c 618 saistrength activity index for. Astm c61817a standard specification for coal fly ash and. This last class of fly ash, in addition to having pozzolanic properties, also has some cementitious properties. Astm c618 standard specification for coal fly ash and raw. Class f fly ash also has a lower calcium content than class c fly ash. Class c fly ashes typically have total calcium contents,expressed as calcium oxide cao, that are higher than class f fly ashes. Astm c61 astm c618 astm c618 fly ash to fly ash to pulverised fuel ash to pulverised fuel ash to pulverised fuel ash to classn class f classc bsen450 bsen450 bs3892 bs3892 bs3892 category s part1 part2 part3 category n concrete concrete concrete concrete grouts 1 loss on.
Astm c618 19 standard specification for coal fly ash and raw or. Astm c61812a standard specification for coal fly ash and. Excerpts from the two classification systems, astm c618 and aashto m295, are given in tables 1 and 2, respectively. Boral resources class f fly ash significantly increases the ability of concrete to. Astm c 618 summary technical bulletin 34 for more information or answers to questions about the use of fly ash in specific applications, contact your nearest boral resources technical sales representative or call 17706840102 revision date. This research evaluated the performance of class f fly ash concrete with. Class f fly ash is pozzolanic, with little or no cementing value alone. Use of fly ash can earn points in the increasingly important leed system of evaluating and rating buildings.
Methods for evaluating fly ash for use in highway concrete. The loi limit in astm c618 is 6% for class f and class c fly ash, however, the specification allows class f fly ashes with up to 12% loi to be approved by the. According to astm c618, the fly ash from the cardinal power plant of aep is classified as a class f ash. Mix proportions and mechanical properties of concrete. The sem images and eds spectrum of astm class f fly ash. Additional chemical requirements are listed in table 2. Dmi fly ash is the only locally produced class f fly ash in california, providing the highest value in leed leadership in energy and environmental design points for sustainable concrete.
Class c fly ash has selfcementing properties as well as pozzolanic properties. Astm c618 12a standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete. Diatomaceous earths opaline cherts and shales tuffs and volcanic ashes or pumicites calcined clays, including metakaolin, and shales class f fly ash with pozzolanic properties class c fly ash with pozzolanic and cementitious properties. Supplementary cementing material, fly ash, type ci csa a300008 class f astm c618 08a, boundary dam power station, estevan, sk. The chemical compositions of the sample have been examined and the fly ash are of astm c618 class f. Astm c618 19, standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete, astm international, west conshohocken, pa, 2019. Standards for fly ash in concrete astm c311 standard test method for sampling and testing fly. Do industry standards have restrictions on fly ash. The most widely used specification for fly ash in north america is astm c618 standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete aashto m 295. Phoenix fly ash class f pozzolan salt river materials group srmg class f fly ash meets all chemical and physical requirements of the current astm specification c 618 coal fly ash.
Comparison of class c versus class f fly ash for concrete pavement author. This specification covers coal fly ash and raw or calcined natural pozzolan for use in concrete where cementitious or pozzolanic action, or both, is desired, or where other properties normally attributed to fly ash or pozzolans may be desired, or where both objectives are to be achieved. Class f fly ash is designated in astm c 618 and originates from anthracite and bituminous coals. Class c fly ash is typically produced from burning ligniteor subbituminous coal, and may also be produced from anthracite orbituminous coal. Astm c618 17a, standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete, astm international, west conshohocken, pa, 2017.
Sip 4 restrictions on type and characteristics of fly ash. Astm c618 17a standard specification for coal fly ash. Calcined clay or shale, diatomaceous earth, volcanic materials such as dacite, rhyolite. The natural pozzolan samples were crushed, ground, and tested. Astm c618 standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete.
Compared with most soils, fly ash has a lower specific gravity that typically ranges. Fly ash, slag, silica fume, and natural pozzolans, chapter 3. Astmc618 standard specification for coal fly ash and raw. Class c ashes are generally derived from subbituminous coals and consist primarily of calcium aluminosulfate glass, as well as.
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