As noted in Chapter 2, silica fume is an extremely fine material and a sieve analysis will not provide any significant information on particle size or surface area. Silicon dioxide SiO 2 content mandatory. Fly ashes have had this requirement for many years because of the potential for partially combusted coal particles being included in the fly ash.
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The intent here is simply to minimize the amount of moisture that is brought along with the silica fume. This standard does not purport to address all of the safety concerns, if any, associated with its use.
Fly ashes have had this requirement for many years because of the potential for partially combusted coal particles being included in the fly ash. It is not clear whether any coal of this asm nature is present in silica fume, so the LOI requirement is more of a control on any unburned coal or other material from the electric-arc furnace. Talent Strategy Job Campus plan. Read the material safety data sheets for materials used. This requirement is aimed at minimizing the amount of foreign material in the silica fume.
Silica fume shall be stored in such a manner as to permit easy access for the proper inspection and identification of each shipment. Each of the mandatory, optional, and report only items is described below.
ASTM C - 05 Standard Specification for Silica Fume Used in Cementitious Mixtures
It is informational only and not an official part of the standard; the full text of the standard itself must 12240 referred to for its use and application.
These notes and footnotes excluding those in tables shall not be considered as requirements of this standard.
A copy of the cover page is presented astj Figure 4. Test methods for chemical analysis, moisture content and loss on ignition, bulk density, specific surface, air entrainment of mortar, strength acitivity index, reactivity with cement alkalis, and sulfate resistance of silica fume shall conform to this specification.
ASTM C 1240 Standards
Physical tests shall include determining the specimen's density and the specific surface by utilizing the BET, nitrogen adsorption method. Loss on ignition mandatory.
Silicon dioxide SiO 2 content mandatory. This coal can be of a form with a very high surface area, which significantly increases the demand for air entraining admixture in air-entrained concrete.
ASTM C - 15 Standard Specification for Silica Fume Used in Cementitious Mixtures
It is the responsibility of the user of this standard to establish appropriate safety and health practices and sstm the applicability of regulatory limitations prior to use. Historical Version s - view previous versions of standard Translated Version s: Because SiO 2 is the reactive ingredient of silica fume, a limit on the content is deemed appropriate. Such material could include uncombusted materials from the furnace or rust particles from the silica fume collection system.
This abstract is a brief summary of the referenced standard. The material shall composed of silica fume, mostly of amorphous silica. Referenced Documents purchase separately The documents listed below are referenced asmt the sstm standard but are not provided as part of the standard.
As noted in Chapter 2, silica fume is an extremely fine material and a sieve analysis will not f any significant information on particle size or surface area. ASTM does not give any warranty express or implied or make any representation that the contents of this abstract are accurate, complete or up to date.
This specification covers silica fume for use in concrete and other systems containing hydraulic cement. Historical Version s - view previous versions of standard. There is a further requirement that the maximum variation from average be no more than 5 percentage points.
Link to Active This link will always route to the current Active version of the standard. No other units of measurement are included in this standard.