The effects of supplementary cementitious materials on alkali-silica reaction.

Details

• Creators:
  Parcells, Jr., William H. ; Montney, Rodney A.
• Corporate Creators:
  Kansas. Dept. of Transportation. Bureau of Research
• Corporate Contributors:
  United States. Federal Highway Administration
• Subject/TRT Terms:
  • Alkali silica reactions
  • Aggregates
  • Fly ash
  • Admixtures
  • Cement
  • Portland cement concrete
  • Evaluation
• Publication/ Report Number:
  FHWA-KS-15-06 ; SPR-73-1
• Resource Type:
  Tech Report
• Geographical Coverage:
  Kansas
• Corporate Publisher:
  Kansas. Dept. of Transportation. Bureau of Research
• Abstract:
  The Kansas Department of Transportation (KDOT) has controlled alkali-silica reaction (ASR) for more than ; 70 years through the use of selected aggregates. Sand and gravel sources had to be tested using Kansas Test Method ; KTMR-23 (1999), Wetting and Drying Test of Sand and Sand-Gravel Aggregate for Concrete. Those aggregate ; sources that did not pass the Wetting and Drying Test had to be used with a “sweetener.” The sweetener had to make ; up a minimum of 30% (by weight) of the aggregate in the concrete. The most common sweeteners used have been ; limestone, calcite cemented sandstone, and a coarse gravel that passed the Wetting and Drying Test. Granite from ; Arkansas has recently been added as a sweetener in the Kansas City market. ; KDOT had traditionally banned Class C fly ash from concrete mixes due to their possible contribution to the ; ASR problem. Class C fly ash that could not meet the expansion requirements for Effectiveness in Controlling Alkali-Silica Reaction in Table 3 of ASTM C618 (2005), Standard Specification for Coal Fly Ash and Raw or Calcined ; Natural Pozzolan for Use in Concrete, was not allowed to be used in concrete mixes for KDOT projects. ; Test sections that utilized selected mixes from this study were placed during the summer of 2008 in Wyandotte ; County, Kansas. The construction report for this project is available, and regularly scheduled surveys are being ; performed (Distlehorst, 2013). ; In 2007, KDOT specifications were changed to allow supplementary cementitious materials (SCMs) in ; portland cement concrete. KDOT began accepting ASTM C1567 (2004), Standard Test Method for Determining the ; Potential Alkali-Silica Reactivity of Combinations of Cementitious Materials and Aggregate (Accelerated Mortar-Bar ; Method), test results for concrete mixes containing SCMs. In 2009, the requirements of Table 3 of ASTM C618 were ; changed from 100% of the control mix to 120% of the control mix for Class C fly ash used in all concrete. ; KDOT is currently evaluating threshold combinations of aggregates and SCMs to determine which ; combinations will require ASTM C1567 testing and which combinations can be approved without testing. This ; research is being conducted at the request of Kansas contractors due to the expense of the ASTM C1567 testing
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/29217/dot_29217_DS1.pdf
• File Type:
  [PDF - 470.95 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:1da9f85f71b93fdcdf43f34dd15f65a68008e93472e0198b293969bcd4f3e328