Dowel Bar Retrofit Mix Design and Specification

Details

• Alternative Title:
  JTRP Technical Reports Joint Transportation Research Program
• Creators:
  Deshpande, Yogini ; Olek, Jan
• Corporate Creators:
  Purdue University. Joint Transportation Research Program
• Corporate Contributors:
  Indiana Department of Transportation ; United States. Federal Highway Administration
• Subject/TRT Terms:
  • Dowel bar retrofit
  • Pavement maintenance
  • Self compacting concrete
  • Durability
  • Dowel bars
  • Rapid setting repair materials
  • Self-consolidating concrete
  • Durability
• Publication/ Report Number:
  FHWA/IN/JTRP-2012/15
• Resource Type:
  Tech Report
• Geographical Coverage:
  Indiana
• Edition:
  Final report.
• Corporate Publisher:
  Purdue University. Joint Transportation Research Program
• Abstract:
  The focus of this project was on identifying critical properties that control long‐term performance of repair concrete, especially rapidsetting ; materials extended using pea gravel (maximum size aggregate 9.5 mm). ; In the first phase of this project, four commercial rapid‐setting materials (CRSMs) were selected and development of mixture ; proportions in terms of optimum pea gravel content and water content was performed. Optimized mixtures were further evaluated at ; three different initial temperature conditions. The properties evaluated included workability, setting time, rate of compressive strength ; developed, slant shear bond strength, freeze‐thaw resistance, air‐void system characteristics of hardened concrete, drying shrinkage and ; cracking potential. It was observed that some of the CRSMs evaluated did not meet requirements of ASTM C 928. All, except one, ; CRSMs tested exhibited low resistance to freezing and thawing but all had high resistance to cracking. ; In the second phase of the project, rapid‐setting self‐consolidating concrete (RSSCC) was developed using ternary blend of cementitious ; materials, high‐range water reducer (HRWR) and accelerators. Slump flow, visual stability index (VSI), compressive strength at various ; ages and the power consumption values for the mortar mixer indicated that a five minutes mixing sequence involving a 2‐Step addition ; of HRWR produces stable RSSCC mixture. The results of various tests carried out indicate that it is possible to develop a small aggregate ; size‐based self‐consolidating repair concrete that achieves a compressive strength of 19 MPa at the end of 6 hrs, has good bond ; characteristics and excellent freezing and thawing durability (DF>90%). ; The sensitivity of RSSCC to aggregate characteristics and production variables was also evaluated. Specifically, the influence of ; aggregate gradation and aggregate moisture content using different types of mixers and re‐mixing after a period of rest was evaluated. ; It was observed that variation in aggregate moisture content and aggregate gradation resulted in noticeable changes in fresh concrete ; properties such as the slump flow, stability and V‐funnel flow values. While changes in moisture content and gradation of aggregates ; had an impact on the early (6 h) compressive strength, the compressive strength at the end of 24 hours was not significantly affected.
  More +
• Format:
  PDF
• Funding:
  SPR-2789
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24787/dot_24787_DS1.pdf
• File Type:
  [PDF - 14.22 MB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:b3a7eac6e30b8dc57f5aa362b894c77e6bd535b1650bb20367e6a1061217c248