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 Dowel Bars Durability Pavement Maintenance Rapid Setting Repair Materials Self-consolidating Concrete Self Compacting Concrete
• 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.
  
  
• Format:
  PDF
• Funding:
  SPR-2789
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:b3a7eac6e30b8dc57f5aa362b894c77e6bd535b1650bb20367e6a1061217c248
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/24787/dot_24787_DS1.pdf
• File Type:
  [PDF - 14.22 MB ]