Development of high quality pervious concrete specifications for Maryland conditions.

Details

• Creators:
  Amde. A.M. ; Rogge, S.
• Corporate Creators:
  University of Maryland (College Park, Md.). Department of Civil and Environmental Engineering
• Subject/TRT Terms:
  Admixtures Aggregates (Building Materials) Cellulose Compressive Strength Concrete--Additives--Testing Concrete--Service Life Concrete Aggregates Durability Tests Freeze Thaw Tests Lightweight Concrete--Specifications Porous Concrete Specifications Tensile Strength

  More +
• Publication/ Report Number:
  MD-13-SP009B4F
• Resource Type:
  Tech Report
• Geographical Coverage:
  Maryland
• Edition:
  Final report.
• Corporate Publisher:
  Maryland. State Highway Administration
• Abstract:
  One of the main objectives of this research was to develop preliminary specifications for high quality
  
  pervious concrete suitable for use in Maryland State Highway Administration (SHA) projects. The study
  
  utilized aggregates that are used in SHA projects and the durability studies that were conducted assumed
  
  Maryland weather conditions. Investigations were conducted to enhance the structural and durability
  
  characteristics of pervious concrete through the use of different admixtures. The admixtures included
  
  cellulose fibers, a delayed set modifier and a viscosity modifier. Pervious concrete specimens were tested for
  
  density, void content, compressive strength, split tensile strength, permeability, freeze-thaw durability, and
  
  abrasion resistance. Three different types of freeze-thaw durability tests were conducted to mimic potential
  
  field conditions including the possibility of clogged pavement. The freeze-thaw durability tests included:
  
  fully saturated tests, 50% saturated tests, and 0% saturated dry hard freeze tests.
  
  The study found that of the different admixtures tested, cellulose fibers had the largest impact in
  
  improving durability. Including cellulose fibers in the pervious concrete mix resulted in significant increases
  
  in resistance in all three freeze-thaw durability tests. It also resulted in significant increases in abrasion
  
  resistance. By bridging the gap between the coarse aggregates, the cellulose fibers bound the pervious
  
  concrete mixture with an interwoven matrix of fibers. This also improved the tensile strength of the pervious
  
  concrete. The delayed set modifier resulted in a more fluid mix and in large gains in compressive strength at
  
  seven and fourteen days. This admixture may inhibit some of the cement from setting around aggregates and
  
  may result in some cement settling to the bottom and forming a less pervious layer. The viscosity modifying
  
  admixture created a more workable and easier to mold mix. Its effect on strength and durability were
  
  minimal.
  
  
• Format:
  PDF
• Funding:
  SP009B4F
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:17ea0485500d366e7d52127449da19635a3cd9bb19a5a8a8383b60e0102f80e7264620351f74cb343bac9531f048344dabd94ba3ab7b92712f87d2d00ece7b4c
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/25665/dot_25665_DS1.pdf
• File Type:
  [PDF - 1.87 MB ]