Influence of crystalline admixture on fresh concrete to develop hydrophobicity

Strength and durability are the main properties that are affected by water ingress and moisture attack in concrete bridges and pavement. Protecting concrete from such attacks is normally done by applying protective treatments on matured concrete. However, on-site moisture at the time of application, concern over the penetration depth, and subsequent traffic actions reduce their performance. To eliminate these effects, there is growing interest to add hydrophobic material during the time of concrete production or even apply them at a very early stage of curing. This research considers the application of 1%, 2% and 8% of crystallizing cementitious hydrophobic mineral in fresh concrete. The results demonstrated considerable reducing consequence of absorption of water, despite high slump and marginal reduction of strength at high percentage of admixture, although neither segregation nor thermal cracking was observed in the matured concrete. The optimum performance was found in mixtures with 2% admixture. Additionally, mixture with 2% aqueous hydrophobic admixture revealed marginal strength gain compared to 2% crystalline cementitious hydrophobic admixture, although water protection appears to be better in cementitious crystalline mixture.

• Supplemental Notes:
  • This paper was sponsored by TRB committee AFN10 Standing Committee on Basic Research and Emerging Technologies Related to Concrete.
• Corporate Authors:

  Transportation Research Board

  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Al-Kheetan, Mazen J
  • Rahman, Mujib M
  • Chamberlain, Denis A
• Conference:
  • Transportation Research Board 96th Annual Meeting
  • Location: Washington DC, United States
  • Date: 2017-1-8 to 2017-1-12
• Date: 2017

Language

• English

Media Info

• Media Type: Digital/other
• Features: Figures; Photos; References; Tables;
• Pagination: 12p
• Monograph Title: TRB 96th Annual Meeting Compendium of Papers

Subject/Index Terms

• TRT Terms: Admixtures; Compressive strength; Concrete; Fresh concrete; Hydrophobic properties
• Uncontrolled Terms: Crystallizing material; Water absorption
• Subject Areas: Bridges and other structures; Highways; Materials; Pavements;

Filing Info

• Accession Number: 01628601
• Record Type: Publication
• Report/Paper Numbers: 17-02487
• Files: TRIS, TRB, ATRI
• Created Date: Mar 7 2017 5:28PM