Abstract

The germicidal effectiveness of various additives when blended within a microstructure of a cement based system was studied. The relationship between the chemical and physical characteristics of concrete surfaces and their ability to have an enhanced resistance to algal growth was documented through a novel set of laboratory and field testing. The main potential areas of application for these new cement composite systems involve the lining of canal surfaces where fixed-surface biocides are desirable to control biofouling. Different biocide formulations containing class F fly ash, silica fume, Zn oxide, copper slag, ammonium chloride, sodium bromide, and cetyl-methyl-ammonium bromide were evaluated for the mitigation of algal growth on concrete surfaces. Mortar coupons treated with these formulations were tested under laboratory and field conditions. These new cement composite systems were compared with proprietary products that are commercially available and applied using a latex paint. Laboratory scale screening experiments showed that various concentrations of zinc oxide significantly inhibited algal growth even after nine months. It was observed that 20% zinc oxide in concrete produced optimal algal inhibition compared to other additives. Copper slag, ammonium chloride, sodium bromide, and fly ash, when added singly, also showed algal inhibition capabilities. Addition of zinc oxide and ammonium chloride (10% each) in mortar mix was as effective as expensive proprietary chemicals in reducing algal growth on concrete surfaces under laboratory and field conditions.

Original languageEnglish (US)
Pages (from-to)839-847
Number of pages9
JournalCement and Concrete Composites
Volume30
Issue number9
DOIs
StatePublished - Oct 2008

Fingerprint

Biocides
Disinfectants
Canals
Cements
Zinc Oxide
Ammonium Chloride
Coatings
Zinc oxide
Water
Concretes
Coal Ash
Sodium chloride
Mortar
Fly ash
Slags
Large scale systems
Biofouling
Silica fume
Copper oxides
Latex

Keywords

  • Algae
  • Biocide
  • Concrete
  • Control
  • Mortar

ASJC Scopus subject areas

  • Industrial and Manufacturing Engineering
  • Ceramics and Composites

Cite this

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title = "Cement-based biocide coatings for controlling algal growth in water distribution canals",
abstract = "The germicidal effectiveness of various additives when blended within a microstructure of a cement based system was studied. The relationship between the chemical and physical characteristics of concrete surfaces and their ability to have an enhanced resistance to algal growth was documented through a novel set of laboratory and field testing. The main potential areas of application for these new cement composite systems involve the lining of canal surfaces where fixed-surface biocides are desirable to control biofouling. Different biocide formulations containing class F fly ash, silica fume, Zn oxide, copper slag, ammonium chloride, sodium bromide, and cetyl-methyl-ammonium bromide were evaluated for the mitigation of algal growth on concrete surfaces. Mortar coupons treated with these formulations were tested under laboratory and field conditions. These new cement composite systems were compared with proprietary products that are commercially available and applied using a latex paint. Laboratory scale screening experiments showed that various concentrations of zinc oxide significantly inhibited algal growth even after nine months. It was observed that 20{\%} zinc oxide in concrete produced optimal algal inhibition compared to other additives. Copper slag, ammonium chloride, sodium bromide, and fly ash, when added singly, also showed algal inhibition capabilities. Addition of zinc oxide and ammonium chloride (10{\%} each) in mortar mix was as effective as expensive proprietary chemicals in reducing algal growth on concrete surfaces under laboratory and field conditions.",
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author = "Absar Alum and A. Rashid and Barzin Mobasher and Morteza Abbaszadegan",
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AB - The germicidal effectiveness of various additives when blended within a microstructure of a cement based system was studied. The relationship between the chemical and physical characteristics of concrete surfaces and their ability to have an enhanced resistance to algal growth was documented through a novel set of laboratory and field testing. The main potential areas of application for these new cement composite systems involve the lining of canal surfaces where fixed-surface biocides are desirable to control biofouling. Different biocide formulations containing class F fly ash, silica fume, Zn oxide, copper slag, ammonium chloride, sodium bromide, and cetyl-methyl-ammonium bromide were evaluated for the mitigation of algal growth on concrete surfaces. Mortar coupons treated with these formulations were tested under laboratory and field conditions. These new cement composite systems were compared with proprietary products that are commercially available and applied using a latex paint. Laboratory scale screening experiments showed that various concentrations of zinc oxide significantly inhibited algal growth even after nine months. It was observed that 20% zinc oxide in concrete produced optimal algal inhibition compared to other additives. Copper slag, ammonium chloride, sodium bromide, and fly ash, when added singly, also showed algal inhibition capabilities. Addition of zinc oxide and ammonium chloride (10% each) in mortar mix was as effective as expensive proprietary chemicals in reducing algal growth on concrete surfaces under laboratory and field conditions.

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