A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Deterioration of Asbestos Cement Sheet Material in the Marine Environment
Tests were conducted to determine the performance of asbestos cement used in bulkhead/retaining structures along the coastline of North Carolina. It was determined that the asbestos cement bulkhead under investigation was severely deteriorated through the reaction of aggressive CO2 with CaCO3 in the materials. The Ca(HCO2)2 which was formed was leached out of the structure in solution, thus causing a decrease in material density and increase in porosity. Asbestos cement bulkheads are vulnerable to carbonic acid attack in canals and estuaries where biological decay produces an excess of dissolved CO2 and the water's pH is less than 7. Autoclaved asbestos cement as opposed to normal cured asbestos cement may be helpful in delaying extensive deterioration due to carbonic acid. It contains a high amount of silica which is non-reactive at normal temperatures. Autoclaved asbestos cement is subject to corrosion in sea water. The cause of this corrosion is debatable, but it is likely that the presence of a sulphate concentration along with the wetting/drying process invoked by tidal action plays a major role in the mechanisms of deterioration.
Deterioration of Asbestos Cement Sheet Material in the Marine Environment
Tests were conducted to determine the performance of asbestos cement used in bulkhead/retaining structures along the coastline of North Carolina. It was determined that the asbestos cement bulkhead under investigation was severely deteriorated through the reaction of aggressive CO2 with CaCO3 in the materials. The Ca(HCO2)2 which was formed was leached out of the structure in solution, thus causing a decrease in material density and increase in porosity. Asbestos cement bulkheads are vulnerable to carbonic acid attack in canals and estuaries where biological decay produces an excess of dissolved CO2 and the water's pH is less than 7. Autoclaved asbestos cement as opposed to normal cured asbestos cement may be helpful in delaying extensive deterioration due to carbonic acid. It contains a high amount of silica which is non-reactive at normal temperatures. Autoclaved asbestos cement is subject to corrosion in sea water. The cause of this corrosion is debatable, but it is likely that the presence of a sulphate concentration along with the wetting/drying process invoked by tidal action plays a major role in the mechanisms of deterioration.
Deterioration of Asbestos Cement Sheet Material in the Marine Environment
L. Watson (author) / J. Machemehl (author) / B. Barnes (author)
1979
22 pages
Report
No indication
English
Construction Equipment, Materials, & Supplies , Chemistry , Materials Degradation & Fouling , Asbestos cement products , Deterioration , Marine environments , Corrosion , Sea water , North Carolina , Cements , Bulkheads , pH , Laboratory equipment , Samples , Crystal structure , Reprints , Sea Grant program
Properties of Asbestos-Free Cement Sheet with Carbon Fiber
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| Engineering Index Backfile | 1939