Development of a glass polymer composite sewer pipe from waste glass. Progress report No. 8, April--June 1978

The first test results on durability of glass polymer composite pipe in flowing water at 65/sup 0/C are available: after exposure for 836 hr, this pipe shows no reduction in strength. The test data from vitrified clay pipe show a great deal of scatter and no apparent trend. Asbestos cement pipe has exhibited strength regression with time, the loss being 25% after exposure for 1512 hr. Testing in 5% H/sub 2/SO/sub 4/ is in progress, but data are available only for asbestos cement pipe. The rate of deterioration is greater than in hot water, the reduction being 35.5% after 1009 hr. Experiments to optimize the GPC mix formulation are continuing. A resin concentration of 9 wt % produces specimens with adequate strength, but difficulty in meeting the hydrostatic test requirement has been encountered. Recent work indicates that this can be corrected by use of a resin concentration of approx. 10.2 wt % in conjunction with improved vibration during placement.