May 8, 1916 



Tests of Reinforced-Concrete Slabs 



215 



and allowed to remain on for two days, giving curves 2 and 3. The load 

 was then removed, and curve 4 shows the amount of set about two hours 

 later. This set is somewhat reduced after a few days' rest. The values 

 of the effective widths shown in this figure differ very largely and are 

 also indicative of the fact that the time factor is very important. 



Fig. 6. — Concrete defonnation curves for slab 930. 



Figure 9. — Concrete deformations under 2-point loadings are shown 

 for two-load values. The 40,000-pound load was applied immediately 

 after taking the zero reading, and the deformations taken at once. The 

 load was then increased to the 80,000-pound value and deformations 

 again taken. The whole operation required not over two hours. The 

 local effect at the load points is very pronounced for the larger load. 



