STRENGTH OF CEMENT MORTAR AND CONCRETE. 



307 



Table IV. — continued. 



Composition. 



1 cement to J } 

 4 sand 



Age in 



days. 



29 



28 



91 



91 



416 



421 



Compressive 

 stress in lbs. 

 per sq. inch. 



280 

 500 

 750 

 920 

 1120 



225 



440 



685 



895 



1095 



230 



480 



800 



1100 



400 



560 



900 



1150 



260 



720 



1325 



200 



680 



1160 



1605 



Compression 

 •0008 inch. 



0-75 

 2-00 

 400 

 6-00 

 9-50 



0-75 



2-00 

 4-00 

 600 

 8-50 



075 



2-00 

 4-00 

 650 



075 

 200 

 4-00 

 600 



050 

 200 

 4-25 



050 



200 

 4-00 

 6-75 



Coefficient of 



Elasticity in 



lbs. per sq. inch. 



Breaking 

 load lbs. 

 per sq. in. 



2906600 

 2190000 

 1720000 

 1430000 

 1113600 



1356 



2140000 

 1890000 

 1557400 

 1388300 

 1215300 



1468 



2240000 

 2090000 

 1845000 

 1597000 



1841 



4506600 

 2490000 

 2095000 

 1813000 



1692 



3960000 

 3290000 

 2971000 



2096 



2760000 

 3090000 

 2745000 

 2286000 



2333 



Table V.— TRANSVERSE TESTS OF MORTAR BEAMS, 4 inches by 

 4 inches, containing 1 cement to 3 sand and 3 bars of iinch steel. 



Age 

 in 



days. 



Load in 

 pounds. 



Readings of Sectors. 



Deflec- 

 tions per 



•01 ton 



Mean 



0-1 mm. 



Total 

 deflection 

 O'l mm. 



Modulus of 



Elasticity 



pounds per 



square inch, 



Breaking 



Load, 

 pounds. 



Modulus 

 of rupture 



pounds 



per square 



inch. 



Front 

 2 mm- 



Diff. 

 0"2mm 



Back i Diff. 

 0'2 mm. 0'2mm 



159 



22 



12-85 



o-oo 



3500 



o-oo 



o-oo 







2890 



2737 





45 



12-85 



000 



3500 



o-oo 



o-oo 













89 



12-85 



o-oo 



35-00 



o-oo 



000 













134 



12-65 



0-20 



35-05 



0-05 



025 



025 











179 



1255 



0-10 



3511 



0-06 



0-16 



0-41 











224 



12-45 



o-io 



35-22 



o-ii 



021 



0-62 



4461600 









269 



12-25 



020 



3538 



016 



036 



098 











314 



12-15 



o-io 



35-82 



0-44 



0-54 



1-52 











358 



12-15 



o-oo 



3592 



o-io 



o-io 



1-62 











403 



12-15 



000 



3593 



o-oi 



o-oi 



1-63 











448 



12-15 



o-oo 



36 06 



013 



0-13 



1-76 











538 



12-15 



o-oo 



3610 004 



004 



1-80 











627 



1215 



0-00 36-32 



0-22 



0-22 



2 02 









1 



717 



1215 



0-00 



| 36-53 



0-21 



0-21 



223 









