STRENGTH OF MATERIALS 



The compressive strength here ranged from 5000 lh./in. 2 to 1S.OOO 

 11). /in. 2 . Average values for the strength of different kiiuls of hri.-k 

 in compression mi^ht IK* jiven as fnll\v<: soft brick. ( .H)n lh. 

 hard brick, 3250 lb./in. 2 ; and vitrified brick, 17,500 lb./in.-. The 

 latter includes uiving brick. 



Problem 184. The following bricks were tested in compression. 



(a) Red face brick: sectional area. ii>v4."> in.- ; l.i;ul r rk, 370,000 Ib. ; 



I..H.I at m:ixiiiium, 884,600 Ib. 

 (6) Yitrilir.l i.rirk: sectional aiva. i'7.4f, in.*; load at first crack, 72,000 Ib. ; load 



at maximum. -J^i.OOO Ib. 

 (c) I'aviim l.ri.-k : sr.-tiunal an-a. i" load at first crack, 51,000 Ib. ; load 



a,t maximum, 148,000 Ib. 

 Kind the intensity of stress at first crack ami at maximum I.M.I in i-a 



229. Modulus of elasticity of brick. As in the <-ase 

 concrete, the modulus of elasticity <>f hrirk in cinj>ressi..n ; 

 cnnstant, l.ut varies to some extent with the load. On armum <!' 

 this variation it is hard to give average valur* I.T tin- mndul- 

 elasticity <if hrick, especially as the matt-rial- and iwthnds f manu- 

 facture are so varied. Thcrefnn- in >tatin.u' th- nnHluh: 

 it is also necessary to state the correspcnidin*: l>ad. stii.-tly ^JH 

 hrick, stone, and concrete have no modulus of elasti 



The table belw is the result of a series of tests 01 ned and 



mud hrick. tested edgewise in compression, and -:.- th. m.M lulus of 

 elasticity for loads between 1000 lb./in. s and 3000 Ibyin.*, an 

 at the highest stress observed. 



M()Dri.r> Of BLA8TK rrv IO1 r.KlCK 



