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- -CALIFO.r'.lJil1. I:TS1I'I'L'U'l\q; en 'f!TICl-iJJOLOGY. --

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'l'.he m.a t·~ri al inch:i.ded within thi s r eport i s the

,.. taken during ~1e conetructi on of variou~ buildinge

in the citiee of Pa!!adena- and Los Angele:s over a

p e ri od of e ight month~ ..

The object of the problem ie to determine the

effect o:f.' the water ratio on the 1).lti:mate l!Str ength ..

of the concrete a!! obtained from da:t a obeerve:d nnd

recorded from epec imen~ taken from actual buildi.ng

practice rather than that from l aboratory epecimen;e

:made under ideal ,or at l east more nearl y etandard

conditi on!> ..

The conclu eione .are dra\~ in a tabular form on

-~ page 10.

I t wa13 aleo o1)ee rved that about eight out of ev ery

te~1 contrac t ori!! fn·e u 8ing a dd_r;-iixture s to the ext.~nt

of about th:r.13e per ce nt 1)y weight of the cem~nt used ..

The ~trength of epecimene teeted a t ee1ren day15

were evaluate d for aomparati-ve !>Ur:po ee l!!I to their

probe.ble is tre ng th at twei.1tyeigh t cJ.ay~ by Abrams

diagram formula:

St!!ength(~8 daye ) i s equal to Strength (7 day~ ) plu !el 30 ti-.:o.e ~ ~quare root of Strengt h ( 7 days ) •

.All :i!peciment! ta.ken are for a nominal mix of

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