O SPECIMEN NO. 236. 1:2:4 VERY WET MIX, 



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large Circles denote where specimens were immersed in water. 



p IG . 6. Expansion and contraction of 1:2:4 and 1:3:6 concrete alternately wet and dry. 



80045° — 17 — Bull. 532. (To face page 6.) No. 2. 



