Aberthaw tests of concrete in sea water . depth of 8 feet therewas also placed a steel pipe ^yiinches in outside diameter. Thiswas used simply to core a hole,and was removed, after thespecimens were set, in the follow-ing manner: Before placing, itwas covered on the outside withparaffin, and when the concretehad set, live steam was turned Showing reinforcement, and method ot supporting pipe for cored hole. i^f/^ fliii •;£> -nrliir.!! -iiro a tlTcvTi The twisted square, running the full length of pier in two opposite miO LllC pipC, VVinLll VVclh UJeilcorners, was used for some lime
Aberthaw tests of concrete in sea water . depth of 8 feet therewas also placed a steel pipe ^yiinches in outside diameter. Thiswas used simply to core a hole,and was removed, after thespecimens were set, in the follow-ing manner: Before placing, itwas covered on the outside withparaffin, and when the concretehad set, live steam was turned Showing reinforcement, and method ot supporting pipe for cored hole. i^f/^ fliii •;£> -nrliir.!! -iiro a tlTcvTi The twisted square, running the full length of pier in two opposite miO LllC pipC, VVinLll VVclh UJeilcorners, was used for some lime as a means of support for the pier. See view and caption on page 4 ^^^JJ^ .^^^^ quickly rCmOVCd. At the extreme top of each specimen was embedded a 3-inch pipe, which wasthreaded and capped. The object in coring this hole was to ascertain whetherwater percolated into the specimens from the sea. The sand and stone were measured in accurately made frames and werethen completely fed into the mixer first; next the cement was shoveled in,. [6] ACTION O F SEA WATER O N CONCRETE the process requiring about one minute; and after half a minute the waterwas added with pails, being accurately weighed out, this occupying about oneminute. In every case, in as near two minutes as possible after the first waterwas added, the batch was dumped from the mixer. It required from 15to 18 minutes entirely to place a batch in the forms, where it was thoroughlyspaded and tamped. The workmanship was intended to reproduce as nearlyas possible the conditions of actual practice. The specimens remained inthe building for about five weeksbefore being hung from the caplog, as shown in the photograph. In 1909 the core holes left by the withdrawal of the 2>^-inch steel pipe were sounded for water. All were dry except seven, which contained water as follows: No. 1 38 inches No. 2 65 inches No. 4 60 inches No. 5 52 inches No. 7 16 inches No. 8 22 inches No. 15 27 inches From time to time examina-tions hav
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectconcret, bookyear1920
