. Journal . es in weeks years. weeks. years. 4 2 3 4 1 2 3 337 470 528 175 185 360 300 Other Briquettes taken out of atmosphere at statedperiods, kept in solution, and then broken asfollows:— 3 to 1. 6 to 1. Weeks in malt-kiln Years in solution. Tears in solution. phere. 1 2 i 3 1 2 S 4 weeks8 „12 „52 „ 640 487565900720 505660 575 120147 150 150 I can carry these tests on to much lonecr dates, inparticular those in the salt water box in the river, butit appears to me that they have gone on long enough toprove without that tho addition of the calcinedclay is a most valuable safec\iard a
. Journal . es in weeks years. weeks. years. 4 2 3 4 1 2 3 337 470 528 175 185 360 300 Other Briquettes taken out of atmosphere at statedperiods, kept in solution, and then broken asfollows:— 3 to 1. 6 to 1. Weeks in malt-kiln Years in solution. Tears in solution. phere. 1 2 i 3 1 2 S 4 weeks8 „12 „52 „ 640 487565900720 505660 575 120147 150 150 I can carry these tests on to much lonecr dates, inparticular those in the salt water box in the river, butit appears to me that they have gone on long enough toprove without that tho addition of the calcinedclay is a most valuable safec\iard against the action ofsea water in concrete, tho long date sand tests all beingso high and the 5 to 1 porous briquettes all standingso well both in salt water and in strong solution. 10 EWAN—THE ESTIMATION OF SULPHIDE IN ALKALI CYANIDE. (Jan. IG. lf>0». Diagram No. 10Comparative Tensile Text. Red and Portland in Salt and Fresh Water. Salt Tist8 Fresh Tests Red Cement. Nbat Tests. Portland ASC ( s la WEEKS I a » 4 Krd Cement. Portland Cement 600 600 500 / ^ soo «0C ^ / .^^ — —. —? too _ ... ^__ --• 300 »? * 300 ? y ^ 300 j< ^ 200 -H / 100 ^ P- lOO ^ Nil, NIL e i: IVEEKS 5 6-7YEARS ACE / * 8 12* ( WEEKS 5 6VCANS Portland cement to need a lot of carbon dioxideto make it safe. Red can take a little, but can quitewell do witliout it. Over five tliousand tons of red cementhave already been used in various works in both seaand fresh water, and the results have been very mixed with water this concrete is more plasticand sticky than Portland and appears to answer betterfor under water work. As a substitute for lime mortarfor setting bricks it is liked, and the colour of the wallsis pleasini; to the eye. Red cement reduces the cost of concrete work, and ifit is going to lengthen the life of important and costlymarine works, then m,v time and tliat of my statf whichhas been devoted to this subject, will not have beenwasted. It
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
