Document pN2d3GkBZQVyxYLMpXmJLoLE

GP-1401 COMPETITIVE SURVEY READY MIX JOINT CEMENT PRODUCTS Fort Mr* E. B. Hollingsworth Mr* A* J* Petraline Mr* C* W. Lehnwrt* THiscy'- Mr* C* F. Fowler Mr. H. W. Scharf Objective: To evaluata compatitlva raady mix products In ordar to datanslna tha compatitlva position of Gaorgia Pacific raady mix* Summary! Gaorgia Pacific raady mix containing asbastos is aqual to or battar than all othar saaplas tastad in naarly all tasts* Our asbastos - fraa material. however, comparas poorly in all taata axcapt shrlnkaga and bond* It may ba slightly battar in low viscosity body also. COM4ENTS Viscosity Tha largast problem in connaetlon with asbastos - fraa raady mix would seam to ba viscosity control at this tlma* All samples wars poor in this raspact whan compared with an asbestos - containing raady mix* with Gaorgia Pacific matarial being about in tha middle* While Gaorgia Pacific matarial performs as poorly as others, in regards to energy input, and is more sensitive to water additions, the low viscosity workability is marginally better. Freese/Thaw Our product appears to be quite competitive through one freese . thaw cycle, showing better maintenance of bonds than any other and average viscosity change and separation. Bonds Georgia'Pacific ready mix has the beat bond of all samples, showing better bond at both in - pall and machine viscosities, as well as tha only cold bends. We could, however, improve the bofl^sCpnr asbestos - free product somewhat. Cracking Georgia Pacific products have both the best and this area. Asbestos - type material performed very well, while our asbestos free ready mix is in definite need of improvement. Open Time Again, we have both the highest and lowest scores, with our asbestos - free material again in need of Improvement. l/ Water Resistance 11 SGP 0009076 Our asbest... material received top mark while Georgia Pacifld aabeatoa free ready mix was only marginal. Shrinkage Both of our products appear to be adequate, with very good reeults on our aabeatoa - free material. Thia, however, waa to be expected in view of the high amount of cracking of thia sample. Workability As a purely subjective test, 1 feel that our asbestos reedy mix performs very well here, and our asbestos - free is adequate, with the largest problem being a large amount of air entrapment in the asbestos free. Both Cold Bond and Quality had a slightly "sticky" feel which X feel detracted from these products. Applicators also cosesanted that these two products were "gummy". USQ topping also worked quite well. if l t I t i ! i iI , SGP 0009077 GLOSSARY OF TESTING PROCEDURES Viscosity Measurements All measurements were taken on a Brabender Vlsco - Corder set at 79 RPM. "A" viscosity is approximately the highest reading of the sample, taken when the un-mlxed sample was initially applied to the machine, "B" viscosity is the stabilized reading of an un-mixed sample. "C" viscosity is the stabilized reading of a sample which has been mixed very vigorously, simulating the action of an electric drill, "ff* viscosity is the stabilised reading of a sample which has been mixed with 5% water. Freeze / Thaw cycle Samples were conditioned at -1 degree F. for 24 hours and then allowed to thaw at room temperature. Bonds . "A" bonds were at in pail viscosity. "B" bonds were et a machine viscosity of 400 BU. Room bonds were taken at room temperature, while cold bonds were applied, then conditioned at 40 degrees F. for 24 hours before being pulled. All cold bonds were pulled again at room temperature and all samples showed about the same results as when they were pulled while still cold. "A" tests were ac in-pail viscosity, while "B" tests were taken again at a machine viscosity of 400 BU. All tests were taken according to plant testing procedure number 37. Open Time Ready mix was applied to a board .023" thick and observed periodically until it could no longer be worked. The figure given is in minutes from application. Seedy mix was again applied to a board .023" thick and let dry. One drop of water was placed on tha dried sample and allowed to remain for two slmitai, whan tha excess was picked up. A loading of 301 grams was applied over.an area of 20 square ma on the dropof wates and the resulting depression measured in thousandths of an inch. By this method* the higher tha number* tha lower the water resistance. PgnfttT Density figures ere in pounds per gallon. .Yg.ltfit Volume figures are in gallons. Shrinkage values were measured off of the "A" and "B" crack tests* at in pail and 400 BU viscosities. SGP 0009078 All sampling, tasting, and reporting was dona by Dan Hanson at tbs Milford plant* D. D. Harmon i l. il! - r ! ;i ii i : i i :> :! *^ I II ` ; i> j\ iI ii h ii SGP 0009079 ,,V,, PA > N etwtiv m^nMO m* o ** *>(] r n <rt * * 8 f* rr Mniitti iisifi U m*0 M M N uf* */ BI JS tt* woa* 9f)M4S 1*> fePAOTA **1 /MMJ1 -*- ftwm uix * . M k. 53 $ ss r*r>t /1P03ta uVx ? M4 * B. r 2 t --, 9 O rv j 8 i r> N : > M e 8k* r\ h 1 $ s 8. ER 8 O R '1 8 < 53 |A 53 3 # rr * -> r r* % <5 <4 8 8. r- iS r> s' m : * 55 4 r 8 S M n < *4 -- --------1 ' n N* M *4 ^k. k 8* 8* s 8 8 ku kfc l M % r* g 5 55 l* s rv 8 l i g<5 8N *r 9 8 8 O S * 81 & iW 4> *8 ** < <i 6 65 SGP 0009080