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I-IIGHWA Y DEPARTMENT TESTS (Continued f)'om Page 1) "-~-~ ---~ "CL.5 e' \8 '6= LIME STONE- = '" Co>'- // CL.5 r:::::::Jc::::::;J/ / // c;.~ // ' I e; IZ' 8\~ 5 ' , CL. " LIMESTONE '\ CL.o CL.3 ~~5o' -i~5D-i~5D \g -i~:' -i~5d c~~~~ A profile of granular base test sections in the M.H.D, study, Each of the 4 paired sections is 1000' long and separated by 50' to provide an adequate length for tapers, ~ ular equivalent factors be continued for the present. But, because there has been much discussion -and debate over the- granular equivalent of 100% crushed limestone relative to class 5 and 6 material with less than 100% crushing, it was proposed that test sections be constructed on a state highway to deter~ mi ne an appropriate G .E. factor for 100% crushed lime- stone meeting the gradation requirement of class 5. The Minnesota Limestone Producers Association, of / which the J. L. Shiely Com- pany is a member, is cooper~ ating with the Minnesota Highway Department in this study. For example, the Asso~ ciation has contributed approximately 5,000 tons of 100% crushed limestone free of charge for construction of the test sections. The Association believes that, when concluded, the study will show 100% crushed limestone to have a higher granular equivalency than the class 5 and 6, granular material. Construction of the test sections began last fall. They are located near Prior Lake on T.H. 14." Second Drier Installed for Heated Aggregates A new aggregate drier unit has been installed and put into operation at Shiely's Distribution Yard "C". It is the second drier for. the company. The first was installed three years ago in Yard HA" in St. Paul. The new drier supplies heated aggregate to Ready Mixed Concrete Company. It enables contractors to order concrete at temperatures desirable for cold weather construction. Other customers who benefit from heated aggregates are roofing contractors who buy Shiely's roofing gravel. During winter, these contractors formerly experienced problems of moisture-laden and frozen gravel. Now, their heated gravel contains less than one-half of one percent moisture. This pro- vides better bond between gravel and asphalt when construct- ing flat deck roofs. Another pleased customer is Twin City Concrete Products, the local distributor of Sakrete. All Sakrete products are packaged aud thus must be dry. Shiely's heated sand helps the customer maintain a full production schedule for Sakrete at a critical time of the year. . Like its' predecessor, the new aggregate drier is equipped WIth the latest, fully approved air pollution abatement devices to protect the environment from dust. Little or none escapes from the unit. Shiely Solves Slippery Problem for Realtor How do you keep apart~ ment premises safely ice~free during these notorious Minne- sota winters ~- without ruin- ing walks and killing plantlife with large doses of salt? That's the problem that was posed to Shiely this past fan by the Property Manage- ment Dept. of the Eherhardt Company, a major Twin Cities realty firm. Eberhardt operates a large number of apartment complexe-s. Their managers, responsible for keeping walkways free of ice, had used a 100% mixture of salt. It did the job well, hut proved injurious to concrete walks and often killed adjoin- ing grass and shrubs. - Also, Eberhardt requested, how about a bit more traction? Shiely accepted the chal- lenge. And succeeded. The solution: sand for traction, mixed with a small percen. tage of salt. Further, the sand was dried in order to keep the salt in crystal forin. After thorough mixing in a concrete ready-mix truck, the sand-salt combination was hagged in handy 25 lb. plastic sacks and d-elivered to Eber- hardt's apartment properties. It has turned out to be not only a practical but also an economical solutionl to a slippery prohlem. Aggregate Seminar Slated for late February For the seventh consecu- tive .year,_ Shiely will -hold a seminar for area -architects and engineers. Spqnsored annually by the sales depart- ment, this year's sessibnswill take place Fehruary .23rd at the Minnesota Club, down- town Sl. .Paul. Last year's meeting at- tracted 80 participants_ from leading architectural and engi- neering firms in the Twin Cities, a figure expected to be topped in 1972. Among ten- tatively scheduled subjects are the Minnesota Highway Test Section (described else- where in this issue of Corner- stoneL the influence of aggre. gates o~ flexural strengths of concrete, stone base job suc- cesses during 1971, soils and their influence in design, "pop out free" stone con~ crete and a discussion by a bituminous contractor and an architect on better specifica- tiou to get the best design at the most economical cost to the client. Norm Henning of Twin City Testing Labora- tories will be a guest speaker. Vice President-Sales Lowery Smith will direct the proceed~ ings, assisted by John Palda. As in the past, the seminar is designed to be highly infor- mative to all attendees. Earlier sessions have featured a wide-ranghig number of topics, including base designs for crushed stone, chemical reactions to aggregates in portland cement, mineral filler applications and soils engineering for pavements. In keeping with its policy to pass along, as well as to know more about aggregates than anyone else in the business, Shiely utilizes tq_e Bt:~inars to acquaint architeCts"~i~"" _~_<>_ neers with the latest informa. tion in th~_ irfdustry d in oxder to help them fulfill their responsibility to write specifi- cations involving the various types of aggregate . " Johnny Witthans observes a new winter boon to Shiely customers: Yard C's aggregate drier.