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Show C - - -rr h , s '! s . .... - -i , O.MPLETIN'G JOB Thorn Construction's aiinf machine lays a 17-foot wide layer of m and asphalt mix on the old surface of 115 in Utah County. By completion date, 280,000 tons of slag from U. S. Steel's Geneva Gen-eva Works will be used in the project, making mak-ing it the largest slag surfacing job ever undertaken in the intermountain region. freeway widened, re-surfaced -torn Construction Company jits city is widening and retting re-tting a 17-mile stretch of T-Iate Highway 15 in the end of the county with from the steel mill's blast es at U.S. Steel's Gene- slag from the mixer plant at the north end of the mill's slag dump to the nearby expressway, ex-pressway, making the project the largest slag suifacing job ever undertaken in Utah or the Intermountain region. va Works, a product once dismissed dis-missed as a useless steelmaking by-product. The man-made rock is proving prov-ing to be a tough, durable roadbuilding aggregate, which the state has found withstands the weather better than some of the other materials. One unique feature in the current paving, according to E. J. Wilson, district contstruc-tion contstruc-tion engineer, is an experimental, experimen-tal, one-inch "cushion" mixture of slag and an SC-3000 asphalt which will lie just beneath the road's seal coat between American Am-erican Fork and Lehi. Wilson said he hopes the special "cushion" "cush-ion" will serve as a shield to prevent old cracking on the original or-iginal surface from re-emerging on the new serface. Due for completion in October, Oc-tober, the $1.5 million project has involved widening 1-15 from two to three lanes in each direction between Lehi and Provo, plus the surfacing of the entire stretch- By completion com-pletion date, Thorn's fleet of bottom dump trucks will have hauled almost 280,000 tons of |