Show NORTH TEMPLE TEPLE P PAVING VING STUDY IS UNDER W LY y City Engineer to Submit Data on Materials Used in r Work tho material t A special P report on content of ot the tho North Temple street paving was being bing prepared Monday by y city Engineer Harry C C. C Jessen for presentation to the city The report was started after Street Commissioner loner Joseph H. H Lake raised the he question as to whether or not tho the city's cuts type of or pavement should not be ha changed In view lew of the tact fact that fact that tha many re recent ent paving paYing Jobs are arc falling failing to give good service sen Mr fr Jessen n said his review rc of data on the North Temple street project Indicates s that crushing tests conducted conducted con con- ducted at the time the pavement was wa-s laid showed the materials above c aver cr age The tests teAts were made at the thes s state te road commission and the University Uni of or Utah laboratories TO SU SUBMIT UT DATA The engineer will also alro submit data compiled b by the UnU United d Stat States s bureau of roads ds and the tho Am American Society for Testing Materials tat In support or of his assertion that results l obtained from cement pavement arc more or orleM orless orless less leM a gamble The federal data was gathered in connection with a a. paving project of feet near Memphis Term Tenn laid In July Jub 1928 This pavement pa was cured In twenty five e different ways wayS' according to approved cd methods The methods ran ranged cd from the u. u use e of ot various arious patented materials to which Is approved ed locally as the standard method of curing The project Included feet teet ol or on which h no cure at all aU was wasu u used ed Quoting from the thc federal feder 11 data Mr Jessen n said Artificial curing curine was lS omitted al altogether ni- ni together from rota the no cure curci sections and a n special tabulation was as kept oC or orone one section on which no rain fell tell The results developed tho the surprising fact tact that the no cure section ou on which no rain fell CeIl developed less leM cracking than thau the sections cured by The average n length of ot un no cracked slabs was the same as It was for slabs on which the standard cur euro of or pending was used CALCIUM CJ CURE The crushing t tests lists revealed ro that curing with calcium chloride mixture with one exception rated above gO 80 gOper goper per cent of the standard cure A total total to to- tal of or feet was cured under this method The section cured with an asphalt totaling ab about ut feet fee showed the average ratin rating Is about Continued on Pace Pue Twelve NORTH PAVING STUDY TU f fIS' fIS IS' IS UNDE W Continued from Pare Page Sec tl S 65 per cent of the standard pr rc rating and anti the average length cf or tT cracked slabs to be beAbout twenty six About 2600 feet was cured with t Ya cure wih t I pat patented tar product i it I showed crack a rating higher than any othil curing method used metho but the slab was a only 14 14 4 feet g The Tue results feet were ere d dIfferent ii the th pavement laid In the i Jj forenoon i a aM afternoon but cured cure with the sa S ame method meto of spraying the asphalt Greater cracking top with In the sections laid lakE in th the tho Within eight months tS twenty mOr crae had developed in the crac the morning moring and to fourteen en ra lai de i ve in the sections laid In the afternoon Twelve of ot the cra te showed in the first feet of crak SS PAT ment cured In i this thi method methO AbS feet feet was Voas cured in this manner mann Ab cure thi In uIn mane general generl the 30 feet teet cured fe by merely placing moist moLt earth earh ce Ton on top gave gave resl which compare compare 1 tp with the standard method metho DIRECTLY OPPOSED Results sll obtained from the tile standard method of metho curing ot directly opposed to accepted Ve er big Uie thought on this subject eng ct The 2200 feet fet were cured cure in I this thi mann Abt average length lengh of slabs eight months after laying only feet compare compared to t 70 VS fe fe as the tho average a length of slabs slab cured with moist cure wih eath earth Referring to t data of the American Society for Testing Materials J Jessen een said M. M This Thi organization advances s the theory theor that the deposition of or cherni cal crete salts salt rather f In Ln the than pore pare spaces of ot the chem e concrete con con- co concrete cret Ice crystals may be the force producing disruption ma ThI The b accepted theory theor has been bee that Te t the mechanical force forc of or freezing and te thawing has been ben the chief factor contributing to disruption chef Ire tato tive five tre however of whether whether the the trouble Is Es chemical chemical or physical the I agree that water is i the root of the trouble trouble |