Show Weather Causes Roads to Writhe and Crack Under Stresses of Temperature Weather docs does strange thing th to Illinois roads road so 0 the th division lon lon or of highways is 1 I making makinI experiments In counteracting damage damas done don by In temperature l according to R It R Benedict assistant state highway engineer r will A change chance or of o twenty degrees degree cause a road to warp out or of o Its original t position or to writhe for miles like a snake anake until It cracks he h said A A hard road will wilt change Its Ila position almost momentarily In a Iud sudden den change chance of or temperature Benedict said ald Heat from the th sun aun has more to t do with damage damacto to roads caused by weather than any other thing thine A hot midday rise road to sun un causes cause a hard In the th center conter c like a loaf or of bread baking In an oven It If a cold shower bower rails falls all on the concrete It tails falls fall or shrinks brinks In the th middle PUT Pur CHACK I IN That one on thing gate gan tv us more trouble than anything else els We found that this rising and end raIling failing or of the tho th center ot or the th road caused cau edthe the Irregular crack cracks running down the center We e have hav since been able ahle to counteract that damage by putting pulling In a crack running down the th center ot or the th road That takes take ca care car re of ot the rbi and fall tall without doing doln any damage damar to the pavement Heat Heat also causes cau e a road to expand longitudinally A slab lb ot or concrete will slip Bill for or miles In Jn A roadbed until the he th expansion caused b by the tho th heat beat has been bc n let letout letout letout out A hard road will even climb over a hill hili This Is 11 taken laken care caro or of by expansion joints put In at bridges A space or of o at least t t o two vo Inches Is left between th the brideI bridge and tho th pavement so o that the tho elongation of ot the road will be betaken betaken taken care car of or This space pac Is fill CIll filled ed cd with a soft macadam the elasticity or of o which permits the road to expand and at the same Bame time keeps the dirt out of or the tho th joint HOST I OILED ROADS nO Frost causes much damage to oiled roads road When the ground freezes underneath the concrete most moet ot or the th pressure caused by bythe byth the expansion of the th freezing water ater seem to go so Into the ground but In surfaced oil roads road the expansion goes upwards upward and causes cause great creat breaks break In the th sur- sur surface sur surface face face We have hav been making experiments ments for Cor some somo orn time and ana we hope finally to 10 find a 0 way to meet any change In temperature |