cee60-sp07-mt1-Monteiro-soln

cee60-sp07-mt1-Monteiro-soln - LO 391343'1’ C C H,2...

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Unformatted text preview: LO 391343 '1’ C C H ,2 ? UNIVERSITY OF CALIFORNIA AT BERKELEY DEPARTMENT OF CEE '5 SPRING SEMESTER, 2007 Instructor: R]. M. Monteiro 33 H Name: CE 60 — EXAMINATION Please 'usti all our answers Question 1 (33 points) ‘ 1) Describe the chemical reactions responsible for the formation of calcium hydroxide. (6 / ““9 g é points) CZQQH’): Midlifs + H :Cgsxf—IS +CH+ C $ 414363311913 +O,H 't 2). Describe what happens if there 15 a problem with the temperature con nfrol and the burning temperature is reduced by 300 C? (6 points) 41¢ m M ,6-41. M id" For extra credit: What 15 the temperature of the rotary kiln (approximate value will be Wfi/a’ fine) used 1n the production of portland cement? (3 points) a gwoc 3) What are the major differences between 1n the chemical com position tween AST>< M- / Types III and V portland cement? (6 pointsWJIC 9M a 4) In. a cement paste, after a given degree of Zydrzfi‘i‘r’1’ri41’gsfig”?O observed that the amount of cement is reduced to 50% and the amount of water to 75% of their original values. «(xi Compute the original water to cement ratio (15 points) M Q {99. 22% Wm 21;,” ‘m’x >< Ln i 3 I517 M wvw g :7 VP=1¢90 / ((90 \/ :57D VC, 0 / '1}; I { 5M WMW W wevw , 799’” v 43.; five/’7 lWVfiW ' q 57L, ‘ 6 6‘ ”/9/4743, Question 2 (29 points) 1) Does concrete gain strength by drying of the excess water in the cement paste? (7 points) 2) Briefly describe why the transition zone is the “weak link” in concrete. (7 points) 3) In the laboratory the following strain measurements were taken for a cylindrical concrete specimen tested under uniaxial compression stress of 1500 psi: Longitudinal Strain: 500 10“" Lateral Strain -100 10‘6 (6 points). Compute Poisson’s ratio and the Elastic Modulus of the concrete. (8 points) 4) For normal strength concrete, Why does the strength of a good aggregate does not influence the strength of the concrete while the elastic modulus of the aggregate influences the elastic modulus of concrete? (7 points) Question.3:(41 points) . \ gym-w [X 1) Which component of the cement paste is responsible for the creep of concrete? Write the hydration reactions that originate this hydration product (7 points)” 5 {2 H2 +CH 75M 59H 5317M 5 9% WV ’ my MWLBMJEHQ . .. 5:5 +H77c3§2175 {Ia-«Hm M 11) Based on the following information of the éix proportions, compute the water content knowing: Amount 1250 1b/yd3 Fine aggregate Coarse aggregate 1650 lb/ cl3 w/c 0.45 air content 7.0% Characteristics of the materials: Bulk density of the cement: _197 lb/ft3, Bulk density of the fine aggregate. 162 lb/fi3, Bulk density of the coarse aggregate: 175 1b/ft3, dry-rodded \li/ unit weight: 115 lb/ftj, fineness modulus 2. 9, maximum size aggregate lin. (20 points) ‘Write your answer here: 2. ft 74f5% H22 fl. ,3 34.9% W 1 111) List four parameters that affect the elastic modulus of concrete. Explain your answer C((6p0ints) fiém WMM WW. IV) For a given le design (based on saturated surface-dry aggregate), compute the job batch weights: (8 points) Design Weight (SSD) Moisture Job. Batch Weight pcy % lbs lbs cement 438 - #33 ’7 M water 287 - gaff/63 ~—'> HWO sand 1315 +4 (”’69 1347.6 ’7 M- gravel 2123 /—1—L21.a$) 7m, 1 . ,7 3 “9 ram ' \‘\~~ _\ LNG ‘,__ ~ _,3 &\ _ . , _, f:‘:f_7fi‘.,‘j,‘f~~7 flfly/ l) m We 4,2; .7 ? / ;;fli>~e/ lid/62%;? ' I 3:4? ’4’ q ’ 4199,. L 7.;— {ea} 7 a. 9%?” 91’ ' a) M 7 my” a; $43 / ._, a . / W¥?757C + are Mfly‘lrrfi' m z 2 y 3 we ' \Ia 0M, 0'6? 27 7 r.r€} :7 Lads") : 3‘ , 4% 5" Mb ”(4.03 #9 C l ‘2‘...“ A, ##__._-_ ,_ mm...“ a.» "6,1; 2-4???4/965 E) HWQM ymmWW/EW 9mm %d,r?qgflzz./C 144%) EM MW ' a fdgmm,’ Emfim MW) // ...
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