Test_4_solution - Michigan State University Department of...

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Unformatted text preview: Michigan State University Department of Civil and Environmental Engineering CE 337 - Civil Engineering Materials (4 credits) Fall 2007 Test 4 11/9/07 l \ 7 Name: PID# : No’re : Time allowed is 50 minutes Maximum points possible 20. You are allowed to bring one 3” by 5” index card as a “cheat” sheet. All equations and intermediate steps leading the final answer must be clearly shown. Indicate appropriate unit where applicable. 50% points will be deducted for a given answer if the units are incorrect or missing. > There will be NO partial credit given for any question. CE 337-Test 4 l Fall’07 Question l-Multiple choice, True and False and fill in the blanks. (Each correct response is worth 1/4 point-Maximum points possible = 4. 75). A no response will also be considered as an incorrect answer. 1. If the 28-compressive strength of a PCC cylinder is 3500 psi, estimate the split tensile strength of the concrete? a) 3500 psi b) 444 si 0.7g: 6 d) 350 psi e) cannot be determined 2. A concrete cylinder 6” in diameter and 12” in length is tested in the IDT mode. The load at failure was recorded as 40,000 pounds. The indirect tensile strength of the concrete to the nearest whole number is: am 34951 UL? = 2%4O,cs\m c) 363 psi 7C-x—é 4613» d) 398 psi e) cannot be determined 3. If a PCC mixture design requires 611 pounds of cement then the cement factor for this design is a) 5.5 b) 611 d) 7.5 e) cannot be determined 4. The volumetric composition of a PCC mixture includes 2.5 ft3 of cement, 4 ft3 of water, 12 ft3 of coarse aggregate, 7.5 ft3 of fine aggregate and 1ft3 of air. The mortar factor (MF) for this mixture is: a) 0.50 M17: 9.9-1.1 30"?)(0 b) 1.00 (SF—3% ,0” e) 0.44 5. As the coarse aggregate size increases the a) Coarse aggregate factoECREASES for a given fineness modulus of sand. b) Amount of design air entrainment INCREASESASECREASES fix a given exposure level. CE 337-Test 4 2 Fall’07 6. The center point flexural strength of a concrete mixture is 500 psi. The estimated third point flexural strength of the same concrete is: a 460 si m c) 500 psi d) Cannot be determined based on the information provided. 7. In a Bingham fluid, flow can only initiate after the ITS stress has been overcome by external stimulus. 8. The maximum compressive load carried by a cylinder (6” by 12”) cured for 28-days is 130000 pounds. The compressive strength nd elastic modulus of the concrete is W and 5 '&®* 10 F51, respectively. (Appropriate units need to be sh n). 9. As part of concrete mixture design requirement the design engineer specifies a concrete compressive strength of 3000 psi. The standard deviation based on 15 strength samples is 300 psi. The required average compressive strength for this PCC mixture design is 3 4 ea 32 Ea . 10. The unit weight f normal concrete ranges between " l SD lbs/ft3. 11. The stress-strain curve for concrete is non-linear because Al (2. y'glg _S . 12. Water reducing admixtures are added to concrete for Wacandpw . 13. The three design criteria for entraining air in co rete necessary for effective freeze- thaw resistance include ’ AIR. , EELE and spAcaHQ . CE 337-Test 4 3 Fall’07 Question 2 (6 points) Use the data given below to answer the questions. Show all equations and calculations to receive full credit. Table 1 — The FCC mixture design (dry weights to produce 1 cubic yard of concrete) is as follows: Table 2 1 D Weihts lbs Water Cement Coarse Aggregate Fine Aggregate Air (%) ész #492496 VAH’L =y "*olq :. 0.8(46 {0° F’msAcg ‘: Q?! {Q} CE 337-Test 4 4 Fall’07 b) Determine the adjusted weight of the design water (based on stock weights) in pounds? For this part assume that the dry weight of the coarse aggregate is 2000 lbs and the dry weight of the fine aggregate is 1500 lbs, irrespective of what you computed in parts (a) and (b). (3 points) CbARSE, ¥Imé NOD :oqooo Lbs I c) If 10% of the cement as recorded in Table 2 is replaced with fly ash (by weight) then compute the resulting weight of the fine aggregate (oven-dry weight). (Assume specific gravity of fly ash is 2.5). For this part assume that the weight of the dry coarse aggregate is 2000 lbs, irrespective of what you computed in part (a). L_is_t the effects of this fly ash addition on the fresh and hardened properties of concrete (cost savings will NOT count as a response). (4 points) wceMelfl “ 0‘9+S(C> :4ng (Nng = 04*le : S‘\"'°-‘ \/ = gees $9 Ems V = 4 2 gal 813 agar/(EMS Mania é.€'3'*é-Z'+'¥c>2'éc VFL. = S‘ i j Goa-wed: {033 u; H084 5 VGA = 4:2 -IM?9—<NES (“Ganesha-v denim «lo newt) -lHPO—ovLSS LONG It“? 51‘me a- EWQD Pamexcrj VA”; 08'4‘3/ Veep: 4'73 CE 337-Test 4 Fall’07 Question 3 (6 points) Draw typical sketches for the relationships or behavior‘ listed below: a) Compressive strength versus L/d ratio. b) Tension-compression curve for the IDT. c) Bingham behavior of concrete. d) Stress-strain curve for concrete under compression. All sketches should be appropriately labeled and titled. co) CE 337-Test 4 Fall’07 ...
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Test_4_solution - Michigan State University Department of...

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