First online quiz results.pdf - Review Test Submission Quiz...

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Unformatted text preview: 11/08/2017 Review Test Submission: Quiz 1 Binders, Aggregates, Water and Construction Materials Spring 2017 48352-2017-SPRING-CITY O Assessments Review Test Submission: Quiz 1 Binders, Aggregates, Water and Admixtures for Concrete Production (10 Random Questions) Construction Materials Spring 2017 Review Test Submission: Quiz 1 Binders, Aggregates, Water and Admixtures for Concrete Production [10 Random Questions] User Charbel Abou Chebel Subject Construction Materials Spring 2017 Test Quiz 1 Binders, Aggregates, Water and Admixtures for Concrete Production (10 Random Questions) Started 9/08/17 10:20 AM Submitted 9/08/17 10:20 AM Due Date 11/08/17 11:59 PM Status Completed Attempt 50 out of 100 points Score Time 50 hours, 0 minute Elapsed 01195150" 1 0 out of 10 points Question 50 in Quiz 1 Worksheet A concrete technologist in charge of concrete mix design at a concrete batching plant is faced with the seven scenarios presented below. a] A large supply of concrete is available for placing in formwork on a construction site but work has temporarily ceased due to the commencement of heavy rain in] More time is required than normal practice to finish the surface of placed concrete c} Concrete is to be placed in formwork under cold weather conditions d] Concrete is to be placed in formwork that is tightly spaced with steel reinforcement e] Concrete is to be hauled over a long distance by road f] Concrete is required to have a high early strength but not a high ultimate strength g} Concrete is required to be able to withstand freezing conditions whilst in service Which admixture should be used in the mix design to address each scenario above? Question 2 10 out of 10 points ... 1/6 11/08/2017 Review Test Submission: Quiz 1 Binders, Aggregates, Water and Question 1B4 in Quiz 1 Worksheet A standard concrete mix design that has been specified to achieve a characteristic strength of 40 MPa contains the following proportions of raw materials: GP cement = 400 kgj'n'i3 Water = 200 l-ig/rn3 Fine aggregate = 650 kg/rnll Coarse aggregate = 1150 l-ig/m3 To produce a more durable concrete it is proposed to use a binder that is comprised of 30% supplementary cementitious material [SCM} and 70% Portland cement. The table below shows the types of Portland cement and SCM that may be used in this mix to meet different conditions of concrete supply. Using the terms increase, decrease or no change, indicate for each of the numbered cells what will happen to the workability, setting time, early age strength, ultimate strength and permeability of the concrete when these properties are compared to the behaviour of the concrete mix given above. Briefly explain your reasonls] for reaching each of these conclusions. Cement SCM . _ What will happen? . _ . type type Level of initial Early age Ultimate Permeability workability setting time strength strength at 360 days LH Fly ash A1 A2 A3 A4 A5 SR GGBFS Bl 32 BB B4 BS Question 3 10 out of 10 points Question 7A3 in Quiz 1 Worksheet A standard concrete mix design that is to be produced at a concrete batching plant is prescribed to contain the following four proportions of raw materials: Cement = 400 lig,‘m3 Water = 200 ligi'n‘i3 Fine aggregate = 650 kgfm?’ Coarse aggregate = 1150 ltgf'm3 The table below presents different scenarios where impurities from washout operations may be present in the mixing water, and different cement types and chemical admixtures are required to be used to address different conditions of concrete supply. For each of the numbered cells, indicate the main class of impurities that may be present in the mixing water that need to be considered, and the cement type and chemical admixture that needs to be added to address each application. Briefly explain your reasonls) for reaching each of these conclusions. Impurities in Cement Admixture mixing water type type Application Constructing an offshore steel reinforced A1 A2 A3 concrete member that will require a delay in finishing operations during placing Placing concrete into formwo rk that El 32 BB requires no consoiidation and a very strong binder-to-aggregate bond in the matrix ... 2/6 11/08/2017 Review Test Submission: Quiz 1 Binders, Aggregates, Water and Question 4 0 out of 10 points Question 6D in Quiz 1 Worksheet The table below shows different types of cement and chemical admixtures that are available for use in a concrete mix to meet different conditions of supply at a construction site. Cement type Admixture type GP Ac H E AEA Using the above table, select both the cement and admixture types that will be best suited to meet each of the requirements presented below given a change in water-to- cement ratio and cement content is permitted for each mix to meet these needs. a] Constructing a concrete box culvert for drainage use of water and soil b] Maximising strength of concrete after 180 days age :1 Minimising extent of shrinkage in concrete after 23 days age d] Repairing a concrete member at an ambient temperature of 5"C Briefly explain your reasonls) for reaching each of the above conclusions. Question 5 0 out of 10 points Question 5A in Quiz 1 Worksheet A concrete technologist in charge of concrete mix design at a concrete batching plant is faced with the seven scenarios presented below. a] A large supply of concrete is available for placing in formwork on a construction site but work has temporarily ceased due to the commencement of heavy rain b} More time is required than normal practice to finish the surface of placed concrete c} Concrete is to be placed in formwork under cold weather conditions d] Concrete is to be placed in formwork that is tightly spaced with steel reinforcement e] Concrete is to be hauled over a long distance by road f] Concrete is required to have a high early strength but not a high ultimate strength g} Concrete is required to be able to withstand freezing conditions whilst in service Which admixture should be used in the mix design to address each scenario above? Question 6 10 out of 10 points Question 3 in Quiz 1 Worksheet ... 3/6 11/08/2017 Review Test Submission: Quiz 1 Binders, Aggregates, Water and The table below shows data obtained following an experiment in which a sieve analysis test was carried out on oven-dried samples of aggregates A, B and C. Sieve size Aggregate A Aggregate B Aggregate C {mm} 96 passing 96 passing 96 passing 9.50 85 50 40 4.75 70 35 30 0.60 35 20 5 0.30 25 13 1 D. 15 17 7 0 A blended aggregate mix containing aggregates A, B C. in the following proportions is required for use in a concrete mix: 0 Aggregate A: 35% 0 Aggregate B: 40% 0 Aggregate (1:2596 Using this data, determine the Percent passing each sieve for the blended aggregate mix. Question 7 10 out of 10 points Question SG in Quiz 1 Worksheet A cement paste specified for use in a concrete mix contains the following raw materials: 0 Cement = 400 ltgfm3 0 Water = 200 kgfm3 Possible changes allowed in the proportioning of these raw material contents, along with the inclusion of an admixture, are shown in the table below to meet different conditions of supply. Using the terms increase, decrease or approximately the same, indicate what will happen to the workability and ultimate compressive strength of concrete in each case if the cement paste contents are changed andfor an admixture is added. in addition, briefly explain your reasonls} for reaching each conclusion. Cement Water Type of What will happen {kg} m3} [kglmal admixture Workability Ultimate strength 400 210 None 420 210 None 400 200 WR 400 180 WR 400 200 HWR 400 200 AEA 400 200 At: 01195130" 8 10 out of 10 points Question 6B in Quiz 1 Worksheet ... 4/6 11/08/2017 Review Test Submission: Quiz 1 Binders, Aggregates, Water and The table below shows different types of cement and chemical admixtures that are available for use in a concrete mix to meet different conditions of supply at a construction site. Cement type Admixture type GP Ac HE AEA Using the above table, select both the cement and admixture types that will be best suited to meet each of the requirements presented below given a change in water-to- cement ratio and cement content is permitted for each mix to meet these needs. a] Constructing a concrete box culvert for drainage use of water and soil b] Maximising strength of concrete after 180 days age :1 Minimising extent of shrinkage in concrete after 23 days age d] Repairing a concrete member at an ambient temperature of 5"C Briefly explain your reasonls) for reaching each of the above conclusions. Question 9 0 out of 10 points Question 83 in Quiz 1 Worksheet A cement paste specified for use in a concrete mix contains the following raw materials: 0 Cement = 400 ltgfm3 - Water = 200 ltg,i'm3 Possible changes allowed in the proportioning of these raw material contents, along with the inclusion of an admixture, are shown in the table below to meet different conditions of supply. Using the terms increase, decrease or approximately the same, indicate what will happen to the workability and ultimate compressive strength of concrete in each case if the cement paste contents are changed andlor an admixture is added. ln addition, briefly explain your reasonls} for reaching each conclusion. Cement Water Type of What will happen {kg} m3} [kgfmal admixture Workability Ultimate strength 400 210 None 420 210 None 400 200 WR 400 180 WR 400 200 HWR 400 200 AEA 400 200 At: QueStlon 10 0 out of 10 points Question 2 in Quiz 1 Worksheet ... 5/6 11/08/2017 Review Test Submission: Quiz 1 Binders, Aggregates, Water and A concrete mix to be produced at a concrete batching plant is specified to contain the following four proportions of raw materials by mass: Portland cement = 140 kg fine aggregate = 300 kg Coarse aggregate = 500 kg Mixing water = 60 kg Determine the free water-to-cement ratio for this mix given the following data: Absorption capacity [AC] of coarse aggregate = 1.0% Absorption capacity [AC] of fine aggregate = 2.0% Moisture content [MC] of coarse aggregate = 0.5% Moisture content [M C] of fine aggregate = 4.0% Particle density of fine aggregate = 2,500 kg/r'rl3 Particle density of coarse aggregate = 2,600 kglm3 Particle density of Portland cement = 3,150 |cglma Friday, 11 August 2017 12:20:32 PM AEST ... 6/6 ...
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