The name of the test used to measure the consistency and workability of fresh concrete is called the _______________ test. slump unit weight air content temperature
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- The properties of hardened concrete also affected by curing process. Analyze any possible defect occurred in concrete without curingDesign the concrete mix according to the following conditions:Design EnvironmentPavement slab, subjected to freezingRequired design strength = 21 MPaSlab thickness = 300 mmStatistical data indicate a standard deviation of compressive strength of1.7 MPa is expected (more than 30 samples).Only air entrainer is allowed.Available MaterialsAir entrainer: Manufacture specification is 9.5 mL/1% air/100 kgcement.Coarse aggregate: 2 in. nominal maximum size, crushed stoneBulk oven-dry specific gravity = 2.573, absorption = 2.8,Oven-dry rodded density = 1922 kg/m3Moisture content = 1,Fine aggregate: Natural sandBulk oven-dry specific gravity = 2.540, absorption = 3.4,Moisture content = 4.5,Fineness modulus = 2.68Design the concrete mix according to the following conditions:Design EnvironmentPavement slab, Bozeman, Montana (cold climate)Required design strength = 3000 psiSlab thickness = 12 in.Statistical data indicate a standard deviation of compressive strength of250 psi is expected (more than 30 samples).Only air entrainer is allowed.Available MaterialsAir entrainer: Manufacture specification is 0.15 fl oz/1% air/100 lb cement.Coarse aggregate: 2 in. nominal maximum size, crushed stoneBulk oven-dry specific gravity = 2.573, absorption = 2.8,Oven-dry rodded density = 120 pcfMoisture content = 1,Fine aggregate: Natural sandBulk oven-dry specific gravity = 2.540, absorption = 3.4,Moisture content = 4.5,Fineness modulus = 2.68
- @ (i) Concrete is used in a variety of applications from high-rise constructions to road pavements, bridges and floor slabs. Engineers will specify the strength of concrete mixes needed for each specific application. Compressive stress testing is carried out on test samples from concrete batches for purposes of quality control. In the space provided, sketch and label the fracture pattern of the concrete test piece after a compressive test. musgaib edt nodig Stansi VOR beforomo of bebe si giordinien fest2 quintetoeditedal budala wold Talno banoqquz odlo dianorte sliznat big or hobson axed loota 4300 GAOI (0)5. Design the concrete mix according to the following conditions: Design Environment Building frame Required design strength = 27.6 MPa Minimum dimension = 150 mm Minimum space between rebar = 40 mm Minimum cover over rebar = 40 mm Maximum slump is required Statistical data indicate a standard deviation of compressive strength of 2.1 MPa is expected (more than 30 samples). Only air entrainer is allowed. Available Materials Air entrainer: Manufacture specification 6.3 ml/1% air/100 kg cement. (Use maximum or +2% air content) Coarse aggregate: 19 mm nominal maximum size, river gravel (rounded) Bulk oven-dry specific gravity = 2.55, Absorption = 0.3% Oven-dry rodded density = 1761 kg/m3 Moisture content = 2% Fine aggregate: Natural Sand Bulk oven-dry specific gravity = 2.659, Absorption = 0.5% Moisture content = 2% Fineness modulus = 2.47Q3: B: Design the concrete mix according to the following conditions: Design Environment Building frame Required design strength = 27.6 MPa Minimum dimension = 150 mm Minimum space between rebar = 40 mm Minimum cover over rebar = 40 mm Statistical data indicate a standard deviation of compressive strength of 2.1 MPa is expected (more than 30 samples). Only air entrainer is allowed. Available Materials Air entrainer: Manufacture specification 6.3 ml/1% air/100 kg cement. Coarse aggregate: 19 mm nominal maximum size, river gravel (rounded) Bulk oven-dry specific gravity = 2.55, absorption = 3.6, Oven-dry rodded density = 1761 kg/m3 %3D Moisture content = 2.5, Fine aggregate: Natural sand Bulk oven-dry specific gravity 2.659, absorption=0.5, Moisture content = 2, Fineness modulus = 2.47
- What is the minimum strength that concrete must reach prior to freezing so that the overall strength gain is not affected? OA 5.0 MPa O B) 2.5 MPa O0 4.5 MPa OD) 3.5 MPa When testing for organic impurities in Lab 4, which colour number was deemed to be the limit for acceptable organics in the fine aggregate. ON 1 O B) 2 O D) 3 Concrete is required for the construction of an agricultural dairy barn floor slab in Central Alberta. The floor slab will be exposed to freeze/thaw conditions. Which of the following exposure classes best describes the environmental conditions that the concrete will be exposed to? O Al A-4 O B) S-2 O D) A-2 Slow setting may be caused by: O A Prolonged cold weather when protection is not provided to keep the concrete warm O B) Not having enough fly ash in the concrete OC) Cold as-delivered concrete placed during hot weather OD) Not enough water in the concrete to fully hydrate the cement < O ODesign the concrete mix according to the following conditions: Design Environment Building frame Required design strength = 27.6 MPa Minimum dimension = 150 mm Minimum space between rebar = 40 mm Minimum cover over rebar = 40 mm Statistical data indicate a standard deviation of compressive strength of 2.1 MPa is expected (more than 30 samples). Only air entrainer is allowed. Available Materials Air entrainer: Manufacture specification 6.3 ml/1% air/100 kg cement. Coarse aggregate: 19 mm nominal maximum size, river gravel (rounded) Bulk oven-dry specific gravity = 2.55, Absorption = 0.3% Oven-dry rodded density = 1761 kg/m3 Moisture content = 2% Fineness modulus = 2.47Which type of aggregate is more harmful for using in concrete? Angular Rounded Rough Elongated
- choose the correct answer Q1A- Which test gives more variable one of the modulus of rupture * 1-Center-point loading test 2-Two-point loading 3-Splitting tension test 4-Direct tension test B- Which process comes after batching in the manufacturing process of concrete? * 1-Transportation 2-Placing 3-Mixing 4-Compacting C- Excess vibration during compacting can lead to: * 1-Bleeding 2-Segregation 3-High strength 4-Air bubblesIt is the Standard Practice for Making and Curing Concrete Test Specimens in the Field A ASTM C192 B None of the Above C) ASTM C191 D ASTM C143Design the concrete mix according to the following conditions:Design Environment• Building beamo Required design strength = 27.6 MPao Minimum dimension = 150 mmo Minimum space between rebar = 40 mmo Minimum cover over rebar = 40 mmo Statistical data indicate a standard deviation of compressive strengthof 2.1 MPa is expected (more than 30 samples).• Only air entrainer is allowed.• Moderate Sulphate exposure.• Available Materialso Air entrainer:▪ Manufacture specification 6.3 mL/1% air/100 kg cement.o Coarse aggregate:▪ 19 mm nominal maximum size▪ River gravel (rounded)▪ Bulk oven-dry specific gravity = 2.55▪ Absorption = 3.6▪ Oven-dry rodded density = 1761 kg/m3▪ Moisture content = 2.5o Fine aggregate:▪ Natural sand▪ Bulk oven-dry specific gravity = 2.659▪ Absorption = 0.5▪ Moisture content = 2▪ Fineness modulus = 2.47o Cement▪ Type II (Moderate Sulphate Resistant)▪ Specific Gravity = 3.15Based on this information, find the following and summarize the findings in a table.a) Required…