How much ice is required to reduce the temperature of the following fresh concrete to 16°C. If the w/c ratio is to remain same, find also the amount of water to be added to the concrete. (Neglect the aggregate moisture) Mix proportion = 1:1.8:4.5, w/c ratio= 0.6, cement content = 300 kg/m³ Temp. of cement =18 °C, temp, of water- 20 °C, temp. of aggregate= 30 °C. L=ratio of latent heat of fusion of ice to the specific heat of water= 80 °C. T = 0.22(TaWa+ TcWc) + TwWw+TwaWwa-80Wi 0.22 (Wa+Wc) + Ww + Wwa + Wi

How much ice is required to reduce the temperature of the following fresh concrete to 16°C. If the w/c ratio is to remain same, find also the amount of water to be added to the concrete. (Neglect the aggregate moisture) Mix proportion = 1:1.8:4.5, w/c ratio= 0.6, cement content = 300 kg/m³ Temp. of cement =18 °C, temp, of water- 20 °C, temp. of aggregate= 30 °C. L=ratio of latent heat of fusion of ice to the specific heat of water= 80 °C. T = 0.22(TaWa+ TcWc) + TwWw+TwaWwa-80Wi 0.22 (Wa+Wc) + Ww + Wwa + Wi

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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You are working on a concrete mix design that requires each cubic yard ofconcrete to have 0.45 water–cement ratio, 1165 kg/m3 of dry gravel, 4% air content, and 335 kg/m3 of cement. The available gravel has a specific gravity of Ggravel = 2.7, a moisture content of 1.6%, and absorption of 2.4%. The available sand has a specific gravity of Gsand = 2.5, a moisture content of 4.8%, and absorption of 1.5%. For each cubic meter of concrete needed on the job, calculate the mass of cement, moist gravel, moist sand, and water that should be added to the batch. Summarize and total the mix design when finished (don’t include air entrainer in summary).
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➤ GOAL: Design a concrete mixture for the following specifications • Plain concrete interior beam •Required average 28 day compressive strength of the concrete, f'c = 30 MPa Exposure Condition: Very Mild (protected from cold weather, chemicals, etc) •No admixture needed TYPE I PORTLAND CEMENT Specific Gravity (SG) 3.15 FINE AGGREGATE (natural sand) Bulk dry SG 2.64 Fineness Modulus 2.80 Moisture Content (MC) op 6% Absorption Capacity (AC) 0.7% COARSE AGGREGATE (well graded gravel, some crushed) Bulk dry SG 2.70 Dry-Rodded Unit Weight 1600 kg/m³ Nominal Maximum Size Aggregate 37.5 Moisture Content (MC) SSD 0.5% Absorption Capacity (AC) 1.3%
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Calculate the weight of cement that should be in a batch if the design mix requires concrete to have water-cement ratio of 0.45, dry gravel of 1258 kg/m3, water of 122 kg/m3 and 6% of air content. Use the following: Gravel Specific Gravity = 2.65 Moisture Content = 2.5% Absorption = 4% Sand Specific Gravity = 2.42 Moistur Content = 2.17% Absoprtion = 1.86 % Select the correct response: 253.16 kg/m3 O 122 kg/m3 395.56 kg/m3 271.11 kg/m3
PROBLEM 1 Given the following parameters, design a Concrete Mix Design ACI Method Required average strength will be 28MPa with slump of 75 to 100mm. The coarse aggregate has a nominal maximum size of 25 mm and a dry-rodded mass of 1900kg/m'. Other properties of the ingredients are: Cement Type I specific gravity 3.15 Coarse aggregate bulk specific gravity 2.75 absorption 3% Fine aggregate bulk specific gravity 2.68 absorption 1.2 % fineness modulus 3 Adjustment for Aggregate Moisture: Tests indicate total moisture of 5 percent in the coarse aggregate and 8 percent in the fine aggregate.
Concrete