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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➤ 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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