Design a non-air entrained concrete mixture based on ACI volume method to satisfy the following requirements: • Assume required average compressive strength is 35 MPa • slump = 150mm The following materials are available: Cement: Type I, specific gravity = 3.15 Coarse agg: nominal maximum size = 19mm specific gravity (SSD) = 2.7 dry rodded unit weight (oven dry) = 1550 kg/m³ absorption capacity = 0.9% effective absorption = 0.7% Fine agg: specific gravity (SSD) = 2.7 fineness modulus = 2.4 absorption capacity = 1.1% moisture content = 3.5%

Design a non-air entrained concrete mixture based on ACI volume method to satisfy the following requirements: • Assume required average compressive strength is 35 MPa • slump = 150mm The following materials are available: Cement: Type I, specific gravity = 3.15 Coarse agg: nominal maximum size = 19mm specific gravity (SSD) = 2.7 dry rodded unit weight (oven dry) = 1550 kg/m³ absorption capacity = 0.9% effective absorption = 0.7% Fine agg: specific gravity (SSD) = 2.7 fineness modulus = 2.4 absorption capacity = 1.1% moisture content = 3.5%

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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Design a concrete mix for construction of an elevated water tank. Required Slump = 3”. Maximum Size of Aggregate is 19mm. The specified design strength of concrete is 30 MPa at 28 days measured on standard cylinders. The specific gravity of FA and C.A. are 2.65 and 2.7 respectively. The dry rodded bulk density of C.A. is 1600 kg/m3, and fineness modulus of FA is 2.80. Ordinary Portland cement (Type I) will be used. S.G. = 3.15 C.A. is found to be absorptive to the extent of 1% and free surface Fill out the table below.
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Use ACI method .
A concrete mix design uses coarse aggregates with NMAS of 19 mm. Fineness modulus of 2.8 and DRUW of 135 lb/ft^3. What is the mass of Coarse aggregates in the mix?
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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.
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Group B: Design a concrete mix to implement a concrete wall (exposed to sever conditions moisture and sea water or sulphates) with design compressive strength 40 MPa, a standard deviation equals to 4 and the percentage expected less than minimum strength is 5%. Sulphate Resisting Portland Cement is used. The maximum size of an angular aggregate is 40 mm with apparent density 1500 kg/m3. The available fine aggregate has fineness modulus 2.4 an air entraining agent has been used in the mix.