You are working on a concrete mix design that requires each cubic yard of concrete to have a 0.43 water-cement ratio, 2077 lb/yd3 of dry gravel 244 lb/yd3 of water, and 4% air content. The available gravel has a specific gravity of Ggravel = 2.6, moisture content of 2.3% and absorption of 4.5%. The available sand has a specific gravity of Gsand = 2.4, a moisture content of 2.2% and absorption of 1.7%. Air entrainer is to be included using the manufacturers specification of 0.1 fl. oz / 1% air / 100 lb cement. For each cubic yard of concrete needed th ich calculate the ict gravol moist

You are working on a concrete mix design that requires each cubic yard of concrete to have a 0.43 water-cement ratio, 2077 lb/yd3 of dry gravel 244 lb/yd3 of water, and 4% air content. The available gravel has a specific gravity of Ggravel = 2.6, moisture content of 2.3% and absorption of 4.5%. The available sand has a specific gravity of Gsand = 2.4, a moisture content of 2.2% and absorption of 1.7%. Air entrainer is to be included using the manufacturers specification of 0.1 fl. oz / 1% air / 100 lb cement. For each cubic yard of concrete needed th ich calculate the ict gravol moist

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 of concrete 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).
Concrete is required for a foundation located below ground where no substantial freezing and thawing occur. The 28-day compressive strength should be 4,000 lb./in2. The slump should be 2in. and the maximum aggregate size should not exceed ¾ in.The properties of the materials are as follows: Cement : Type I, specific gravity = 3.15 Coarse Aggregate: Bulk specific gravity (SSD) = 2.82;absorption capacity = 3%; dry-rodded unit weight = 125 lb./ft.3;surface moisture = 1%, Moisture content = 4% Fine Aggregate: Bulk specific gravity (SSD) = 2.60; absorptioncapacity = 1.3%; fineness modulus = 2.70; surface moisture = 2%Moisture content = 3.3% 3. The total estimated batch weight in Ib/ft^3? 4. What is the estimated batch weight of cement in 1b/yd^3? 5. What is the estimated batch weight of wet coarse aggregates in Ib/yd^3?
A concrete mix with a 75 mm slump, w/c ratio of 0.50, and sand with a fineness modulus of 2.4 contains 1009 kg/m3 of coarse aggregate. Compute the required mass of coarse aggregate per cubic meter. To adjust the mix so as to increase the compressive strength, the water–cement ratio is reduced to 0.45. Will the quantity of coarse aggregate increase, decrease, or stay the same? Explain your answer.
Students in the materials class prepared three mortar míxes with water to cement ratios of 0.50, 0.55, and 0.60. Three 50-mm mortar cubes were pre- pared for each mix. The cubes were cured for 7 days and then tested for com- pressive strength. The test results were as shown in Table P6.16. ТАBLE P6.16 Mix w/c Мaximum Compressive Average Compressive Strength (MPa) No. Ratio Cube No. Load (kN) Strength (MPa) 1 79.4 1 0.50 80.1 81.9 1. 74.7 2 0.55 2 74.5 3 72.5 1. 65.8 2 69.3 3 0.60 71.2 Determine the following: a. The compressive strength of each cube. b. The average compressive strength for each mix. c. Plot the average compressive strength versus w/c ratios for all mixes. d. Comment on the effect of increasing w/c ratio on the compressive strength of the cubes.
An air-entrained concrete mix is required for a structure that is severely exposed to sulfate. Given: Required strength 35 MPa; slump 80 mm; Coarse aggregate: 19 mm nominal maximum size. The amount of water required for this mix and the corresponding air content respectively are Select one: O A. 190 Kg and 2% O B. 184 Kg and 6% O C. 184 Kg and 3.5% O D. 205 Kg and 2%
in a ready mixed concrete plant, 28-day compressive strength results of 32-cylinder specimens prepared by using the same concrete mix design were determined as follows. Considering the overdesign required according to ASTM C94 standard, which compressive strength class can this concrete can be belonging to? Show your work. Specimen # 1 2 3 4 5 6 7 8 Compressive Strength (MPa) 25 20 23 22 20 23 23 24 Specimen # 9 10 11 12 13 14 15 16 Compressive Strength (MPa) 25 21 15 20 20 19 25 26 Specimen # 17 18 19 20 21 22 23 24 Compressive Strength (MPa) 21 15 16 22 21 27 23 24 Specimen # 25 26 27 28 29 30 31 32 Compressive Strength (MPa) 23 23 24 27 20 29 24 25
Three batches of concrete were prepared using the same materials and ingre-dients, except that they have water–cement ratios of 0.50, 0.55, and 0.60,respectively. The following tests were performed on specimens made of thethree batches:■ Compressive strength test on 4′′ * 8′′ cylinders■ Center-point flexure test on 4′′ * 4′′ * 12′′ beams■ Split tension test on 6′′ * 12′′ cylindersThree replicates were tested for each test. Table shows the average failure loads for the three replicates of each case.It is required to do the following:a. Complete Tableb. Using an Excel sheet, plot the relationships between water–cement ratio and compressive strength, modulus of rupture, and tensile strength on the same graph. Label all axes and curves.c. Comment on the effect of water–cement ratio on the compressive strength, modulus of rupture, and tensile strength.
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).
➤ 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%
The following table represents a concrete mixture that has not been completely proportioned. The values given are the theoretical mixture proportions (oven dry basis). Material properties are also provided. Please answer the question at the end of the information given. Theoretical Mixture Proportions (oven dry basis) Water Cement Air Coarse Aggregate ASTM C 150 Type I Cement: Specific Gravity: 3.15 Coarse Aggregate: Well-graded 3/4 in. NMSA rounded gravel Oven-dry specific gravity: 2.63 Absorption: 1.10% Moisture content of stockpile: 3.10 % Oven-dry bulk density: 101.5 lb/ft³ Fine Aggregate: Natural Sand Oven-dry specific gravity: 2.60 Absorption: 3.20% Moisture content of fine stockpile: 3.50% Fineness Modulus: 2.80 265 lb/yd³ 675 lb/yd³ 6.00 % 1816 lb/yd³ What is the theoretical unit weight (in lbs/yd³) of fine aggregate in this concrete mixture (oven dry basis)? Round to the nearest whole number and do not include units when entering your answer.
Subject: Concrete Technology please provide detailed solution. Q#2: a) What are the main differences between plasticizers and super plasticizers? b) What is pozzolanic material; what benefits can be achieved by using Pozzolana with cement in concrete?