Q1). Answer the followings:FORWAThe rate of hy dration decreases continuously with time, why?3-How can the progress of hydration of cement be determined?4 bist and explain factors that affecting the setting of Portland cement.5- What is relationship between aggregate surface texture and concretestrength?6-What are the factors governing the selection of maximum aggregate size?7-List and explain factors that affecting the workability of fresh concrete.8- What are the most effective means in reducing concrete bleeding?9- What are the difficulties in hot weather concreting?10-What is the purpose of trial mixes in a mix design of concrete?

7) Workability of fresh concrete : let's understand in a simple words: property by which the…

7-List and explain factors that affecting the workability of fresh concre 8- What are the most effective means in reducing concrete bleeding? - What are the difficulties in hot weather concreting? 10-What is the purpose of trial mixes in a mix design of concrete?

7-List and explain factors that affecting the workability of fresh concre 8- What are the most effective means in reducing concrete bleeding? - What are the difficulties in hot weather concreting? 10-What is the purpose of trial mixes in a mix design of concrete?

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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Concept explainers

Pricing Concrete Work

The concrete work in a project usually holds a high-end cost in terms of cost and value of the work. It becomes an important step in calculating the cost associated with concrete while preparing the project scale. The cost of making concrete depends on the cost of building materials, mixed materials, labor, and machinery. A concrete contractor builds structures from concrete, usually managing all the steps of the process from assembling ingredients to building a holding structure and preparing the mixture. This person or team oversees the delivery and unloading of goods to ensure that they are done properly. Nowadays, most of the concrete in the United States comes from manufacturers working abroad, usually with branches and plants within the provinces. Contributions can range from pre-mixed concrete to basic ingredients, the consumer company then mixes it. Many American-based concrete companies, however, offer concrete products, such as ballads, bricks, countertop, concrete pipe, and building products, as well as concrete construction and installation materials. This article covers both types of suppliers for this set of building materials.

Question

Q1). Answer the followings:
FORWA
The rate of hy dration decreases continuously with time, why?
3-How can the progress of hydration of cement be determined?
4 bist and explain factors that affecting the setting of Portland cement.
5- What is relationship between aggregate surface texture and concrete
strength?
6-What are the factors governing the selection of maximum aggregate size?
7-List and explain factors that affecting the workability of fresh concrete.
8- What are the most effective means in reducing concrete bleeding?
9- What are the difficulties in hot weather concreting?
10-What is the purpose of trial mixes in a mix design of concrete?

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What is the effect of water–cement ratio on the permeability of hardened concrete? How does permeability affect the durability of the concrete structure?Using Figure 7.33, what is the approximate percent increase in the coefficientof permeability if the water–cement ratio increases from 0.5 to 0.6? Using thesame figure, what is the approximate percent increase in the coefficient ofpermeability if the water–cement ratio increases from 0.5 to 0.7?
Given the following data:Slump Requirement = 4"Max. Aggregate Size = 1.0"Water/cement Ratio = 0.55Mass of Cement = 350.91kg/m3Mass of the Coarse Aggregates= 1072 kg/m3Total Mass of the Concrete2375 kg/m°Compute for the mass of FineAggregates
The moisture content of coarse aggregate is 0.60%. If the mass of the aggregate is 1,290 kg, adjust the mass of the aggregate. If the volume of sand is 0.30 cubic meter and its specific gravity is 1.50, what is the mass of the sand? If the mass of mixing water is 175 kg, and the required water-cement ratio is 0.65, how much cement powder is needed in the concrete mix? If the target slump of concrete is 160 mm, the maximum nominal size of the coarse aggregate is 37.5 mm, and the smallest nominal size is 9.5 mm, what is the estimated entrapped air in the ordinary concrete mix? The nominal maximum size of coarse aggregate is 25mm, the fineness modulus of coarse aggregates is 2.80, dry rodded mass of coarse aggregates is 1,100 kg and the fineness modulus of fine aggregates is 2.50. How much coarse aggregates is needed in the concrete mix? If the nominal maximum size of coarse aggregates is 25mm, what is the first estimate of air-entrained concrete?
Design a concrete mix for the following performances and ingredients:• Characteristic compressive strength 50 N/mm2 at 7 days• Defective rate 1 %• Previous control data: standard deviation 5 N/mm2• Cement: class 52.5• Slump required, 30-60 mm• Maximum cement content 550 kg/m3• Coarse aggregate: Crushed single sized 10 mm• Fine aggregate: Uncrushed with 45% passing 600 μm sieve• Relative density of aggregate : 2.7 (assumed)• Volume of trial mix : 0.08 m3Note: the constant k used to find the margin, which is in turn used to determine the target compressive strength is as shown the table below: k for 10 % defectives = 1.28 k for 5% defectives = 1.64 k for 2.5% defectives= 1.96 k for 1% defectives= 2.33
Q2:-From the sieve analysis (grading test), the following results are obtained: Sieve size, ASTM ‘Weight of aggregate retained on each sieve (gm) 1% inch 0 3/4 inch [ 840 3/8 inch [ 2100 No.d [ 560 No.8 | 286.8 No.16 [ 360 No.30 3272 No.50 358 No.100 [46 Pan ‘ 22 Calculate the followings: 1-Fineness modulus of the aggregate. 2-Average sieve size. 3-Maximum aggregate size. 4- Minimum cement content (Cos)
Given the following data: Slump Requirement = 4" ements Max. Aggregate Size = 1.0" nts Water/cement Ratio = 0.55 Mass of Cement = 350.91 kg/m³ Mass of the Coarse Aggregates = 1072 kg/m³ Total Mass of the Concrete = 2375 kg/m³ Compute for the mass of Fine Aggregates.
Q2) Calculate the volumes of the hydration products for 150 gm of cement with 0.5 w/c ratio, assume there is no external water can penetrate.
Q1 What moisture condition should the coarse and fine aggregate be in when mixing the concrete? A Unknown B Saturated C Oven Dry D Air Dried E SSD Q2 What restriction is placed on the size of a sample of a concrete batch? A 30 L B 15 L C 20 L D 10 L E 5 L
Q1. What is the role of gypsum in the production of Portland cement? And explain thefour main chemical compounds in Portland cement explain with all the details? Q2. Explain the hydration process for different compounds of cement with the chemicalreactions during hydration and their products and properties of final products.
Subject = Concrete technology Q: a) Why setting time test is performed on cement? b) Explain and state visual stability index, if in slump flow test there occurs clear segregation and bleeding of halo greater than 10mm in self compacting concrete? c) Propose suitable Methods of finding Workability of Dry, Normal and Self Compacting Concrete ? (Note: Write only names of Experiments)
The relative density of cement is 3.5. Ans for a): 3%; b) cement 12.7%, water 18.0%, coarse agg 42.1%, fine agg 24.2%
Assumng class A concrete mix, compute for the following: a. Total number of 40kg cement bags b. Quantity of sand in cu. m c. Quantity of gravel in cu. m.