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Questions - IMI - Irving Materials, Inc.

A. Slump refers to how wet or dry fresh concrete is upon delivery. Slump is based on a 12 inch scale. The lower the slump number, the drier the concrete will be. A slump of 1 is very dry concrete, while a slump of 12 will run like water. This is a key piece of information that we will need to mix your concrete batch.

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Concrete Technology Objective Questions with Answers pdf ...

Concrete Technology Objective Questions with Answers pdf - Set 17 ... According to Water-Cement Ratio Law, the strength of workable plastic concrete (A) Depends upon the amount of water used in the mix (B) Does not depend upon the quality of cement mixed with aggregates (C) Does not depend upon the quantity of cement mixed with aggregates (D ...

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300+ TOP Concrete Technology Questions and Answers 2021

Concrete Technology Questions :-1. Concrete grows with age. This statement is (a) true (b) false (c) debatable (d) given by Duff Abrams. 2. Concrete in the structural member has to pass through (a) plastic stage (b) hardened stage (c) both (a) and (b) above (d) neither (a) nor (b) 3. Separation of the coarse aggregate from mortar is called (a ...

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How Aggregate Cement Ratio Affect Workability of Concrete ...

Oct 26, 2017· When the weight of cement is more, i.e. aggregate cement ratio is less, the concrete has more cement paste required to coat aggregates and fill the voids between them. This more cement paste makes the concrete relatively easy to mix, place and compact as it reduces the friction between aggregates and allows its smooth movement.

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Aggregates, Concrete & Asphalt Q&A - Aggregate Research

Members can ask as many questions as they need to (click on the red ASK QUESTION button or click here ). To register for this site click here. Select category Aggregates (15) Asphalt (2) Business (1443) Cement (4) Concrete (9) Contracting (2) Environment (2) Legislation (2) Other (139) Plant (11) Technology (2146) Sort by: Newest First.

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Practical Grading of Aggregates | Concrete Technology

The suitability of the fine sand of zone 4 for use in reinforced concrete should be tested. For sands, the sand content of the mix should be low whose greater part is smaller than 60C micron. In general, finer the grading of the fine aggregate, higher should be the coarse/fine aggregate ratio. Typical values are shown in Table 4.23.

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Aggregates for Concrete - Memphis

Coarse aggregates (Fig. 5-2) consist of one or a com-CHAPTER 5 Aggregates for Concrete bination of gravels or crushed stone with particles predominantly larger than 5 mm (0.2 in.) and generally between 9.5 mm and 37.5 mm (3⁄ 8 in. and 11⁄ 2 in.). Some natural aggregate deposits, called pit-run gravel, consist

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10 Questions to Ask a Concrete Contractor - Port Aggregates

Multiple Choice Questions on Concrete Technology - Set 07 MCQ Concrete Technology Edit Practice Test: Question Set - 07. 1. Finer grinding of cement ... The aggregate impact value of the aggregate used in (A) Building concrete is less than 45 (B) Road pavement concrete is less than 30 (C) Runway concrete is less than 30 (D) All the above ...

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Aggregate Gradation Matters| Concrete Construction Magazine

Jan 06, 2016· Question: We are having problems entraining air and maintaining slump. Our sand gradation has changed, but our supplier says it still meets ASTM C33. Shouldn't the concrete stay the same if the sand still meets the requirements? Answer: How we purchase and sell aggregates is quite different, and it can lead to trouble. Most specifications ...

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240 questions with answers in CONCRETE STRUCTURES ...

Sep 12, 2021· The most common classification of aggregates on the basis of bulk specific gravity is lightweight, normal-weight, and heavyweight aggregates. In normal concrete the aggregate weighs 1,520 ...

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Solved Despite being the strongest constituent material in ...

Question: Despite being the strongest constituent material in concrete, coarse aggregates for concrete are still specified to a nominal size, briefly explain why this is inevitable. This problem has been solved! See the answer See the answer See the answer done loading.

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Concrete Temperature and SCC| Concrete Construction Magazine

Jun 15, 2002· At a Dec. 2, 2001 meeting, committee members approved the formation of C09.47 on Self-Consolidating Concrete and Fred Kinney of Essroc was named subcommittee chairman. For more information, contact Jim Olshefsky, ASTM's staff manager of C09, Concrete and Concrete Aggregates, at [email protected]

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What Concrete Uses No Rocks or Gravel? | Concrete Questions

Concrete Aggregates. During the introduction of this article, I've thrown the word "aggregate" around a lot. Simply put, an aggregate is a material or component that creates a whole when mixed with other components. Concrete aggregates are additives of sand, cement, rock, and gravel that make up the whole of a concrete mix. Every mix has ...

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The Ultimate Concrete Quiz | HowStuffWorks

You have your wheelbarrow, concrete mixer and shovel all ready. But the hard part of making concrete, even with the best of tools, is getting the mixture right. Concrete has been used for centuries, but the concrete mixtures used today have come a long way from the mud mixtures that were once used. Take this quiz to see what you know about how concrete is made.

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Frequently Asked Questions - concrete.org

Question: The effect of aggregate strength on concrete strength. Question: What correction should be made for absorbed water and surface water carried by the aggregates? Question: The effect of changes in proportions of the fine and coarse aggregate or the quantity of cementitious material on the strength. Question: Characteristics of aggregate ...

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Concrete: Quizes - Materials Science and Engineering ...

Aggregate makes the concrete stronger and cheaper. NAME__KEY_____ CONCRETE QUIZ 2. What can be used to slow the hardening of concrete (give example?) Why would slowing this process be desirable? Sugar can be added to the concrete to retard hardening. For example, if the concrete needs to be transported a long distance, then a retarding ...

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Concrete Questions and Answers - CEMEX USA - CEMEX

Concrete is used for the finished products, such as sidewalks, foundations, and the surface of many roads. Concrete contains sand, gravel and cement. Cement is the special hardening ingredient (the gray powder) that makes concrete harden. Cement is usually made of 60% lime (limestone), 25% silica, 5% alumina, and 10% other materials, such as ...

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Questions on Concrete Flashcards | Quizlet

How many minutes should be allowed for mixing eight 3 yd.³ batch of concrete mixer after all materials have been placed in the mixer 1-1/2 minutes 1 min for 1st cu yd, then 15 seconds for each additional yard.

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Multiple Choice Questions on Concrete Technology - Set 07 ...

Multiple Choice Questions on Concrete Technology - Set 07 MCQ Concrete Technology Edit Practice Test: Question Set - 07. 1. Finer grinding of cement ... The aggregate impact value of the aggregate used in (A) Building concrete is less than 45 (B) Road pavement concrete is less than 30 (C) Runway concrete is less than 30 (D) All the above ...

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Recycled Concrete Aggregate - an overview | ScienceDirect ...

Recycled concrete aggregate (RCA) is the designation used in BS 8500-2 for recycled aggregate principally comprising crushed concrete. Designations of recycled aggregate other than RCA are of lower quality and may contain significant quantities of masonry which would preclude or limit their use in structural concrete.

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ACI Sample Examination Questions Flashcards - Cram.com

If the aggregate correction factor for a given source of fine and coarse aggregate is found to be 0.2% in a pressure air meter, and an air content value of 5.0% is read on the gage of the same air meter containing concrete with the same aggregate, what is the correct air content?

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The Effect of Aggregate Properties on Concrete

The Effect of Aggregate Properties on Concrete Concrete is a mixture of cementious material, aggregate, and water. Aggregate is commonly considered inert filler, which accounts for 60 to 80 percent of the volume and 70 to 85 percent of the weight of concrete.

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Concrete and Aggregate Testing: An ASTM How-to Guide ...

Content Straight from the Experts. The idea that wisdom is knowledge shaped by practical experience goes to the heart of the gray pages. The manual is written, maintained, and edited by ASTM members of Subcommittee C09.97 with wide and deep real-world backgrounds in concrete and aggregate testing.

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exposed aggregate concrete question - Houzz

exposed aggregate concrete question. We are in the beginning stages of planning for an inground pool. Since we are new to this pool "business," my question lies with the pool surround. Pavers are out of question- they are simply too expensive. I thought we would go to simple concrete to be cost effective. My husband likes the exposed aggregate.

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Concrete Structures Important Question and answer

4. In designing concrete structures, normally maximum aggregate sizes are adopted with ranges from 10mm to 20mm. Does an increase of maximum aggregate size benefit the structures? To answer this question, let's consider an example of a cube. The surface area to volume ratio of a cube is 6/b where b is the length of the cube.

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Frequently Asked Questions - concrete.org

Question: The effect of maximum size of aggregate on concrete strength. Question: What correction should be made for absorbed water and surface water carried by the aggregates? Question: How is the air content of freshly mixed concrete determined? Question: Popouts or popoffs? Question: Using cube tests in lieu of cylinder tests. Question: How ...

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[Solved] According to I.S. specifications concrete should ...

Q2. The cement content in a mix design is 378 kg/m3, water content 170 kg, sand is 30% of the total aggregate, entrapped air is 1%, specific gravity of cement, coarse aggregate and fine aggregate are respectively 3.15, 2,60 and 2.60. the fine aggregate will be approximately:

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What are high-density aggregates?

A. High-density aggregates generally consist of high-density minerals or rocks, or they consist of man-made materials, such as steel or iron. High-density aggregates are used to produce concrete that has higher than normal density, usually for radiation shielding or an application where high-density concrete is needed for counter balancing ...

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CEMENT CONCRETE MIX DESIGN - Dronacharya

aggregates. For e.g., a concrete mix of proportions 1:2:4 means that cement, fine and coarse aggregate are in the ratio 1:2:4 or the mix contains one part of cement, two parts of fine aggregate and four parts of coarse aggregate. The proportions are either by volume or by mass. The water-cement

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Concrete Technology MCQ Practice Questions (Civil Eng) Set 4

Pick up the correct statement from the following: Options are : 20 bags of cement make one tonne. The weight of ingredients of concrete mix, is taken in kilograms. The finished concrete is measured in cubic metres. Water and aggregates are measured in litres.

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