Materials for Civil and Construction Engineers (4th Edition)
4th Edition
ISBN: 9780134320533
Author: Michael S. Mamlouk, John P. Zaniewski
Publisher: PEARSON
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Chapter 6, Problem 6.25QP
Discuss the problem of disposal of waste water from ready-mixed concrete operations. State three alternate methods that can be used to alleviate this problem.
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4. a. Explain the term super plasticizers. How are they useful in concrete production?
b. Explain the advantages of using plasticizers and super plasticizers in concrete making.
The environmental impact of the use of concrete has been discussed during the firsthalf of this class, as well as some solutions. Please detail the environmental impacts on the use ofconcrete. Then list and describe the solutions for these problems. Obviously as part of this answer discussthe current and potential future innovations/discoveries/advancements in concrete that can make it moresustainable than at present. Be a thorough and detailed as possible.
QUESTION 2
a) After concrete has been placed it should be consolidated either by hand tamping or by a small petrol engine, an electric motor and in some cases by compressed air. Three basic forms of vibrator are used in building works. These are the poker vibrator, vibration tampers and clamp vibrators. The contractor do not have any of the above mentioned vibrators, and will solicit the services of plant hiring firm to get one for the job. Having taken the decision to select any particular brand of vibrator, the contractor has now made up his mind to hire, instead of buying. Exposit on the benefits of hiring a plant. AP,9b) Realistic plant charges will allow several important management decisions to be taken as the logical results of scientific analysis. Determined the factors and decisions characterized the selecting of any particular plant for construction project. AN,6c) Theprocuringofmaterials,equipmentandservicesrequiredfortheoperationofabusiness,is essentially a service…
Chapter 6 Solutions
Materials for Civil and Construction Engineers (4th Edition)
Ch. 6 - What ingredients are used for the production of...Ch. 6 - What is the role of gypsum in the production of...Ch. 6 - What is a typical value for the fineness of...Ch. 6 - What are the primary chemical reactions during the...Ch. 6 - Define the C-S-H phase of cement paste.Ch. 6 - What are the four main chemical compounds in...Ch. 6 - Prob. 6.7QPCh. 6 - Define a. interlayer hydration space b. capillary...Ch. 6 - Prob. 6.9QPCh. 6 - The following laboratory tests are performed: a....
Ch. 6 - What is a false set of portland cement? State one...Ch. 6 - The watercement ratio is important because it...Ch. 6 - Discuss the effect of watercement ratio on the...Ch. 6 - Draw a graph to show the general relationship...Ch. 6 - Students in the materials class prepared three...Ch. 6 - Students in the materials class prepared three...Ch. 6 - Two batches of cement mortar with properties as...Ch. 6 - What are the five primary types and functions of...Ch. 6 - Why isnt pozzolan used with Type III cement?Ch. 6 - What type of cement would you use in each of the...Ch. 6 - In order to evaluate the suitability of nonpotable...Ch. 6 - Three standard mortar cubes were made using...Ch. 6 - Four standard mortar cubes were made using...Ch. 6 - Discuss the problem of disposal of waste water...Ch. 6 - State five types of admixtures and discuss their...Ch. 6 - Prob. 6.27QPCh. 6 - Under what condition is an air-entraining agent...Ch. 6 - If a water reducer is added to the concrete mix...Ch. 6 - Prob. 6.30QPCh. 6 - A concrete mix includes the following ingredients...Ch. 6 - The results of an experiment to evaluate the...Ch. 6 - The results of a laboratory experiment to evaluate...Ch. 6 - Referring to Table P6.34, Mix No. 1 was designed...Ch. 6 - Two batches of concrete cylinders were made with...Ch. 6 - Two batches of concrete cylinders were made with...Ch. 6 - What is the source of fly ash? Why is fly ash...Ch. 6 - A materials engineer is working in a research...Ch. 6 - A materials engineer is working in a research...
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- Why is it necessary to measure the air content of concrete at the job site rather than at the batch plant? Name one of the methods used to measure the air content of concrete.arrow_forwardDiscuss the impact of superplasticizers on the cost of placing concrete.arrow_forward1) What is the recommendations of Density, Absorption and Voids in Hardened Concrete lab test? 2) What is the errors that might happen on this lab test and how to prevent it? Recommendations for at least 4 industrial applications with details provided. do it academically and Do not copy, write it as a pointsarrow_forward
- 35.What is the workability of concrete mixtures? How to evaluate it? please quickly thanks !1arrow_forwardSelf-healing concrete. Explain why that strategy and how it can help in the product development process please provide clear explanationarrow_forwardMAKING AND CURING CONCRETE TEST SPECIMENS - Laboratory work Please answer the following questions. No plagiarism pls. thank youarrow_forward
- What is the recommendations of Bulk density of concrete lab test? What is the errors that might happen on this lab test and how to prevent it? Recommendations for at least 4 industrial applications with details provided.arrow_forwardIII. FIELD TEST FOR FRESH CONCRETE DESCRIBE and EXPLAIN what type of test is conducted on the image below for fresh concrete. What is the importance of the test in the construction industry?arrow_forward1b. Discuss some of the factors that affect strength of concrete on construction project site.arrow_forward
- Q: a) why do we need workable concrete? b) What is pozzolanic material; what benefits can be achieved by using Pozzolana with cement in concrete? c) For what purpose we use Ultrasonic Pulse velocity test? Also classify the quality of concrete if Ultrasonic Pulse velocity is 3.0km/sec? SIR, PLS GIVE ME PROPER AND CORRECT ANSWER WITH FULL DETAILS. THANKS SUBJECT: CONCRETE TECHNOLOGYarrow_forwardTwo batches of concrete cylinders were made with and without a calciumchloride (CaCl2) accelerator admixture. Six cylinders were made of each batch andsubmerged in water for different times before testing for compressive strengthand the results are shown in Table P6.35.It is required to do the following:a. Using an Excel sheet, plot the relationship between curing time andcompressive strength of the two mixes on the same graph. Label all axesand curves.b. Comment on the effect of the accelerator on the compressive strength ofPCC at early and late ages.arrow_forwardWhat are the important parameters monitored in cement production? What are the raw materials needed?arrow_forward
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