Easy to use as an excel spreadsheet but powerful as a real database, its the ultimate tool to keep track of the quality of your concrete production. Concrete is a composite material composed of fine and coarse aggregate bonded together with. What are different tests for concrete quality check. Additional information on workability and quality of concrete can be obtained by observing the manner in which concrete slumps. Aug 14, 20 this leads to elucidation of problems surrounding the topic of workability and to an account of the potential for quality control. Quality control in concrete construction quality of.
Fresh concrete tests 231 10 12 changing concepts 236 12. Quality control of concrete on site part 1 youtube. Workability and quality control of concrete crc press book fresh concrete must be produced with the properties required for its intended applications, for example, it must be workable enough to flow into formwork, and to be compacted. Aci manual of concrete inspection reported by aci committee 311 aci 311. Pdf a study on the quality control of concrete production in. Pdf the quality control of concrete is the most important issue in. Mar 28, 2018 this talks about the preparation to the proper filling of concrete cylinders or molds, to the compaction of concrete, the ways to level the concrete surface, the curing itself up to the proper way of transporting these test specimens. Preparation guidelines for quality manual for ready mixed concrete companies february 2008 prepared by. This talks about the preparation to the proper filling of concrete cylinders or molds, to the compaction of concrete, the ways to level the concrete surface, the curing itself up to the proper way of transporting these test specimens. Concrete is a most widely used construction material, commonly made by mixing of cement with fine aggregate, coarse aggregate, water and admixture. Strictly, it is the amount of useful internal work necessary to produce 100% compaction. Quality control of concrete on site part 1 federal highway administration 1994 video vh274 tests for onsite quality verification of concrete are demonstrated in this series of four tapes. Qc has been treated as a cost center, with not much thought as to how it can benefit the bottom line of the ready mixed concrete company.
Workability of concrete is defined as the ease and homogeneity with which a freshly mixed concrete or mortar can be mixed, placed, compacted and finished. A centralmix plant offers more accurate control of the concrete quality through. If not, then water that is for concrete bonding will evaporate and henceforth concrete strength drops down from the specified value. Quality of concrete construction on site can be accomplished in three distinct stages. This book deals with the measurement of the flow properties of fresh concrete and the factors which affect its workability. Pdf ken w dayconcrete mix design, quality control and. Concrete quality control i t has been said that quality control qc does not matter once the project specifications have been satisfied. Many conventional methods have been developed for the quality control of precast concrete. Workability and quality control of concrete the word workability is a term that refers to properties of fresh concrete, that is, of the concrete before it has set and hardened, and it is legitimate to ask why any attention. Workability and quality control of concrete pdf free download. Quality management plan guidance for concrete used for. Oct 04, 2016 workability of concrete is an important property of concrete while concrete is in its fresh state. The production of concrete at each plant shall be systematically controlled. Concrete quality control is not just during the manufacturing of the concrete.
Concrete is a mixture of cement, water and aggregate. Fine and coarse aggregate of a predetermined quality is added to the cementwater paste in the batch to give bulk to the batch. This standard is important for engineers to know the ways to prepare, safe keep, and handle concrete specimens. Jul 11, 2012 concrete quality control is not just during the manufacturing of the concrete. Control cylinders should indicate the desired test age. Workability is affected by aggregate gradation, particle shape, proportioning of aggregate, amount and qualities of cementitious materials, presence of entrained air, amount and quality of high range. Aug 29, 2010 quality control of concrete on site part 2 federal highway administration 1994 video vh274 tests for onsite quality verification of concrete are demonstrated in this series of four tapes. It is not a suitable method for very wet or very dry concrete. Workability of concrete factors affecting workability of. Increasing the water content of the mix for easier workability without increasing the cement. Fresh concrete must be produced with the properties required for its intended applications, for example, it must be workable enough to flow into formwork, and to be compacted.
This is to ensure that all the concrete supplied shall be in accordance with these requirements and with the specifications that has formed the basis of the agreement between the producer and purchaser. Concrete that is stiff or dry may be difficult to handle, place, compact, and finish and, if not constructed properly, will not be as strong or durable when finally hardened. The quality of the product is tremendously important for the structural safety. The principal aim of the study was to investigate the existing practices on the quality. Goti concrete technology quality control of concrete 2. Therefore, a performancebased concrete quality control during concrete construction with documentation of achieved construction quality and compliance with the specified durability should also be. The validity and limitations of standard methods of workability assessment are fully considered and there are several chapters on the effects on workability of the properties and proportions of mix constituents.
Workability and quality control of concrete the word workability is a term that refers to properties of fresh concrete, that is, of the concrete before it has set and. A slump test can be used to measure the workability of concrete. It is apparent that workability depends on a number of interacting factors such as water content, aggregate type and grading, aggregate to cement ratio, kind and dosage of superplasticizers. The density of foam concrete generally varies from 8001600kgm3. Therefore, a performancebased concrete quality control during concrete construction with documentation of achieved construction quality and compliance with.
Quality of concrete can also be further assessed by giving a few tappings or blows by tamping rod to the base plate. Pdf a study on the quality control of concrete production. Durability of concrete may be defined as the ability of concrete to resist weathering action, chemical attack, and abrasion while maintaining its. Quality control of concrete on site part 2 youtube. Mar 22, 2018 factors affecting workability of concrete a concrete is said to be workable if it is easily transported, placed, compacted and finished without any segregation. Quality management system for ready mixed concrete companies part a. The deformation shows the characteristics of concrete with respect to tendency for segregation. Concrete is said to be workable when it is easily placed and compacted homogeneously i. The benefit of a good qa program far outweighs the costs for both the agency and contractors. Workability and quality control of concrete engineering books. Workability and quality control of concrete g h tattersall. Acronyms aashto american association of state highway and transportation officials aci american concrete institute. This booklet is a successor to the authors hugely profitable workability of concrete released in 1976 and, back, is written particularly for practicing engineers and concrete technologists. Compared to insitu concrete, rmc ensures better quality control of the concrete, more thorough mixing of the ingredients and better uniformity between batches.
Durability of concrete types of durability and factors. This tech brief looks at the elements needed to implement an effective quality assurance qa program for concrete paving operations. Rmb readymix as a commercial supplier remain as always committed to maintaining and improving the quality of our product using the best quality materials available in the country and the most advanced equipment in concrete industry. See chapter 3 concrete testing workability is affected by. Highstrength concretes may be produced with innovative materials and procedures not covered in this guide. Workability is one of the physical parameters of concrete which affects the strength and durability as well as the cost of labor and appearance of the finished product.
It increases the workability of the concrete and lowers the need for water content by 1530%. Unworkable concrete needs more work or effort to be compacted in place, also. What are the factors affecting workability of concrete. Workability of concrete is an important property of concrete while concrete is in its. Pdf traditionally, the slump test has been used to measure concrete consistency.
Specification and quality control of light weight foam concrete. This guide is not intended to restrict the use of new or innovative quality control practices or testing. The concrete slump test is known as standard test method for slump of hydrauliccement concrete and carries the code astm c 143 or aashto t 119. Best practices for concrete pavements effective quality. Top 6 important quality tests of concrete quality assurance. Quality control of concrete on site part 2 federal highway administration 1994 video vh274 tests for onsite quality verification of concrete are demonstrated in this series of four tapes. Further quality of foam concrete is depending upon the quality and type of foam is used. The use of such technologies enables companies to be more. This post describes the 3 primary stages involved in quality control in concrete construction work such as qc before concreting, qc during concreting etc. Quality control in concrete construction work civilblog. Codewriting organizations, such as the american society for testing and materials, the american concrete institute aci, and the american association of state highway and transportation of. Workability and quality control of concrete crc press book.
Workability in concrete defines its capacity to be placed, consolidated, and finished without harmful segregation or bleeding. Therefore slump test or compaction factor test should be performed to check workability. As mostly no coarse aggregate is used in the production of the foam concrete or cellular concrete, the correct terms would be called mortar instead of concrete. Workability of concrete mixture is measured by, veebee consistometer test, compaction factor test, and slump test. The ability of concrete to withstand the conditions for which it is designed without deterioration for a long period of years is known as durability.
Regardless of the projects size or importance, field quality control is necessary. This document summarizes the principles of quality control. Test for workability of concrete slump cone the ease with which one can use concrete is called. Fresh concrete must be produced with the properties required for its intended applications, for example, it must be workable enough to flow into formwork, and to. Quality tests on concrete are performed as a part of quality control of concrete structures. En 2061 concrete specification, performance, production, and conformity en 450 fly ash for concrete definitions, requirements and quality control en 9342 admixtures for concrete definitions and requirements en 1008 mixing water for concrete en 123501 testing fresh concrete. Concrete quality control test at site slump test the slump test is a means of assessing the consistency of fresh concrete. This book deals with the measurement of the flow properties. However, there are a number of issues associated with poor handling and curing of ready mixed concrete. Workability of concrete is a broad and subjective term describing how easily freshly mixed concrete can be mixed, placed, consolidated and finished with minimal loss of homogeneity. Chapter 1 components of concrete concrete is made up of two components, aggregates and paste. Sep 02, 2003 fresh concrete must be produced with the properties required for its intended applications, for example, it must be workable enough to flow into formwork, and to be compacted. The paste is composed of cement, water, and entrained air and ordinarily constitutes 20 to 40 percent of the total volume. In the united kingdom, the standards specify a slump cone height of 300 mm, a bottom diameter of 200 mm and a top diameter of 100 mm.
Webbased quality control is one of the most effective ways for this purpose. Durability of concrete transportation research board. Workability of concrete is an important property of concrete while concrete is in its fresh state. Aug 29, 2010 quality control of concrete on site part 1 federal highway administration 1994 video vh274 tests for onsite quality verification of concrete are demonstrated in this series of four tapes.
Download file pdf quality control in civil engineering. Pdf controlling the quality of fresh concrete a new approach. The workability, compressive strength and the slump loss of concrete with an without the use of admixtures shall be established during the trial mixes before use of admixtures. Concrete quality control curing concrete engineering intro. They contribute significantly to the quality of the concrete. The statistical production control screen is the musthave tool for every production and quality control manager. The use of bml viscometer for quality control of concrete. Quality management system for ready mixed concrete.
If not, then water that is for concrete bonding will evaporate and henceforth concrete strength drops. Quality management plan guidance for concrete used for construction of significant features. Quality assurance and quality control iowa state university. If two or more admixtures are used simultaneously in the same concrete mix, data should be obtained to assess their interaction and to ensure their compatibility. In order to achieve scc workability and realize the associated benefits, the materials and mixture proportions must be properly selected and the concrete quality must be carefully controlled. About three tests should be carried out for every 25 m 3 of concrete. This guide is not intended to restrict the use of new or innovative quality control practices or testing methods as they become available or necessary.
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