2 edition of Further development of the two-point test for the measurement of workability of fresh concrete found in the catalog.
Further development of the two-point test for the measurement of workability of fresh concrete
S. J. Bloomer
Written in English
Thesis (Ph.D.) - University of Sheffield, Dept. of Building Science, [1980?].
|Statement||by S.J. Bloomer.|
|The Physical Object|
|Pagination||420leavesleaf of plates|
|Number of Pages||420|
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Apparatus has been developed to measure the flow curve of concretes of medium to high workability. An impeller in the form of an interrupted helix is rotated uniaxially in the concrete by means of a hydraulic transmission and the torque is determined from measurement of the oil by: It is shown that fresh concrete approximates to the Bingham model and that workability cannot therefore be described by less than two constants.
A simple two-point test capable of providing the two constants is described and the significance of the present British Standard Tests Author: G.H. Tattersall. Nevertheless, fresh concrete properties are not always properly measured or predicted. The main measurement of workability, the slump test, is not always applicable; at the same slump value, two concretes may exhibit different workabilities.
On the other hand, hundreds of tests were designed over the years to measure the work-ability of concrete. Fresh underwater concrete must possess specific properties, namely the key characteristics of a self-compacting mix, and, in addition, an adequate level of washout resistance.
This is a good laboratory test to measure indirectly the workability of concrete. This test consists of a vibrating table, a metal pot, a sheet metal cone, a standard iron rod. The time required for the shape of concrete to change from slump cone shape to cylindrical shape in seconds is known as Vee Bee Size: KB.
equipment have been nominated for further development and evaluation. The evaluation and development of a procedure to measure the workability of freshly mixed low-slump concrete is described in this report.
We were unable to develop a test method that covered the full range of concrete mixtures, including high performance concrete (HPC).File Size: 2MB. Tests for Workability of Concrete at Construction Site and Recommended Values Various tests for workability of concrete at construction sites i.e slump test, Vee-bee test, Compaction factor test and its recommended values are given below.
Though slump test is originally designed as a measure of workability, it turns out to be an indicator of excessive water content in concrete only. Slump test is not considered as a measure of workability because: (i) There is no connection between the test results of slump test and workability.
Types of Workability of Concrete. Workability of concrete can be divided into following three types: Unworkable Concrete; Medium Workable; Highly Workable Concrete; 1.
Slump test procedure: STEP 1: Obtain fresh concrete from the truck. STEP 2: Fill one-third of the slump cone and tamp 25 times with a rod. (This is commonly called rodding.) STEP 3: Fill another one-third of the slump cone and tamp 25 times.
Fill the last one-third and tamp 25 times. STEP 4: Lift the cone. STEP 5: Measure the slump. Measurement of Workability Assignment Help Assignment Help: >> Fresh Concrete - Measurement of Workability. Measurement of Workability: As discussed earlier the workability of concrete, being a complex property, is difficult to define.
In addition, it is equally difficult to quantify the workability by carrying out a single test. For the last. Synopsis. Experimental results obtained by Scullion are found to be consistent with the suggestion that the slump test is a measure of the yield value of fresh concrete, and that the compacting factor test and the Vebe test each measure the apparent viscosity at an arbitrary effective rate of shear characteristic of the particular by: Procedure to determine workability of fresh concrete by compacting factor test.
i) The sample of concrete is placed in the upper hopper up to the brim. ii) The trap-door is opened so that the concrete falls into the lower hopper.
iii) The trap-door of the lower hopper is opened and the concrete is allowed to fall into the cylinder. The Kelly Ball Test: Another method used in the field and laboratory to measure the consistency of concrete is the ball penetration test (ASTM C) which is also known as the Kelly ball test.
It is performed by measuring the penetration, in inches, of a 6-in. diameter steel cylinder with a hemispherically shaped bottom, weighing 30 lbs.
One of the advantages of the. This paper tries to make a link between the measurements of the rheological properties of fresh concrete (yield stress and thixotropy) and casting processes. In the first part, methods allowing for the measurement of the yield stress of a given concrete without the use of a rheometer will be by: The time of setting (AASHTO T ) can also be used to establish the time in which the mixture is workable.
This time should be sufficient to provide time for mixing, placing, and finishing the EOT concrete. Air content of the fresh concrete is measured as an indirect indication of the air-void system in the paste. ‘workability’ of concrete.
Every inventor of a new method is convinced that he has the ultimate test for workability. In reality most methods are totally impractical, generally too expensive, and maybe measure some obscure property of concrete that is perhaps only indirectly related to the workability of concrete.
The Slump test,File Size: 1MB. Slump test is preferred for medium workability concrete mix and is not suitable for very wet or very dry concrete mixes. Although it does not measure all the factors contributing to the workability but is very useful on site to judge the relative variation in the quality of concrete.
used to describe the flow and deformation of both the concrete and mortar mixtures. Included is a comparison between concrete, mortar and paste rheology.
The Tattersall Two Point Tester was used to measure the shear resistance at two shear deformation rates. From the test results it was found that SCC can be made using South African.
The workability of fresh concrete should be characterized by its rheological properties based on material science approach to overcome the inadequacies of empirical test and is. WORKABILITY AND STABILITY OF LIGHTWEIGHT AGGREGATE CONCRETE FROM RHEOLOGY PERSPECTIVE CHIA KOK SENG ((Hons.).
Limitations in measurement of rheological parameters of fresh concrete 35 SLUMP OF FRESH CONCRETE 39 PORTLAND-CEMENT CONCRETE RHEOLOGY AND WORKABILITY: FINAL REPORT Research in recent years has sought to develop or improve other measurements of fresh concrete properties to improve on this condition.
Pitman, Boston, MA. Tattersall, G. H., and Bloomer, S. “Further development of the two-point test for workability and. Adequate selection of material constituents and test methods are necessary for workability specifications and performance of hardened concrete. An experimental program was performed to evaluate the suitability of various test methods for workability assessment and to propose performance specifications of prestressed concrete.
In total, 33 self-consolidating concrete Cited by: test (ASTM C ) alone, has resulted in the emer-gence of many new methods for characterizing the flow of freshly mixed concrete. A synthesis of more than 61 existing test methods  for workability characteriza-tion found that available devices vary widely in their geometry, cost, method of operation, and suitability for field Size: 1MB.
supplanted by better tests is instructive in recognizing trends in concrete workability research and in selecting key concepts for the development of a new test method. This document first describes key principles and trends in the measurement of workability and then describes the 61 test methods.
Based on. Although many of the devices in this document will likely never be used in the future and have been scarcely used in the past, an examination of tests that have failed and tests that have been supplanted by better tests is instructive in recognizing trends in concrete workability research and in selecting key concepts for the development of a.
this iinvestigation examines the measurement of the workability of a concrete mass. The concrete was compacted on a vibrating table and the compaction recorded.
The area under the resulting curve was measured with a planimeter. This area is a realiable measure for the useful part of the applied by: 2. This document first describes key principles and trends in the measurement of workability and then describes the 61 test methods.
Based on the successes and failures of past test methods and the current needs of the concrete industry, requirements for new test.
The Kelly ball penetration test measures the penetration of a 30 lb. hemisphere into fresh concrete. This test can be performed on concrete in a buggy, open truck, or in form if they are not too narrow.
It can be compared to the slump test for a measure of concrete. Free Online Library: Measurement of workability of fresh concrete using a mixing truck.
by "Journal of Research of the National Institute of Standards and Technology"; Chemistry Physics Science and technology, general Concrete Concretes Rheology. This book is a successor to the author's highly successful 'Workability of Concrete' published in and, again, is written specifically for practising engineers and concrete technologists.
It incorporates the results of a further 15 years research and develops the treatment of workability as a property to be measured in terms of two. The slump test is a test used extensively on construction site all over the world.
The slump test does not measure the workability of concrete, although it has been described as a measure of consistency, but the test is very useful in detecting variations in the uniformity of a mix of nominal proportions. Correlation between Yield Stress and Slump: Comparison between Numerical Simulations and Concrete Rheometers Results.
Authors; () further development of the two-point test for workability and extension of its range. Magazine of Concrete Research – Toward a rationalization of the slump test for fresh concrete: comparisons Cited by: Workability can be measured by the concrete slump test, a simple measure of the plasticity of a fresh batch of concrete following the ASTM C or EN test standards.
Slump is normally measured by filling an " Abrams cone " with a sample from a fresh batch of concrete. further by Domone and Banfill  and the current computer assisted model of the Two−point apparatus is available commercially . Following calibration it can deliver the yield stress and plastic viscosity of fresh concrete in fundamental units.
Other, broadly equivalent, approaches to the measurement of fresh concrete rheology have. Workability of Concrete Compacting Factor Test TO FIND THE WORKABILITY OF FRESH CONCRETE | All about Workability of Concrete, Slump Test, Vee Bee Test and Compaction Factor Test - Duration.
The concrete slump test is used for the measurement of a property of fresh concrete. The test is an empirical test that measures the workability of fresh concrete. More specifically, it measures consistency between batches. The test is popular due to the simplicity of apparatus used and simple procedure.
Tattersal Two-Point Test. This is the first and most widely known instrument for measuring the flow properties of concrete. The apparatus (Fig. 17) consists of a bucket containing the concrete to be tested.
A vane of special. Summary of Concrete Workability Test Methods, by Eric P. Koehler and David W. Fowler; ICARQuantification of Concrete Workability by Means of the Vibrating Slope Apparatus, by Kainan Bodenlos; and ICAR F, Development of a Portable Rheometer for Fresh Portland Cement Concrete, by Eric P.
Koehler and David W. Fowler. Workability of Concrete is a property of freshly mixed concrete (concrete is a mixture of cement, aggregate, water & admixture) which is easily transported, placed, compacted and finished without any segregation.
Due to this all the properties of.The Vebe test (also called the Vee-Bee test) allows the for the evaluation of freshly mixed concrete, measuring its workability by determining the characteristics of mobility and compactibility. The principle of the test is to change the shape of the concrete and measure the remolding in seconds.
Results of numerical flow simulations for two slump geometries, the ASTM Abrams cone and a paste cone, are presented. These results are compared to experimental results in the case of a cone filled with cement pastes in order to validate the proposed numerical method and the chosen boundary conditions.
The correlation between slump and yield stress obtained Cited by: