Mixing of Concrete and its Testing Methodology (original) (raw)
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Examination of Concrete Mixtures – Part II Physical-Mechanical Concrete Properties
2019
Miloš Šešlija 1 Anka Starčev-Ćurčin 2 Danijel Kukaras 3 Igor Peško4 Andrija Rašeta 5 UDK: 666,972 DOI: 10.14415/konferencijaGFS2019.050 Summary: Concrete mixtures are made, or prepared with aggregates, binders and water, and in some concrete chemical additives are used to improve the properties of concrete mixtures. The paper presents the results of the physical-mechanical properties testing of fresh and hardened concrete for three different mixtures where an aggregate of three fractions is used. Cement CEM II A-M (S-L) 42.5R is used for all of three concrete mixtures. According to test results it can be concluded that all of three types of concrete can be used for concrete pavement production, as for residential-commercial buildings, bridges and other objects in civil engineering.
Study of various Grades of Concrete with and without Admixture
International Journal for Research in Applied Science and Engineering Technology IJRASET, 2020
The ingredient of concrete are mixed in different proportions, either by volume or by weight, the latter being more precise and scientific. Volume batching of concrete is not allowed by revised IS 456-2000 today and the common method of expressing the proportions of ingredients in concrete mix is in the form of parts or ratio of cement. The fine aggregate and coarse aggregate cement being taken as unity. Cubes are cured alternate wetting and drying condition (partially curing) average compressive strength of concrete cube 30.60 N/mm2. Which is approximately 60 % of target compressive strength. When cube are cost with no curing is carried out, the cube are cured in room, the average compressive strength of the cube at 28 days = 22.5 N/mm2. which approximately 58% of target which do not satisfied the requirement of target of M30 grade concrete , but it will satisfy the requirement of strength for M15 grade concrete. Therefore if the curing is not carried out site , grade of concrete used is M30 then the actual strength obtained at site. Sever cracks in concrete which affect scope serviceability, stability and safety. Which affect stability stiffness strength and seafty of the structure. Therefore curing is essential to gain the strength of concrete, for all structural element such as slab, beam. column and footing curing is to be carried out for 21 days IS code of PPC.
Experimental Study on Behaviour of Concrete Using Different Techniques
International journal of engineering research and technology, 2018
Excessive fatigue deterioration is usually experienced when reinforced concrete structural elements are subjected to loading. This underscore the desire to strengthen as well as improve the fatigue performance and extend the fatigue life of RC structural components particularly beams. During the few decades, due to rapid growth of population, past backlog and slow rate of construction strengthening of concrete structural elements by (steel fibers, rubber aggregate, eggshell powder) has become a widely used technique where high strength is needed for carrying heavy loads or repairing is done due to fatigue cracking, failure modes and corrosion. There is a need to develop appropriate techniques of construction, which are economical and affordable. Towards this end, Reinforced concrete structures construction technique has been developed. The cement concrte cubes & cylinders of Mix 40 grade were casted in which cement is partially replaced with eggshell powder as 5%.10%,15% by weight of cement. Coarse aggregate are replaced with rubber tube by 5%,10%,15% & concrete volume is replaced with 0.5%,1.0%,1.5% of steel fibre. The testing was done using "COMPRESSION TESTING MACHINE" to know the Compressive Strength & Split tensile Strength of RC structures at curing ages 7,14 & 28 days.
Accelerated strength and testing of concrete using blended cement
Advanced Cement Based Materials, 1997
Accelerated strength testing using the boiling water procedure of ASTM C 684 was performed to evaluate this test method for use in the routine quality control of concrete made of local materials with particular emphasis on the use of blended cements, and in the prediction of potential quality and strength of concrete at later ages. Large number of groups of standard concrete specimens are sampled;
2007
In this paper a series of non-destructive tests has been performed with the purpose to investigate on the mechanical properties of the concrete employed in the civil buildings. A series of specimens were prepared in order to correlate the “in situ” concrete strengths obtained by multiple combinated non-destructive methods with the cubical and cylindrical strength obtained by destructive methods. The multiple combined methods (SonReb Methods + Windsor Probe Tests) were used to quality control and strength estimation of the concrete. In particular, a series of specimens by aggregates having various Mohs’Hardness (inert of fluvial origin) and by aggregate with only a class of Mohs’Hardness (crushed aggregate) has been prepared. During the concrete casting a series of cubical specimens has been prepared. The comparison among non-destructive tests, cubical strength and cores strength are carried out.
FRESH AND HARDENED CONCRETE TESTS
Concrete; It is the most used material after water in the world. It is a non-alternative building element with its economical, abundant components in nature, high strength and durability, low cost, processability and many more features. In order for a concrete to be good, it must be impervious concrete that can protect its physical and chemical integrity, against the loads and environmental effects it is exposed to, throughout its service life. The measure of quality in concrete is not resistance to compressive strength, but resistance to environmental influences and loads that concrete is exposed to throughout its economic life. The proof of concrete quality is field performance under actual loading and environmental conditions. But before concrete experiences much of this exposure, it’s necessary to determine its acceptability and make projections about its long-term performance. These judgments are based, in part, on the results of tests performed on hardened concrete. This paper reviews that quality control of the hardened concrete in the building has been examined under two main titles. Destructive; Compressive strength, Flexural Strength and Splitting Tensile Test. Non-destructive; Rebound Hammer and Ultrasonic Pulse Velocity.
IJERT-Study of Compressive Strength of Various Grades of Concrete using Different Sizes of Cubes
IJERT-International Journal of Engineering Research and Technology (IJERT), 2015
https://www.ijert.org/study-of-compressive-strength-of-various-grades-of-concrete-using-different-sizes-of-cubes https://www.ijert.org/research/study-of-compressive-strength-of-various-grades-of-concrete-using-different-sizes-of-cubes-IJERTV4IS070455.pdf Concrete being the most versatile material of construction holds the property of stronger in compression. This property enables the concrete for most of its utility in construction. Since the strength of concrete is related to the structure hardened cement paste, it assumes more importance. The size of test specimens for compressive strength is prescribed in relevant codes, however it varies from country to country and often more than one size is permitted.The restraining effect of the platens of the testing machine extends over the entire height of a cube but leaves unaffected a part of a test cylinder. It is, therefore, to be expected that the strengths of cubes and cylinders made from the same concrete differ from one another. It is difficult to say which type of specimen, cylinder or cube, is 'better' but, even in countries where cubes are the standard Specimen, there seems to be a tendency, at least for research purposes, to use cylinders rather than cubes.In the present investigation the effect of different cube size on compressive strength of concrete have been studied. The variations have been made in the size of specimen, grade of concrete & age of concrete. Four different sizes of specimen viz: 150 mm, 125 mm, 100 mm & 75 mm were used. A total of 4 mixes were prepared by varying the grade of concrete mixes. Based on the laboratory results the compressive strength was reported to increase with the decrease in specimen size. Moreover the relative strength of concrete were obtained and it was found that it also increases with the decrease in specimen size and remains unaffected due to age and grade of concrete.
Compaction Test Method for Dry Concrete
2013
Dry concrete, also known as no-slump concrete and earth-moist concrete, is used to manufacture paving units and demands vibrocompressers to be molded. The features on the fresh state have influence on the production process, whereas the mix that are easily compacted demands less strength of the equipment and also will result on paving units that are more dense, with higher mechanical resistance and lower water absorption. However, there aren’t any test methods for the fresh state, and normally it is used empirical methods. Hence, on this paper it was develop a testing method to analyze the features of the no-slump concrete on its fresh state. The method also provides a specimen that allows testing the hardened state features. With this method is possible to obtain data on strength x time x displacement, as well as swelling, allowing to analyze which mix design is easily compacted and has less elastic recovery. To verify the method it was conducted tests using the mix design of a ref...