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factors affecting concrete strength up on test

  1. factors affecting concrete strength up on test

    factors affecting concrete strength up on test Tensile Strength of Concrete Reviews briefly the factors affecting the strength of concrete in tension and presents test results showing the effects of precompression rate of loading and

  2. Factors Affecting Properties Of Concrete dailycivil

    Jun 14 2018nbsp018332Factors Affecting Properties Of Concrete The factors which affect the properties of concrete (workability bond strength tensile strength creep shrinkage bleeding segregation etc) are described below. 1. Watercement Ratio Strength elasticity durability and impermeability of concrete are increased with the decrease in watercement ratio provided the concrete is workable.

  3. FACTORS AFFECTING DURABILITY OF CONCRETE

    Sep 03 2016nbsp018332Although compressive strength is a measure of durability to a great extent it is not entirely true that strong concrete is always a durable concrete. For example it is structurally possible to build a jetty pier in marine conditions with 20 Mpa concrete environmental conditions can lead this structure to disastrous consequences.

  4. 5 Methods for OnSite Evaluation of Concrete Strength

    Dec 07 2016nbsp018332Onsite evaluation of concrete strength is a main challenge in the condition assessment of existing infrastructure. Owners and managers of such facilities prefer nondestructive methods to avoid further damage to an already struggling structure. 1 Compression Test On Concrete Cores. Coring and testing for strength might the first and most

  5. 4 MAJOR FACTORS AFFECTING CONCRETE MIX

    Mar 19 2016nbsp018332Strength is an important characteristic of concrete but other characteristics such as durability permeability and wear resistance may be equally or more important. These may be related to strength in a general way but are also dependent on other factors. For a given set of materials strength is inversely proportional to the w/c.

  6. FACTORS AFFECTING THE WORKABILITY OF CONCRETE

    The objective of the research is mainly to check the factors affecting workability of concrete incorporating PFA. This objective then can be divided into more small objectives by dividing it into the experiment that will be done which are quot To investigate the paste consistency of cement plus PFA.

  7. 8 Factors that Affect the Workability of Fresh Concrete

    The Factors that Affect the Workability of Concrete are Given Below Water content will have important influences on the workability in given volume of concrete. The higher the water content per cubic meter of concrete the higher will be the fluidity of concrete which affect the workability.

  8. Concrete Slump Should Not Be Specified

    Mar 14 2017nbsp018332Concrete Slump Should Not Be Specified. The floor placement is running smoothly. Concrete slumps have ranged from 4 to 6 in. the specification requirements and the last truck is on site with about 12000 cu. yd. of concrete on the ground. But then a slump test on that last truckload yields a 6 189in. result verified by a retest.

  9. Factors Influencing Concrete Strength

    International Concrete Abstracts Portal. The effect of mix proportions type and brand of cement availablity of moisture for curing accelerators and curing temperatures on the rate and potential strength development of concrete are discessed. The influence of rate and frequency of load applications dimensions of test specimens

  10. PortlandCement Concrete Rheology and Workability

    A sample of concrete is molded with the slump cone inside a larger cylinder. A large clear disc rests on top of the molded concrete. The vibration time required for the slump mold to remold into the larger cylinder is measured. This test is suitable only for dry concrete (50.8mm (lt2in) slump).

  11. Variability of Compressive Strength of Shotcrete in a

    other factors including the skill set of the nozzleman applying the shotcrete can also affect compressive strength. The shotcrete method used wet versus drymix and accelerator addition at the nozzle may also affect compressive strength and variability. During recent shotcrete ground support projects

  12. Compaction Factor Test Workability of Concrete The

    Compaction Factor Test Workability of Concrete. Compaction Factor Test is designed in such a way that it can be used only in laboratory but in some cases it can be used for field concrete tests. The compacting factor test has been developed at the Road Research Laboratory in United Kingdom.

  13. EFFECTS OF AGGREGATE TYPE SIZE AND CONTENT

    The effects of aggregate type size and content on the behavior of normal and highstrength concrete and the relationships between compressive strength flexural strength and fracture energy are discussed. The concrete mixtures incorporate either basalt or crushed limestone aggregate sizes of 12 mm ('h in.) or 19 mm (:Y. in.) and

  14. The 28Day Myth National Precast Concrete Association

    Oct 28 2013nbsp018332Specifying concrete strength is normally done with a minimum compressive strength (psi) at a certain age (days). Specified concrete compressive strength is the minimum compressive strength at which the concrete should fail in standard tests of 28dayold concrete cylinders.

  15. Effect of Rate of Loading on Compressive Strength of

    False strength of concrete proves fatal as it may fail due to various factors in the long terms. Therefore to ensure the functional performance and safety of structure it is necessary to determine the true strength of concrete. In this project the effect of high rate of loading on compressive strength of concrete has been studied. As it has

  16. Air entrainment and its effects in concrete Aggregate

    Factors Affecting Air Entrainment The airvoid system created by using airentraining agents in concrete is also influenced by concrete materials and construction practice. Concrete materials such as cement sand aggregates and other admixtures play an important role in maintaining the airvoid system in concrete.

  17. Proper use of the Rebound Hammer Updated to

    Proper use of the Rebound Hammer . Updated to reflect the changes to ASTM C805 . The Rebound Hammer has been around since the late 1940’s and today is a commonly used method for estimating the compressive strength of inplace concrete. Developed in 1948 by a Swiss engineer named Ernst Schmidt the device measures the hardness of concrete surfaces

  18. What are the factors affecting the setting time and

    Jun 10 2017nbsp018332SETTING TIME TYPE OF CEMENT QUICK SETTING CEMENT has an initial setting time of 5 minutes and final setting time as 30 minutes. WATER CEMENT RATIO Less water content will lead to premature setting which is definitely something that we doesnt

  19. September 1 2003 CONCRETE MANUAL 5694.500

    Concrete strength varies with age. Under con tinuous favorable conditions concrete continues to gain strength indefinitely. Samples of concrete taken from old pavements and tested in compression indicate higher strengths after 25 years th an when the pavement was 1 to 3 years old. Tests for concrete strength are made shortly after it has been placed (7 to 90 days). It is always

  20. An Evaluation of Factors Affecting the Tensile

    Report No. 982 quotAn Evaluation of Factors Affecting the Tensile Properties of AsphaltTreated Materialsquot by William o. Hadley W. Ronald Hudson and Thomas W. Kennedy discusses factors important in determining the tensile strength of asphalttreated materials and reports findings of an evaluation of eight of these factors.

  21. Resist234ncia e deformabilidade de blocos vazados de

    material’s properties. Three concrete strength levels were defined to simulate distinct deformability conditions. The further steps of the ongoing research are the performance of new test series and the calibration of theoretical models for direct and reverse analyses. Many factors affect the compressive strength test results of ma

  22. Published in Revista IBRACON de Estruturas e Materiais 183 2009Authors C S Barbosa 183 Joao Bento De HanaiAffiliation University of Sao Paulo
  23. 5. FRESH CONCRETE Civil Engineering Department

    but causes a loss of strength up to about 15 percent. Factors affecting workability Kelly Ball Test It is practical in field test. Total 28 Chapter 5 Fresh Concrete 6 . Measurement of Workability 1. SLUMP TEST •This is a test used extensively in site work all

  24. Evaluation of Migration Characteristics of OPC Concrete

    Chloride ion diffusion is one of the main factors affecting the durability of reinforced concrete structures. The purpose of the present study is to evaluate the chloride migration coefficient under accelerated test conditions. Accelerated test methods permit migration rates to be evaluated for a specific mix design in a relatively short time.

  25. Relation Between Compressive and Tensile Strength of Concrete

    Compressive Strength The main measure of the structural quality of concrete is its compressive strength. This property of concrete is commonly considered in structural design. Depending on the mix (especially the watercement ratio) and time and quality of the curing compressive strength of concrete can be obtained up to 14000 psi or more. Commercial production of concrete with ordinary

  26. Critical Factors Affecting Asphalt Concrete Durability

    Critical Factors Affecting Asphalt Concrete Durability 5. Report Date August 2016 6. Performing Organization Code Wisconsin Highway Research Program 7. Authors Ramon Bonaquist 8. Performing Organization Report No. 9. Performing Organization Name and Address Advanced Asphalt Technologies LLC 40 Commerce Circle Kearneysville WV 25430 10.

  27. Factors Affecting the Mechanical Properties of Cement

    A study has been conducted to investigate the mechanical properties of cementmixed gravel using the unconfined compression test and the tensile test. Basic factors including the curing period the waterbinder ratio the cement content and the strain rate were evaluated. Ordinary Portland cement with fly ash was employed as the cementation agent for preparing cemented samples.

  28. Creep Of Concrete Factors Affecting Creep Of Concrete

    Dec 31 2016nbsp018332Factors Affecting Creep Of Concrete The factors that affect creep of concrete are similar to the factors affecting shrinkage which are as following 1. Watercement Ratio The rate of creep is increased with increasing water cement ratio. 2. Humidity It is influenced by humidity and drying condition of the atmosphere.

  29. Ultrasonic Pulse Velocity Method Civil Engineering Portal

    This test is done to assess the quality of concrete by ultrasonic pulse velocity method as per IS 13311 (Part 1) 1992. The underlying principle of this test is The method consists of measuring the time of travel of an ultrasonic pulse passing through the concrete being tested.

  30. CONCRETE COMPRESSIVE STRENGTH SHRINKAGE

    of the reinforcements are a few of the factors which affect the bond strength between steel and the concrete. Little research work related to bond strength of fly ash concrete has been published. SCOPE OF INVESTIGATION This research work was undertaken to determine the influence of inclusion of fly ash and temperature on strength drying shrinkage

  31. Estimating Concrete Workability Based on Slump Test with

    Concrete workability quantified by concrete slump is an important property of a concrete mixture. Concrete slump is generally known to affect the consistency flowability pumpability compactibility and harshness of a concrete mix. Hence an accurate prediction of this property is a practical need of construction engineers. This research proposes a machine learning model for predicting

  32. Ages For Strength Testing Concrete Construction

    The curve in which compressive strength is plotted against age is generally of the form shown in the figure. As can be seen enough strength has usually been attained by age 7 days to give some indication of whether the concrete is gaining strength at a satisfactory rate so 7 days is a useful age at which to test.

  33. CIP 35 Testing Compressive Strength of Concrete

    Concrete Test Specimens in the Field. For estimating the inplace concrete strength ASTM C 31 provides procedures forfieldcuredspecimens. Cylindrical specimens are tested in accordance with ASTM C 39 Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens. A test result is the average of at least two standardcured

  34. Hardened Concrete Strength

    The ideal method for determination of tensile strength of concrete is the flexural test since it matches the real life situation in RCC flexural members. Here a simply supported prismatic specimen of concrete is loaded either at the mid point or at two equidistant points from the ends (see Figure 7).

  35. IS 133111 (1992) Method of Nondestructive testing of

    measured core testing as per IS 516 1959 ‘Method of test for strength of concrete’ is more reliable. However both these methods are relatively cumbersome and the latter method may factors proper interpretation of the results calls for certain degree of expertise. up to 500 150 25 500700 .a 70 700l

  36. Effect of High Temperatures on Concrete Concrete

    High temperatures also affect the compressive strength of concrete. Above 212186 F the cement paste begins to dehydrate (loses chemically combined water of hydration) which gradually weakens the paste and pasteaggregate bond. The temperature that concrete has reached often can be determined by observing color changes in the aggregate.

  37. CONCRETE DURABILITY AS INFLUENCED BY DENSITY

    CONCRETE DURABILITY AS INFLUENCED BY DENSITY AND/OR POROSITY By Tarun R. Naik FACTORS AFFECTING CONCRETE POROSITY/DENSITY a denser concrete microstructure is produced which in turn improves concrete strength and impermeability. Therefore HRWRA is needed in production of highquality highstrength

  38. Factors Affecting Cylinder Results

    Factors Affecting Cylinder Results The quotManual of A gggg g gregate and Concrete Testin gquot included as related material in Volume 4.02 of the 2003 Annual Book of ASTM Standa rds states that the type of fracture may be of assistance in determining the cause for the compr essive strength of a tested cylin der being less than anticipated.

  39. Ultrasonic pulse velocity test for concrete SlideShare

    Dec 08 2014nbsp018332ultrasonic pulse velocity test for concrete depends on its density and its elastic properties which in turn are related to the quality and the compressive strength of the concrete. This test method is applicable to assess the uniformity and relative quality of concrete to indicate the presence of voids and cracks and to evaluate the

  40. Durability of concrete SlideShare

    Aug 27 2014nbsp018332Factors Affecting DurabilityFactors Affecting Durability Durability depends on two main factors a) The concrete system b)The service environment a) Concrete system is based on Quality and quantity of materials used and Processes involved in manufacture of concrete.

  41. Compression Test on Concrete Building Research Institute

    The different sizes and shapes of test specimen used for determining the compressive strength of concrete along with the strength modification factors are given in table below Table1 (Modification Factors on Conversion of Strength of Concrete Specimens of various Shapes Sizes)

  42. Concrete Objectives University of Memphis

    Identify the testing factors that affect measured concrete strength in the laboratory Summarize the procedure for performing a splitting tensile test in the lab Calculate tensile strength from laboratory split tension test results Explain why quotmodulus of rupturequot is not the same as quottensile strengthquot

  43. The Strength of Chapter Concrete shop.iccsafe

    Chapter 3 3.1 The Importance of Strength 3.2 Strength Level Required KINDS OF STRENGTH 3.3 Compressive Strength 3.4 Flexural Strength 3.5 Tensile Strength 3.6 Shear Torsion and Combined Stresses 3.7 Relationship of Test Strength to the Structure MEASUREMENT OF STRENGTH 3.8 JobMolded Specimens 3.9 Testing of Hardened Concrete FACTORS AFFECTING STRENGTH 3.10

  44. Air entrainment and concrete USDA

    Air entrainment and concrete batch because air content is affected by so many factors (including maximum size of coarse aggre g a t e amount of air entraining agent type strength range and 4.5 177 1.5 percent in the strength range above 4500 psi (31 megapascals).

  45. Initial and Final Setting time of Cement Effects How

    Oct 06 2017nbsp018332Factors that affect initial and final setting time of cement The fineness of cement the presence of salts in sand atmospheric conditions. For example cement requires a temperature of 27176c to complete Hydration during winters the climate is low which stops the hydration and takes a

  46. tech talk Variation in Concrete Strength Due to Cement

    ated with testing of C109 mortar strength as well as with concrete strength are not insignifi cant. When the cement is very uniform and real cement strength variations are small the testing variation is large enough to mask the variability that can be attributed to variation of the cement source. Additionally

  47. The effect of heighttothickness ratio on the

    most important material property. It is believed that the compressive strength of concrete masonry prism is influenced by the heighttothickness ratio. Also the effect of bond type on the strength of concrete masonry is not significant recommended by the Canadian standard.