Non destructive testing in concrete linkedin slideshare. The assignment tis based off of the apple 10k from 2015 and i have no idea where to. Rebound hammer test is done to find out the compressive strength of concrete by using rebound hammer as per is. Suppose that each test decides between the same null hypothesis h 0. The surface of hardened concrete is struck with the hammer, and concrete compressive strength is estimated via the surface hardness rebound value. Operation procedure for phillips xl30 esem the esem will be left in the on state when not in use. Schmidt hammer, type n supports the following standards.
Astm c805, standard test method for rebound number of hardened concrete, summarizes the procedure as a steel hammer impacts, with a predetermined. Pdf rebound hammer test method statement rusi sumdaram. The concrete test hammer is a mechanical device used. Rebound hammer test is conducted around all the points of observation on all accessible faces of the structural element. To do this, the schmidt hammer is tested against the steel test anvil which has a brinell hardness number of about 5000mpa. This type of concrete has become increasingly important as it is used in columns of highrise buildings where both strength and durability are important considerations. Nondestructive concrete tests sclerometer schmidt hammer. Garden guides how to calculate swiss hammer readings.
Always hold the rebound hammer with both hands perpendicular to the surface. Around each point of observation, six readings of rebound indices are taken and average of these. For convenience, assume that the sample size for each hypothesis test is the same, n. If you have a financial responsibility agreement form on file in the nmr center, then it is applicable to all nmr instruments and computers in the center.
Procedure for schmidt hammer test or rebound hammer test. The test that a manager can use to determine whether a firm should undertake an acquisition involves two componentsa betteroff test and an ownership test. Part 202, isoidis8045, env 206, igjt 232001 the original schmidt hammer, type n, is designed for nondestructive testing of concrete items 4 100mm or more in thickness, or concrete with a maximum particle size less than or equal to 1. This procedure is recommended in all guidelines and relevant international standards. Concrete surfaces are thoroughly cleaned before taking any measurement. Field tests 1 to examine the consistency and repeatability of the schmidt hammer when used on a rock exposure and 2 to ascertain the best procedure for recording rebound values are described. Then the compressive strength was ascertained on a pressure testing machine. Rebound hammer test is a nondestructive testing method of concrete which provide a convenient and rapid indication of the compressive strength of the concrete. The specimens were placed in the schmidt hammer test is the most commonly used one in testing machine and slight load 7 nmm2 was applied figure 1. Additional details and plan summaries can be found in the benefit plan documents. The strength estimation of concrete on the basis of its surface hardness dates back more than 100 years 1. The swiss hammer test is also known as the rebound hammer.
Proper use of the rebound hammer updated to reflect the. The test results in the report only apply to the tested sample. Gilsons full line of schmidt test hammers consist of the original schmidt, silver schmidt. This type of concrete has become increasingly important as it is used in columns of highrise buildings where.
Glp procedure of these balances is a report from calibration process of the balance, and this information has unchangeable shape no modification. The chamber will be at high vacuum, filament on, stage at home position, vac and ht buttons lit, and monitor turned off. Hammer properly serviced and calibrated or verified. I need to come up with audit programs for 2 sections of this assignment.
Friedman aligned ranks test the friedman test is a nonparametric statistical test similar to the parametric repeated measures anova and it is used to detect differences in. Standard test method for rebound number of hardened concrete. Is the industry profitable or capable of being profitable. If these conditions are not met, make note of it in the log book. Test report no kesrft0004 page 4 of 72 this report shall not be reproduced except in full, without the written approval of kes co. In each test, at least 10 test hammer impacts were performed on one. Operating instructions precision and analytical balances mlt. Proceq invented the original schmidt, the worlds first and now most widely used test hammer for analyzing the compressive strength of concrete properties. Review of the rebound hammer method estimating concrete. The selection of the internal standards and their concentrations is highly dependent on analytical task, sample matrix and accuracy required. Eut description equipment under test wifi module model name wizfi250. Type n schmidt test hammer live the type n hammer is designed for. Apply a gradual increase in pressure until the hammer impacts.
A wellcontrolled procedure used to obtain data in order to describe a phenomenon. Developed in 1948 by a swiss engineer named ernst schmidt, the device measures the hardness of concrete surfaces. Rebound hammer test on concrete principle, procedure. Estimating the strength of concrete using surface rebound.
Calibration and reliability of the rebound schmidt hammer test. This method describes a procedure for using a splitbarrel sampier to obtain representative sampies of soil for identification purposes and other laboratory tests, and to obtain a measure of the resistance of the soil to penetration of the. Clean the surface of concrete, ensure the concrete is clean and dirt free. Sep 19, 2014 procedure should be tested against the test anvil. Operating principle of the rebound hammer physical principle the test hammer rebound hammer is intended to measure the surface hardness of concrete and there is an. All bsi british standards available online in electronic and print formats. Friedman test and bergmannhommel post hoc procedure. Concrete test hammer original schmidt the quality of concrete is mainly judged by its compressive strength directly affecting the loadbearing capacity and durability of concrete structures. A comparative study of schmidt hammer test methods for. Astm c805 c805m 18 standard test method for rebound. The automatic control valve signals, flow rates at the downstream and upstream ends of the test pvc pipe section, and pressures at six locations along the test section during the accident are presented, analyzed and discussed in detail.
And this process of creating an orthonormal basis is called the gramschmidt process. Device measuring direction applications weight original schmidt hammer impact direction perpendicular to the surface used for the nondestructive measurement of the concretemortar compressive strength characteristics 900 g silver schmidt hammer independent of impact direction suitable for testing a wide variety of concrete, mortar. The rebound values r of the sample cubes were measured using the concrete test hammer. So i can replace this guy with y4 and then i would normalize y4. The method for estimating the compressive strength of concrete by nondestructive testing was as follows. Two opposite faces of the cubes were prepared for the schmidt hammer among the available nondestructive methods, the test when drying was completed. The underlying principle of the rebound hammer test is. The rebound hammer is also called as schmidt hammer that consist of a spring controlled mass that slides on a plunger within a tubular housing. For nondestructive measuring of hardened concrete with compressive strengths of 10 to 70nm square. However, determination of the schmidt hardness r in laboratory conditions is sometimes very difficult for weak rocks due to the fact that samples can be broken during the test, as well. The schmidt hammer is being widely used for estimating the uniaxial compressive strength ucs of rocks because of its simplicity, rapidity and portability.
If i do v5, i do the process over and over and over again. Many types of concrete parts are tested and proceqs silverschmidt in particular allows them to test high performance concrete hpc parts. Test is a dynamic penetration test defined by the astmd 1586, bs 77 and din 4094 german standard. The rebound hammer has been around since the late 1940s and today is a commonly used method for estimating the compressive strength of inplace concrete. Proceq silverschmidt electronic concrete test hammer combines the best of the original schmidt hammer with full electronic function for a maintenancefree, lightweight concrete hammer. Before starting the procedure calibration of the hammer is required. Analytical balances asb series are offered with following capacities. Uk test report and is identical with the one tested and certified al baseefa, uk shall be furnished with each equipment 6. Exact calculations of average power for the benjamini. Rebound hammer test schmidt hammer testing on concrete. Rebound value l mean rebound value l ia mean rebound value l i. Hm75 original schmidt concrete test hammer is the classic rebound hammer known for its accuracy, repeatability, and longevity.
This easytouse instrument provides a quick and simple test for obtaining an immediate indication of concrete strength in various parts of a structure. Perform a few test impacts with the concrete test hammer on this smooth, hard sur face before taking any measurements which you are going to evaluate. The schmidt hammer method devised by schmidt is the most common. This report aims to explain the application of the friedman aligned ranks test and the bergmannhommel post hoc procedure according to garcia and herrera 2008 version. The automatic control valve signals, flow rates at the downstream and upstream ends of the test pvc pipe section, and pressures at six locations along the test section during the accident are presented. May 16, 2014 the schmidt hammer is being widely used for estimating the uniaxial compressive strength ucs of rocks because of its simplicity, rapidity and portability. As a rule, for the purity testing of water and reagents only in used as internal standard in. This additional information is to help you understand what was done throughout the test and is for your reference. A sdvosb service disabled veteran owned small business. The customer shall be supplied the copy of u1is letter, an extract of the conditions and maintenance schedule, if any recommended by baseefa, uk in their test reports and copy of instructions bookl. Betonprufhammer bedienungsanleitung sclerometre a beton nnr.
The concrete test hammer invented by ernst schmidt and introduced by proceq at the beginning of the 1950s remains to this day the most. It provides a rapid, nondestructive method of quickly assessing the condition of concrete structures. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Sep 21, 2017 the swiss hammer test is the most common nondestructive test used for measuring insitu compressive strength of concrete. Jp2007017386a measured value correction method and test. Nondestructive concrete tests sclerometer schmidt hammer measurement report type of construction date name of element schmidt hammer type age of concrete range of rebound from the anvil relative humidity of concrete position angle. Pdf the schmidt hammer in rock material characterization. And this process of creating an orthonormal basis is called the gram schmidt process. This device is universally used because of a hardened steel hammerimpacted on the concrete by a spring. An insitu test is a test performed in place not in a laboratory setting such as a bridge deck, bedrock or a concrete floor slab. Precision and analytical balances user manual msts 30240546j 732019 7. Schmittsussman enterprises summary of benefits this is a brief overview of benefits and does not cover all restrictions.
Learn vocabulary, terms, and more with flashcards, games, and other study tools. Water hammer and column separation due to accidental. Failure to use the concrete test hammer in accordance. Its a team assignment and not going well as the sam has not really cooperated. Assessing the likely compressive strength of concrete. The present invention relates to a method for correcting a measured value in concrete hardness measurement using a rebound hammer, and a test anvil holding device. Operating instructions precision and analytical balances msts. The schmidt hammer has been used to compare the surface rebound hardness of rocks, from which the uniaxial compressive strength can be estimated. This handout outlines the proper procedure for performing the entire consolidation test.