The diameter of the core specimen for the determination of compressive strength in load bearing structural members shall be at least 3. The use of rebound hammer alone is not suitable to the test was performed according to bs 1881. To overcome this problem cstr 11,19767 has allowed the use of 50mm and 75mm diameter cores. With the iso17025 accreditation, teca has a laboratory that ranks among the most wellmanaged and technically advanced in brunei. Pdf to estimate the compressive strength of concrete is necessary in many reinforced concrete structures.
In accordance with bs 1881 1996 specimen and apparatus details oven i. The cylindricity tolerancefor moulded cylindrical specimens shall be 2. The same standard specifies the use of 150mm or 100mm cores. Specification for compression testing machines for concrete bs 1881105. Part 116, method for determination of compressive strength of cores, british standards institution, london, u. The diameter of the core is not taken into consideration in these standards.
The test is carried out using a metal mould in the shape of a conical frustum known as a slump cone or abrams cone, that is open at both ends and has attached handles. Part 202, recommendations for surface hardness testing by rebound hammer, british standards. We are confident that we are able to handle your geotechnical and environmental laboratory testing needs. Next article bs en 123903 2009 testing hardened concrete part 3, compressive strength. Selected specimens could be any part of the structural components from the collapsed buildings, which seem not to have been adversely affected by the collapse. Compressive strength test on concrete core calculation.
These available standards include bs 1881 part 120 astm c42. Cores with hd ratio less than 1 yield unreliable results and bs 1881. Part 122, method for determination of water absorption, british standards institution, london, u. Part 5, methods of testing hardened concrete for other than strength, british standards institution, london, u. All bsi british standards are available online in pdf or hardcopy. Vertically drilled specimens have been shown stronger than horizontally drilled specimens by about 8% concrete society 1987. Construction materials al hotystanger laboratories. Other properties which can be measured is also given in this paper. Quantification of benefits of steel fiber reinforcement for rigid pavement. In 1954 proceq sa was founded and has been producing the original schmidt rebound hammers since then, without any.
The government of the hong kong special administrative region. Measurethe asreceivedor saturated density of the specimens by the method described in bs 1881. Aug 31, 2015 buy your official copy of bs 1881 124. Absorption test isat as prescribed in bs 1881 part 5. The concrete specimens were water cured for 30 days before subjected to the test. Part 120, method for determination of compressive strength of concrete cubes, british standards institution, london, u. However, cores as small as 50mm are also permitted in the standards. The fileopen plugin works with adobe reader and other viewers. Method for making and curing nofines test cubes bs 1881109. Method for determination of the compressive strength of concrete cores.
Water absorption for water absorption test, 100 mm cubes are use and tested in accordance to bs 1881122. Effects of sugar on physical properties of ordinary. For concrete with nominal maximum size of aggregate greater than or equal to 1. In order to read a secure pdf, you will need to install the fileopen plugin on your computer. Pdf effect of age on concrete core strength results. Concrete, by nature, is a nonuniform, nonisotropic structural material consisting of aggregate particles, air voids and moisture distributed heterogeneously in a hardened matrix. Pdf pull off test to evaluate the compressive strength of concrete. Part 208 st623 03 july 2006 04 august 2006 good 230c in accordance with bs 1881. Part 9 1990 insitu density and moisture content nuclear method bs 77. Part 207 determination of rapid chloride permeability aashto t277 determination of water permeability din 1048 determination of acid or alkali reaction astm d543 determination of impact resistance iso 6272 determination of shore a hardness astm d2240. Part 208 st623 03 july 2006 04 august 2006 good 230c in accordance with bs 1881 1996 specimen and apparatus details oven i. Part 120 1983 have published correction factors to an equivalent lengthdiameter ratio of 2. The government of the hong kong special administrative.
Determination of water absorption of concrete specimens cored from a structure or precast component. Types of rebound hammers several hundred thousands of schmidt rebound hammers are in uses worldwide baumann, 2006. Three cubes were cast for each mix parameter and crushed at maturity in accordance with bs en 123902 bsi 2003. Society for testing and materials astm and british standards bs give correction factors for different ld ratios of lower than 2 annual book of astm standards, astm c 4290, 1994. The concrete specimens were oven dried to constant mass at 1055oc and stored in airtight container prior to testing. Bs 1881 testing concrete civil engineering community. Pdf determination of concrete strength by core test. Recommendations for the assessment of concrete strength by neartosurface tests, british standards.
Pucinotti universita mediterranea di reggio calabria, dipartimento patrimonio architettura urbanistica, via melissari 89124 reggio calabri, italy email raffaele. Part estimate and predict the strength of concrete. Strength assessment of concrete structures universiti teknologi. Put bs 1881 in the search bar for document number, it is the last one listed in page 5 of the search results. The frequency of pulse vibration used for this work is 50 khz. Experimental study of core diameter varing hd ratio on. All bsi british standards available online in electronic and print formats.
The tool typically has an internal diameter of 100 millimetres 3. Method for making test beams from fresh concrete bs 1881111. Part 120, method for determination of compressive strength of concrete cubes, british standards. Volume 1 generally covers site operations, including methods of sampling fresh concrete, testing of fresh concrete and making and curing test specimens.
Concrete defects inspection and diagnosis springerlink. Curing of the cubes was done in compliance with british standards institution bs en 123902 bsi 2003 requirements. Pdf concrete strength by combined nondestructive methods. The test is carried out in accordance with bs 1881201 and bs 1881203 1986b. The examination and compression testing of cores cut from hardened concrete is a well established method, enabling visual inspection of the interior regions of a member to be coupled with strength estimation. Compression test is carried out at a rate within the range 1224 nmm 2min. To get a standard for free you will need to get it from someone who has it, which generally breaches the license agreement for buying the standard.
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