Quantification of benefits of steel fiber reinforcement for rigid pavement. Put bs 1881 in the search bar for document number, it is the last one listed in page 5 of the search results. For concrete with nominal maximum size of aggregate greater than or equal to 1. The diameter of the core specimen for the determination of compressive strength in load bearing structural members shall be at least 3. Part 208 st623 03 july 2006 04 august 2006 good 230c in accordance with bs 1881 1996 specimen and apparatus details oven i. These available standards include bs 1881 part 120 astm c42. Part 120, method for determination of compressive strength of concrete cubes, british standards. Feb 25, 2007 put bs 1881 in the search bar for document number, it is the last one listed in page 5 of the search results. Part estimate and predict the strength of concrete.
Recommendations for the assessment of concrete strength by neartosurface tests, british standards. Part 116, method for determination of compressive strength of cores, british standards institution, london, u. Aug 31, 2015 buy your official copy of bs 1881 124. Types of rebound hammers several hundred thousands of schmidt rebound hammers are in uses worldwide baumann, 2006. The test is carried out in accordance with bs 1881201 and bs 1881203 1986b. Method for making test beams from fresh concrete bs 1881111. These available standards include bs 1881 part 120 astm. 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. Method for determination of the compressive strength of concrete cores. Concrete defects inspection and diagnosis springerlink. We are confident that we are able to handle your geotechnical and environmental laboratory testing needs. Pdf pull off test to evaluate the compressive strength of concrete.
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. 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. Three cubes were cast for each mix parameter and crushed at maturity in accordance with bs en 123902 bsi 2003. Measurethe asreceivedor saturated density of the specimens by the method described in bs 1881. Part 9 1990 insitu density and moisture content nuclear method bs 77. In accordance with bs 1881 1996 specimen and apparatus details oven i. Review of the rebound hammer method estimating concrete. Splitting tensile strength of sustainable selfconsolidating.
Pdf to estimate the compressive strength of concrete is necessary in many reinforced concrete structures. The fileopen plugin works with adobe reader and other viewers. The same standard specifies the use of 150mm or 100mm cores. The use of rebound hammer alone is not suitable to the test was performed according to bs 1881. Method for making and curing nofines test cubes bs 1881109. Effects of sugar on physical properties of ordinary. 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.
Part 208 st623 03 july 2006 04 august 2006 good 230c in accordance with bs 1881. Other properties which can be measured is also given in this paper. To overcome this problem cstr 11,19767 has allowed the use of 50mm and 75mm diameter cores. In 1954 proceq sa was founded and has been producing the original schmidt rebound hammers since then, without any. Pdf effect of age on concrete core strength results. Part 202, recommendations for surface hardness testing by rebound hammer, british standards. The frequency of pulse vibration used for this work is 50 khz. All bsi british standards available online in electronic and print formats.
In order to read a secure pdf, you will need to install the fileopen plugin on your computer. Part 5, methods of testing hardened concrete for other than strength, british standards institution, london, u. Part 122, method for determination of water absorption, british standards institution, london, u. The diameter of the core is not taken into consideration in these standards. Pdf determination of concrete strength by core test. The cylindricity tolerancefor moulded cylindrical specimens shall be 2. The government of the hong kong special administrative.
Absorption test isat as prescribed in bs 1881 part 5. Next article bs en 123903 2009 testing hardened concrete part 3, compressive strength. Pdf concrete strength by combined nondestructive methods. Vertically drilled specimens have been shown stronger than horizontally drilled specimens by about 8% concrete society 1987.
The tool typically has an internal diameter of 100 millimetres 3. Specification for compression testing machines for concrete bs 1881105. Strength assessment of concrete structures universiti teknologi. Part 120, method for determination of compressive strength of concrete cubes, british standards institution, london, u. All bsi british standards are available online in pdf or hardcopy. Compressive strength test on concrete core calculation. Volume 1 generally covers site operations, including methods of sampling fresh concrete, testing of fresh concrete and making and curing test specimens. Method for determination of compressive strength of concrete cores. Experimental study of core diameter varing hd ratio on.
Pucinotti universita mediterranea di reggio calabria, dipartimento patrimonio architettura urbanistica, via melissari 89124 reggio calabri, italy email raffaele. Water absorption for water absorption test, 100 mm cubes are use and tested in accordance to bs 1881122. Method for determination of compressive strength of. Concrete, by nature, is a nonuniform, nonisotropic structural material consisting of aggregate particles, air voids and moisture distributed heterogeneously in a hardened matrix. Construction materials al hotystanger laboratories. Bs 1881 testing concrete civil engineering community. The concrete specimens were water cured for 30 days before subjected to the test. However, cores as small as 50mm are also permitted in the standards. Compression test is carried out at a rate within the range 1224 nmm 2min. 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.
The government of the hong kong special administrative region. Cores with hd ratio less than 1 yield unreliable results and bs 1881. The concrete specimens were oven dried to constant mass at 1055oc and stored in airtight container prior to testing. Part 120 1983 have published correction factors to an equivalent lengthdiameter ratio of 2. With the iso17025 accreditation, teca has a laboratory that ranks among the most wellmanaged and technically advanced in brunei.