T0560-2005Test method for splitting tensile strength of cement concrete cube

1Purpose, scope of application, and reference standards

This method specifies the test method for splitting tensile strength of cement concrete cube specimens

This method is applicable to cubic specimens of various types of cement concrete.

Reference standards

Test Method for Compressive Strength of Cement Concrete(T0553

Method for on-site sampling of cement concrete specimens and hardened cement concrete(T055

2Instruments and materials

21Press or universal testing machine:should comply withT0553Chinese2.1The regulations

22Splitting steel cushion strip and plywood cushion layer(Or fiberboard cushion layer),As shown in the figureT0560-1As shown. The top surface of the steel cushion strip has a radius75mmarc,The length shall not be less than the edge length of the specimen. The width of the wooden plywood or hard fiberboard cushion layer is20mm,thick3-4mm,The length shall not be less than the length of the specimen,The cushion layer shall not be reused.

2.3steel ruler:The division value ismm

imageT05601Steel cushion strip for splitting test(unit of measurement:mm)

1upper pressure plate;2Lower pressure plate;3Whole layer:4layering

3Preparation and maintenance of test specimens

31The size of the test piece should comply withT051Middle tableT0551The regulations.

32This specimen should be of the same age as1group,Each group is3Concrete test blocks made and cured under the same conditions

4Experimental steps

41At the experimental age,Remove the specimen from the standard and protective chamber,Cover with a damp cloth,Avoid changes in humidity. Check the appearance and mark the position line of the splitting surface in the middle of the specimen,The splitting surface is perpendicular to the top surface of the specimen during molding,Accurate measurement of dimensionsImm

42Place the test piece on the ball seat,Geometric alignment,Place the cushion layer and strip properly,Its direction is perpendicular to the top surface of the specimen during molding

43When the strength grade of concrete is less thanC30time,The loading speed is0.02-0.05MPas:When the strength grade of the concrete is greater than or equal toC30And less thanC6time,The loading speed is05-08MPas:When the strength grade of concrete is greater than or equal toC60time,The loading speed is08-010MPasWhen the specimen approaches failure and begins to rapidly deform,Do not adjust the throttle of the testing machine,Until the specimen is destroyed,Record the ultimate load of failureF.

5Result Calculation

5lConcrete cube splitting tensile strength,According to the formula(T05601)calculatef===0.637(T0560-1in the formula:f—Concrete cube splitting tensile strength(MPa)F—ultimate load(N)A—Splitting surface area of the specimen(mm2),The cross-sectional area of the specimen. The result calculation is accurate to00IMPa

52The arithmetic mean of the measured values of three specimens is taken as the measured value,The result is accurate to001MPaIf one of the maximum or minimum values measured by the three specimens differs from the median value by more than the median value15%,Then take the middle value as the measured value:If the difference between the maximum and minimum values and the median value exceeds the median value15%,The experimental results of this group are invalid.

6The test report should include the following contents

(1)Name and execution standards of the required testing items

(2)Variety, specifications, and place of origin of raw materials;

(3)Test date and time

(4)Name, model and number of the instrument and equipment

(5)Environmental temperature and humidity

(6)Splitting tensile strength value of cubic specimens

(7)Other content to be explained.

provisions explanation:

This method refers toSO4108preparation,Due to difficulties in aligning the test box through direct stretching,So indirect stretching method is adopted(Crack stretching)The tensile strength of Deke clay concrete,Generally, its splitting strength is higher than its direct tensile strength