Concrete multi-factors durability experimental device under bent tension stress and environment coupled action
An experimental device and concrete technology, applied in the direction of applying a stable bending force to test the strength of materials, material inspection products, etc., can solve the problems of low control precision of stress wrench, change of bolt friction coefficient, occupying test space, etc., and achieve accurate test results Reliable, uniform and accurate force, and simple force application method
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[0036] Example 1:
[0037] Concrete mix ratio (kg / m 3 ): Cement-275, fly ash-183, sand-705, gravel-1127, water-160, polycarboxylic acid superplasticizer-3.2
[0038] According to the above ratio, after mixing with a forced mixer, pour the fresh concrete into a steel mold with a size of 70mm×70mm×280mm, vibrate the shaker for 30s, leave it in the laboratory for 24h and demould, and then remove the concrete sample Put it into a standard curing room (temperature (20±3°C, relative humidity above 90%)) to cure to the specified age and then take it out. Use the MTS810 testing machine to conduct four-point bending strength test on the cured concrete specimen, and pass the control during the experiment The loading rate is 0.01mm / s. In the four-point bending test, the center span of the lower bottom surface is 210mm, and the span of the upper surface fulcrum is 70mm. According to the measured bending strength, 0.20, 0.35, 0.50, 0.65, 0.80 are applied to the concrete specimens. Two stress l...
Example Embodiment
[0039] Example 2:
[0040] Concrete mix ratio (kg / m 3 ): Cement-275, fly ash-183, sand-705, gravel-1127, water-160, polycarboxylic acid superplasticizer-3.2
[0041] According to the above ratio, after mixing with a forced mixer, pour the fresh concrete into a steel mold with a size of 70mm×70mm×280mm, vibrate the shaker for 30s, leave it in the laboratory for 24h and demould, and then remove the concrete sample Put it into a standard curing room (temperature (20±3°C, relative humidity above 90%)) to cure to the specified age and then take it out. Use the MTS810 testing machine to conduct four-point bending strength test on the cured concrete specimen, and pass the control during the experiment The loading rate is 0.01mm / s. In the four-point bending test, the center span of the lower bottom surface is 210mm, and the span of the upper surface fulcrum is 70mm. According to the measured bending strength, 0.20, 0.35, 0.50, 0.65, 0.80 are applied to the concrete specimens. A stress lev...
Example Embodiment
[0042] Example 3:
[0043] Concrete mix ratio (kg / m 3 ): Cement-275, fly ash-183, sand-705, gravel-1127, water-160, polycarboxylic acid superplasticizer-3.2
[0044] According to the above ratio, after mixing with a forced mixer, pour the fresh concrete into a steel mold with a size of 70mm×70mm×280mm, vibrate the shaker for 30s, leave it in the laboratory for 24h and demould, and then remove the concrete sample Put it into a standard curing room (temperature (20±3°C, relative humidity above 90%)) to cure to the specified age and then take it out. Use the MTS810 testing machine to conduct four-point bending strength test on the cured concrete specimen, and pass the control during the experiment The loading rate is 0.01mm / s. In the four-point bending test, the center span of the lower bottom surface is 210mm, and the span of the upper surface fulcrum is 70mm. According to the measured bending strength, 0.20, 0.35, 0.50, 0.65, 0.80 are applied to the concrete specimens. A stress lev...
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