FIELD: measuring.
SUBSTANCE: invention relates to methods of investigating properties of construction materials. Disclosed is a method of determining the grade of concrete by frost resistance, which includes making an even number of control samples of concrete with a notch over the entire width of the sample in the lower zone; maintenance of control samples to brand age under normal conditions; water saturation of control samples in three consecutive stages; testing the first half of the samples to determine the stress intensity factor Kc before freezing; freezing the second half of the samples to a temperature of -50 °C followed by thawing; testing the second half of the reference samples to determine the stress intensity factor Kc(f) after one freezing cycle; calculation of stress intensity factor change; calculation of concrete grade by frost resistance.
EFFECT: invention provides rapid determination of the grade of concrete by frost resistance for control samples that are of grade age.
1 cl, 1 dwg, 1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD OF PREPARATION OF CONCRETE MIX | 2001 |
|
RU2185348C1 |
| CONCRETE MIXTURE | 2015 |
|
RU2606147C1 |
| METHOD TO MAKE CONCRETE MIX | 2009 |
|
RU2416582C1 |
| HIGH-RANGE WATER REDUCER | 2007 |
|
RU2357937C1 |
| COMPOSITE RAW MIX FOR THE PRODUCTION OF FIBER-REINFORCED CONCRETE | 2021 |
|
RU2770375C1 |
| SELF-COMPACTING CONCRETE MIXTURE | 2016 |
|
RU2632795C1 |
| COMPOSITION FOR HEAT INSULATION OF BUILDING STRUCTURES | 2012 |
|
RU2525536C2 |
| FAST-ACTING CONCRETE MIXTURE FOR REPAIRING BUILDING CONSTRUCTIONS | 2012 |
|
RU2522588C2 |
| HIGH-STRENGTH POWDER-ACTIVATED CONCRETE | 2020 |
|
RU2743909C1 |
| BINDER | 0 |
|
SU1047859A1 |
