SU789739A1 - Method of determining lightweight-concrete strength - Google Patents
Method of determining lightweight-concrete strength Download PDFInfo
- Publication number
- SU789739A1 SU789739A1 SU782699280A SU2699280A SU789739A1 SU 789739 A1 SU789739 A1 SU 789739A1 SU 782699280 A SU782699280 A SU 782699280A SU 2699280 A SU2699280 A SU 2699280A SU 789739 A1 SU789739 A1 SU 789739A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- determining
- lightweight
- strength
- concrete
- concrete strength
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02827—Elastic parameters, strength or force
Landscapes
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Description
Изобретение относитс к неразрушаю щему контролю качества материалов и изделий и может быть использовано дл контрол качества легких бетонов. Известен способ определени прочности бетона, заключающийс в том, что ста тически вдавливают в поверхность издели штамп, измер ют получаемый отпечаток и определ ют прочность по тарировоч ным кривым в зависимости от размера отпечатка l . Однако способ .не обеспечивает достаточной точности, так как получаемы отпечатки образуютс за счет .пластичес- ксй деформации поверхностного сло . Наиболее близким по технической сущности к изобретению вл етс способ испытани прочности легких бетонов, заключающийс в том, что вдавливают штамп в бетсш и определ ют прочность по тарировочным кривым в зависимости от усили вдавливани штампа 2J. Недостаток способа - невысока точность , так как оптимальна глубина внедрени щтампа может измен тьс дл легких бетонов с различной структурой н составом, а надежность получаемых зависимостей между измер емыми параметрами и прочностью существенно падает при повышении плотности бетона, особенно на легких заполнител х. Цель изобретени повьпиение точности . Эта цель достигаетс за счет того, что в прсадессе вдавливани штампа измер ют амплитуду сигналов акустической эмиссии, а усилие вдавливани определ ют в момент достижени амплитудой заданной величины. Способ определени прочности закточаетс в следующем. На изделии устанавливают преобразователь акустической эмиссии. Начинают вдавливать штамп, измер ют при этом амплитуду сигналов акустической эмиссии и усилие вдавливани штампа. Момент сжончани испытани устанавливают по достижении амплитуды сигналов акус-The invention relates to non-destructive quality control of materials and products and can be used to control the quality of lightweight concrete. A known method for determining the strength of concrete is that a stamp is statically pressed into the surface of the product, the resulting imprint is measured, and the strength is determined by the calibration curves depending on the imprint size l. However, the method does not provide sufficient accuracy, as the resulting prints are formed due to plastic deformation of the surface layer. The closest to the technical essence of the invention is a method for testing the strength of lightweight concrete, which consists in pressing a stamp into a betsh and determining the strength according to calibration curves depending on the force of pressing a punch 2J. The disadvantage of the method is low accuracy, since the optimal depth of penetration can be varied for lightweight concrete with a different structure and composition, and the reliability of the dependences obtained between the measured parameters and strength decreases significantly with increasing density of concrete, especially for lightweight aggregates. The purpose of the invention is precision. This goal is achieved due to the fact that in a punch indentation of the die, the amplitude of the acoustic emission signals is measured, and the indentation force is determined at the moment when the amplitude reaches a predetermined value. The method for determining the strength is as follows. An acoustic emission transducer is installed on the product. The stamp is started to be pressed in, the amplitude of the acoustic emission signals and the force of the pressing of the stamp are measured. The moment of testing is established when the amplitude of the signals
тической эмвссвн заданной величины, ко торую определ ют заранее экспериментально дл к жкретного вида и состава легкого . Измер ют усилие вдавливани , в зависимости от котсршо по тарировочным кривым определ ют прочность бетона.of a given value, which is determined in advance experimentally for a specific type and composition of the lung. The force of the indentation is measured, and the strength of the concrete is determined from the calibration curves according to the calibration curves.
Исаопьзование способа обеспечивает повышение точности оценки прочности издёлий из бето й за счет доведени процесса испытаний при вдавливавии штампа до начала образовани микротрешин, непосредственно предшествующего разрушению материала.The design of the method provides an increase in the accuracy of the evaluation of the strength of the broken out of the concrete by introducing the test process when the die is pressed in before the formation of microcracks immediately preceding the destruction of the material.
Claims (2)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU782699280A SU789739A1 (en) | 1978-12-20 | 1978-12-20 | Method of determining lightweight-concrete strength |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU782699280A SU789739A1 (en) | 1978-12-20 | 1978-12-20 | Method of determining lightweight-concrete strength |
Publications (1)
Publication Number | Publication Date |
---|---|
SU789739A1 true SU789739A1 (en) | 1980-12-23 |
Family
ID=20799654
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU782699280A SU789739A1 (en) | 1978-12-20 | 1978-12-20 | Method of determining lightweight-concrete strength |
Country Status (1)
Country | Link |
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SU (1) | SU789739A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106769445A (en) * | 2016-11-25 | 2017-05-31 | 太原理工大学 | A kind of indoor static pressure perforation device for determining compression strength of building mortar |
-
1978
- 1978-12-20 SU SU782699280A patent/SU789739A1/en active
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN106769445A (en) * | 2016-11-25 | 2017-05-31 | 太原理工大学 | A kind of indoor static pressure perforation device for determining compression strength of building mortar |
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