SU789739A1 - Method of determining lightweight-concrete strength - Google Patents

Method of determining lightweight-concrete strength Download PDF

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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
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SU
USSR - Soviet Union
Prior art keywords
determining
lightweight
strength
concrete
concrete strength
Prior art date
Application number
SU782699280A
Other languages
Russian (ru)
Inventor
Леонид Александрович Козак
Валерий Михайлович Кабыш
Original Assignee
Рижский Ордена Трудового Красного Знамени Политехнический Институт
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Priority to SU782699280A priority Critical patent/SU789739A1/en
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Publication of SU789739A1 publication Critical patent/SU789739A1/en

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2291/00Indexing codes associated with group G01N29/00
    • G01N2291/02Indexing codes associated with the analysed material
    • G01N2291/028Material parameters
    • G01N2291/02827Elastic parameters, strength or force

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  • 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)

1.Лещинский М. Ю. и Скрамтаев Б. Г. Испытание прочности бетона, М., Строительна  промышленность , 1973, с.71.1. Leshchinsky M. Yu. And Skramtaev B. G. Testing the strength of concrete, M., Building industry, 1973, p.71. 2.З спресо-информаци . Силикатные строительные материалы, 1966, М 18, с. 2-9 (прототип).2. 3 spare information. Silicate building materials, 1966, M 18, p. 2-9 (prototype).
SU782699280A 1978-12-20 1978-12-20 Method of determining lightweight-concrete strength SU789739A1 (en)

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

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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

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SU (1) SU789739A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
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

Cited By (1)

* Cited by examiner, † Cited by third party
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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