Quality control of monolithic concrete placement in a structure with a non-removable steel-fiber concrete formwork

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Currently, permanent formwork made of high-strength steel fiber concrete (hereinafter SFB) is used in the construction of structures of nuclear power plants (hereinafter NPP). The use of reinforced formwork blocks with permanent formwork from SFB makes it possible to implement a precast-monolithic construction method, significantly increasing the speed of erection of blocks. At the same time, the use of this technology leads to problems of quality control of the laying of monolithic concrete, where it is hidden inside an armored block with permanent formwork. Experimental studies have been carried out to search for defects of various types and sizes inside the formwork block using the main methods of concrete flaw detection: through ultrasonic sounding, ultrasound tomography, radiography (georadar). Recommendations are given on ways to control the quality of monolithic concrete placement. It has been established that the most suitable method of control is ultrasound tomography, which allows to identify a defect behind a permanent steel-reinforced concrete formwork.

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Sobre autores

D. Korotkikh

Joint Stock Company “Institute Orgenergostroy”; National Research Moscow State University of Civil Engineering

Autor responsável pela correspondência
Email: mail@rifsm.ru

Doctor of Sciences (Engineering), Professor

Rússia, build. 10, 7, Derbenevskaya embankment, Moscow, 115114; 26, Yaroslavskoe Highway, Moscow, 129337

V. Dorf

Joint Stock Company “Institute Orgenergostroy”

Email: mail@rifsm.ru

Candidate of Sciences (Engineering)

Rússia, build. 10, 7, Derbenevskaya embankment, Moscow, 115114

D. Kapustin

Joint Stock Company “Institute Orgenergostroy”; National Research Moscow State University of Civil Engineering

Email: mail@rifsm.ru

Candidate of Sciences (Engineering)

Rússia, build. 10, 7, Derbenevskaya embankment, Moscow, 115114; 26, Yaroslavskoe Highway, Moscow, 129337

L. Zeid Kilani

Joint Stock Company “Institute Orgenergostroy”; National Research Moscow State University of Civil Engineering

Email: mail@rifsm.ru

Engineer 

Rússia, build. 10, 7, Derbenevskaya embankment, Moscow, 115114; 26, Yaroslavskoe Highway, Moscow, 129337

Bibliografia

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  4. AP1000 Design Control Document (rev. 18). Tier 2 Chapter 3. Design of Structures, Components, Equip. & Systems – Section 3.8 Design of Category I Structures. «Nuclear Regulatory Commission» (NRC). USA. 206 p. https://www.nrc.gov/docs/ML1034/ML103480517.pdf
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2. Fig. 1. Fragments of formwork blocks

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3. Fig. 2. The studied fragments of the formwork blocks: a – defects location scheme; b – fixation of the inserts on the inner surface of the SFRC formwork sheet; D1 – 50×50 mm; D2 – 100×10 mm; D3 – 150×150 mm; D4 – 200×200 mm; D5 – cold seam defect

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4. Fig. 3. Ultrasound propagation scheme: a – through thickness measurment; b – measurement with sensor offset; h – thickness of the fragment; И – is the ultrasound transmitter; П – is the ultrasound receiver ; d – is the size of the defect

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5. Fig. 4. Results of ultrasound velocity changes in concrete

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6. Fig. 5. Ultrasound isospids in 400 mm thick blocks aged: a – 1 day; b – 28 days

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7. Fig. 6. Ultrasound isospids in 800 mm thick blocks aged: a – 1 day; b – 28 days

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8. Fig. 7. Ultrasound scans: 1 – reinforcing bar; 2 – a defect of 5 cm in size; 3 – a defect of 20 cm in size; 4 – a section of formwork detachment

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9. Fig. 8. Results of GPR measurments: a – radiogram; b – scan profile

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