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A technique for reinjecting grout into an insufficiently grout portion of a prestressed concrete structure is provided. A poorly grout filled portion of a prestressed concrete structure is identified, and through holes 20, 30, and 40 are drilled from the outside of the

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Introduction

Reinforced concrete is an indispensable product of technical construction. One of the major discoveries in engineering construction in the 20th century is pre-stressed concrete. It is widely applied in most advanced countries in the world for over 50 years. In Vietnam, the appliion of concrete technology tensioning is done from the past 70’s, 80’s.

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For prestressed concrete construction, the current standard for buildings is BS8110 and for bridges BS5400, which suggest an initial prestressing force of 70% of the characteristic failing load. For ties and similar appliions in structural steel construction, the requirements of BS5950: Parts 1 and 2 apply.

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