Reactive powder concrete for reinforcing buildings as well as preparation method and construction method thereof

Abstract

The invention discloses a reactive powder concrete for reinforcing buildings as well as a preparation method and the construction method thereof. The reactive powder concrete comprises the following raw material constituents in parts by weight: 50 to 80 parts of cement, 15 to 40 parts of fly ash microsphere, 5 to 13 parts of silica fume, 35 to 80 parts of river sand, 20 to 65 parts of quartz sand, 10 to 20 parts of water, 10 to 30 parts of steel fibre and 1 to 2 parts of chemical additive. The reactive powder concrete has the advantages of good fluidity, strong plasticity, good cohesive property with an existing structure, similar linear expansion coefficient with an existing concrete structure, high strength, wide raw material source, reliable technology, durable service, low in cost and simple construction technology. In addition, the RPC material poured at later stage and the existing structure are closely integrated as a whole, resulting from contraction performance of the reactive powder concrete during the process of hardening, and the integrity of the structure is enhanced; all that is needed is to carry out conventional maintenance on the reactive powder concrete after forming, the prospective reinforcement effect can be achieved, and curing condition is the same as that of the normal premixed concrete.

Description

Technical field [0001] The invention relates to a preparation and construction method of active powder concrete for building reinforcement. Background technique [0002] As a structural system with the fastest technological development and the most widely used in the construction field of the 20th century, concrete building structure needs to be reinforced and repaired during its life cycle due to various reasons to maintain the safety of the structure and the normal performance of its functions. In developed countries in Europe and America, the current investment in building reinforcement and renovation has accounted for more than 1 / 2 of the country's total investment in the construction industry. The U.S. Department of Labor once predicted in an industry forecast report at the end of the 20th century: the building maintenance and reinforcement industry will be one of the hottest industries in the 21st century. [0003] Since the founding of the People’s Republic of my country, ...

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Problems solved by technology

[0007] The invention provides an active powder concrete for building reinforcement and its preparation and construction method. It is necessary to solve the technical problems of high cost of existing building reinforcement and reconstruction technology, difficulty in organically integrating reinforcement materials with reinforcement objects, and easy fall-off during use.

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