A Feasibility Test Method of Self-compacting Concrete Mix Ratio for Nuclear Engineering
A technology of self-compacting concrete and test methods, applied in the direction of material inspection products, etc., can solve the problems that self-compacting concrete properties cannot be fully unified, the amount of concrete mixing is small, and production cannot be well guided
Active Publication Date: 2016-08-03
CHINA NUCLEAR IND 24 CONSTR
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Problems solved by technology
[0003] The trial mix test and performance test of the existing self-compacting concrete mix ratio are completed in the laboratory. The test conditions in the laboratory are quite different from the production and construction conditions. The amount of concrete mixing in the laboratory is small, and the test equipment and production construction equipment There is a big difference, the performance of self-compacting concrete cannot be fully unified, and it cannot be a good guide for production
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Embodiment Construction
[0027] The technical solutions of the present invention will be described in detail below in conjunction with specific embodiments.
[0028] This technical solution mainly uses steel pipes, and the prepared steel cage is placed in the steel pipes, and the funnel and PVC pipes are used as auxiliary work to assist grouting, and a special operation platform is built to pour self-compacting concrete. After the concrete is hardened, the combination between the concrete and the steel pipe wall is detected by the concrete ultrasonic testing method, and the steel pipe is cut open to cut the concrete column horizontally, and the surface and interior of the concrete are observed, as well as the condition of the steel pipe.
[0029] The secondary grouting area of the volute pump in the PX pump room of Fujian Fuqing Nuclear Power Plant Units 1 and 2 has the characteristics of narrow ring shape, large grouting volume but narrow operating space, dense steel bars, and local spiral top seal,...
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Abstract
The invention belongs to the technical field of nuclear power engineering construction, and in particular relates to a feasible test method for the mixing ratio of nuclear engineering self-compacting concrete. It includes the following steps: (1) Preparation before the test; (2) Self-compacting concrete mixing, using a forced concrete mixer to continuously mix in batches, and pouring in steel pipes after meeting the preset requirements; (3) Self-compacting concrete Concrete pouring; when pouring concrete filled steel pipe, at least one set of cubic compressive strength test blocks shall be formed at the same time, and the compressive strength test shall be carried out after 28 days of standard curing; (4) curing of self-compacting concrete; (5) performance testing of hardened concrete, using steps (3 ) to test the hardness of the self-compacting concrete in the steel pipe after hardening. When the hardness obtained by the test reaches 70% of the design value, observe and record the combination between the concrete and the steel pipe wall; at the same time, conduct ultrasonic testing on the steel pipe concrete Inspection to detect the bonding between the concrete and the inner wall of the steel pipe.
Description
technical field [0001] The invention belongs to the technical field of nuclear power engineering construction, and in particular relates to a feasible test method for the mixing ratio of nuclear engineering self-compacting concrete. Background technique [0002] The feasibility test of the mix ratio is an indispensable link between the mix ratio trial stage in the laboratory and the production and construction stage. At present, self-compacting concrete is more and more used in engineering because of its excellent fluidity and filling properties. widely. The working performance of self-compacting concrete is mainly controlled and evaluated through the following items: concrete mixture slump expansion degree, T500, J ring test, V-shaped funnel test, U-shaped box test, anti-segregation test, etc. The main performance of hardened concrete is compressive strength. These tests have tested the self-compacting performance of self-compacting concrete very well, but because the tes...
Claims
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IPC IPC(8): G01N33/38
Inventor 路进学伍崇明祁珲周玲刘向荣秦大贵
Owner CHINA NUCLEAR IND 24 CONSTR