Method for determining performance of high-fluidity concrete in tunnel lining

Abstract

The invention belongs to the technical field of concrete testing, and discloses a method for determining the performance of high-fluidity concrete in a tunnel lining. The method comprises the following steps: measuring the meaning and slump value of medium-high-fluidity concrete, measuring the slump expansion value, measuring the expansion time, and comparing the measured test result with a prepared standard value to judge the working performance of the medium-high fluidity concrete. The method for evaluating medium-high-fluidity concrete in the tunnel lining facilitates improvement of the compactness of a tunnel lining vault and scientific and objective evaluation of the workability of the concrete, makes the mixed medium-high-fluidity concrete adapt to the construction characteristics and economic requirements of the tunnel, and provides reference and foundation bases for engineering projects needing to meet the economic and high-quality requirements at the same time in the future.

Description

technical field [0001] The invention belongs to the technical field of concrete testing, in particular to a method for measuring the performance of high fluidity concrete in tunnel lining. Background technique [0002] In recent years, super-high-strength concrete has appeared in terms of the strength of concrete mixtures, and super-fluid concrete and high-fluidity concrete have also appeared in terms of fluidity, that is, super-fluid concrete and high-fluidity concrete are mixtures that collapse. Concrete with a slump value greater than 200mm. At present, superfluid concrete is mainly used in pile foundation engineering, and high-fluid concrete is mainly used in high-rise buildings, bridges, underground diaphragm walls, large and complex thin-walled structures and concrete-filled steel tube structures. The strength of superfluid concrete has appeared above 150MPa in the world, and there is also concrete with C100 strength grade in China. Generally, concrete with a strength...

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Problems solved by technology

[0014] (1) Since there is no precedent for using medium-high fluidity concrete for tunnel lining construction before, and the existing test methods for the working performance of tunnel lining concrete cannot fully reflect the performance of medium-high fluidity concrete, in order to use medium-high fluidity concrete for construction of tunnels, To carry out effective lining quality control, it is necessary to carry out in-depth and detailed research on the fluidity evaluation index of tunnel lining concrete

[0015] (2) Tunnel lining projects are often difficult to achieve the required work performance and work due to factors such as poor pumpability of pumped concrete, insufficient vibration, poor concrete dispersion, large strength fluctuations, internal reinforcement density, and restrictions on formwork work windows. Spend

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