Slump cone and method for testing working performance of self-compacting concrete

Abstract

A slump cone comprises a slump cone body and a reinforcing steel bar grid. The slump cone body is a big-end-down tower-shaped cylinder 1.5 mm thick. Handles are arranged on the two sides of the outer wall of the cylinder. The reinforcing steel bar grid is fixed to the bottom of the slump cone body. Reinforcing steel bars are ribbed reinforcing steel bars or plain round bars with diameter of 12 mm and clear spacing of 41 mm or 59 mm. A method for testing the working performance of self-compacting concrete through the slump cone includes the steps of adding a stirred self-compacting concrete mixture into the slump cone body, rapidly and vertically lifting the slump cone body to the position about 300 mm high, observing the state of concrete after the concrete passes through the reinforcing steel bar grid, evaluating the mobility through the expansion degree SF, evaluating the gap passing performance through completely-out-of-cylinder time TF and ovality delta, and evaluating the segregation resistance through the visual stability index method VSI. The slump cone is simple in structure and convenient and rapid to use; through a single test, the mobility, gap passing performance and segregation resistance of the self-compacting concrete can be tested at the same time.

Description

technical field [0001] The invention belongs to the field of building materials, in particular to a self-compacting concrete workability testing device and testing method. Background technique [0002] At present, self-compacting concrete (SCC for short) is a new type of high-performance concrete. As the name suggests, self-compacting concrete can fill the formwork voids through steel bars only by its own weight. In order to achieve the expected performance, self-compacting concrete has high requirements for workability. The workability of self-compacting concrete mixtures is divided into three aspects: fluidity, gap passage and segregation resistance. There are corresponding test methods for the performance of the three aspects. The fluidity is generally measured by slump expansion and T 50 For testing, the gap passability is generally tested by J ring, L-shaped box and other methods, and the segregation resistance is tested by sieve analysis test and visual stability inde...

AI Technical Summary

Problems solved by technology

Each test method can basically only reflect a certain aspect of the workability of self-compacting concrete, and cannot fully cover the three aspects of the workability of self-compacting concrete. Two or three test methods must be used to compare the workability of self-compacting concrete. Comprehensive Testing and Evaluation

This is not only time-consuming and labor-inte

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