Method and device for evaluating static stability of self-compacting concrete with closed mold cavity of slab ballastless track

Abstract

The invention relates to a method and device for evaluating the static stability of self-compacting concrete with a closed mold cavity of a slab ballastless track. The test steps of the method are as follows: 1) loading the self-compacting concrete mixture from the middle hole 1; 2) putting the mixture in Free flow on the bottom plate 2; 3) When the entire mold cavity 3 is filled, the mixture rises from the observation hole 4 to a certain height; 4) Stop pouring when the height of the mixture in the pouring hole 1 is consistent with the height of the observation hole; 5) After standing still for 15 minutes, use a needle penetration meter 5 of specified size and quality to test the penetration depth of the observation hole and the perfusion hole; 6) test the penetration of the observation hole 4 and the difference between the penetration of the observation hole 4 and the perfusion hole 1; 7) After the self-compacting concrete has finally set, split the concrete in the pouring hole and the observation hole, and measure the distance between the coarse aggregate and the upper top surface. The invention truly simulates the flow state of the self-compacting concrete in the closed mold cavity of the slab-type ballastless track during the pouring process, and has the characteristics of convenient operation, high testing precision, and application in the field.

Description

Technical field: [0001] The invention belongs to the technical field of testing of building materials, and in particular relates to a method and device for evaluating the static stability of self-compacting concrete with a closed mold cavity of a slab ballastless track, which is suitable for evaluating the static stability of self-compacting concrete and high-fluidity concrete, especially Evaluation of the stability of self-compacting concrete used in closed mold cavities of CRTS II slab ballastless track and CRTS III slab ballastless track of high-speed railway. Background technique: [0002] Realizing the self-filling and self-compacting functions of structures with the intelligent power of concrete materials is a major technological revolution that uses material properties to solve structural durability problems caused by construction factors. As a typical representative of intelligent dynamic concrete, self-compacting concrete has been applied to the CRTS III slab ballas...

AI Technical Summary

Problems solved by technology

The fourth category is other methods, other methods include conductivity method, immersion test method, etc., but these methods are mostly in the research stage and have not been applied in actual engineering

At present, there are the following problems in the evaluation of the static stability of self-compacting concrete: first, the influence of external force factors on the stability of self-compacting concrete mixture is not considered; second, the flow state of self-compacting concrete in the solid structure and the state when it reaches stability are not considered ; The third is the lack of evaluation of the stability of self-compacting concrete under the condition of closed mold cavity of slab ballastless track

Images