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Method for measuring fracture mechanical properties of rock-SCC interface and composite test piece

A Fracture Mechanics, -SCC Technology

Inactive Publication Date: 2020-09-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The sample types adopted in the related studies all have shortcomings such as the small size of the aggregate-cementitizing material contact surface and artificial treatment of the aggregate surface.

Method used

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  • Method for measuring fracture mechanical properties of rock-SCC interface and composite test piece
  • Method for measuring fracture mechanical properties of rock-SCC interface and composite test piece
  • Method for measuring fracture mechanical properties of rock-SCC interface and composite test piece

Examples

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Effect test

preparation example Construction

[0050] In some embodiments of the present invention, the rock block-interface-SCC three-phase composite specimen is cast by the above rock block and self-compacting concrete, refer to figure 2 , the specific preparation methods include:

[0051] S1: Cut the huge rock obtained by natural blasting into rock blocks.

[0052] S2: Cut five faces of the rock block flat, cut and polish the end of the short side on any side of the sixth face, and reserve a certain area of ​​untreated natural surface as the cement interface.

[0053] In this step, the two short side faces, two long side faces and any one thickness face of the rock block are cut flat, and the end of the short side on any side of the sixth face is cut and polished, and 200mm×(120 ~200) mm untreated natural surface as the cement interface.

[0054] S3: Cut out the groove part of the test piece at the end on the other side of the sixth surface.

[0055] S4: Before pouring the sample, soak the treated stone in water unt...

Embodiment 1

[0075] In this example, the fracture height ratio of the rock block-interface-SCC three-phase composite specimen is 0.4, and the area of ​​the fracture ligament is guaranteed to be H×B=200mm×200mm, and the size of the specimen is estimated to be L×B×D=360mm ×330mm×200mm.

[0076] The preparation method of the above rock block-interface-SCC three-phase composite specimen is as follows:

[0077] S1: Cut the huge rock obtained by natural blasting into rock blocks.

[0078] S2: Cut the two short sides, two long sides and any thickness side of the rock block flat, cut and polish the end of the short side on any side of the sixth side, and keep the 200mm×200mm untreated natural The surface acts as a cemented interface.

[0079] S3: Cut out the groove part of the test piece at the end on the other side of the sixth surface.

[0080] S4: Before pouring the sample, soak the treated stones in water for 12 hours to simulate the wet environment of the stones in the rockfill concrete. ...

Embodiment 2

[0091] In this example, the wedge splitting test is used to study the fracture performance of the rock block-self-compacting concrete interface. The specific test steps are as follows:

[0092] 1. Prepare in advance:

[0093] ①Before the test starts, the knife-edge thin steel plates are symmetrically pasted on both sides of the prefabricated cracks of the specimen for subsequent clamp-type extensometer fixation;

[0094] ②Place the specimen on the support before loading, and adjust the position of the specimen so that the support-specimen-loading indenter are on the same central axis;

[0095] ③Apply a layer of lubricating oil evenly on the surface of the loading plate rollers, then install the two loading plates to the bayonet of the test piece, insert the loading frame between the two loading plates, and ensure that the wedge-shaped plate of the loading frame is stuck between the two loading plate rollers, And it is on the same central axis as the loading head;

[0096] ④...

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Abstract

The invention discloses a method for measuring I-type fracture mechanical properties of a rock-self-compacting concrete interface and a rock-interface-SCC three-phase composite test piece. The methodcomprises the steps that a rock mass-interface-SCC three-phase composite test piece with a certain area of an I-type fracture ligament area is prepared, and the I-type fracture ligament area is distributed along the interface of a rock mass and SCC; and a macroscopic fracture test is performed on the rock mass-interface-SCC three-phase composite test piece to obtain I-type fracture mechanical parameters of the interface phase. According to the method, the area of the fractured ligament area with a certain area size can be guaranteed to represent the mechanical behavior of the engineering-scalerock-fill concrete, the fractured ligament area is distributed along the interface of the rock mass and the SCC, a subsequent macroscopic fracture experiment is carried out on the test piece, and related mechanical parameters of the interface phase are obtained.

Description

technical field [0001] The invention relates to the field of engineering materials, and specifically relates to a method for measuring the mechanical properties of the I-mode fracture at the rock block-self-compacting concrete interface and a rock block-interface-SCC three-phase composite test piece. Background technique [0002] Since the particle size of the rockfill aggregate of rockfill concrete is an order of magnitude larger than that of conventional I and II graded concrete aggregates, it is difficult to conduct experimental research on the deformation mechanical properties of its prototype scale through large-scale tests, which is currently a constraint. Rockfill concrete is a key technical bottleneck in high dams and high-grade hydraulic structures. [0003] Considering the pouring method of rockfill concrete comprehensively, it can be regarded as a composite material composed of rock blocks, self-compacting concrete and the interface between them. The interface be...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N1/28
CPCG01N1/28G01N1/286G01N3/08G01N2001/2873
Inventor 黄河啸周元德任艺莎金峰
Owner TSINGHUA UNIV
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