Unlock instant, AI-driven research and patent intelligence for your innovation.

Control method for inducing concrete crack

A control method and technology of concrete, applied in the field of construction engineering, to achieve the effect of high precision

Active Publication Date: 2010-09-08
JIANGSU SOBUTE NEW MATERIALS
View PDF0 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a control method for inducing concrete cracks for the defects of existing prefabricated cracks, artificially inducing different width cracks

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Control method for inducing concrete crack
  • Control method for inducing concrete crack
  • Control method for inducing concrete crack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Take the cracked plain concrete specimen with an induced crack width of 0.5 mm as an example. Place the concrete specimen (100mm×100mm×100mm in size) formed and cured for 28 days in the mold, cover it with a steel metal panel to make it contact with the mold evenly, and fix one along the two sides of the concrete specimen near the upper surface. LVDT sensor. The specific operation method is as figure 2 As shown, a steel bar with a diameter of 8mm is used here as a pad. Put the measuring rod of the LVDT on the concrete specimen, connect the LVDT to the computer, set the recording interval in the LVDT displacement measurement system in the computer to 5 seconds, and set the loading speed of the press to 25N per second. Then start the press, when the upper platen of the press is close to the split tensile fixture, adjust the mold to balance the contact, apply the load continuously and evenly, so that the pressure is evenly transmitted to the test piece through the metal...

Embodiment 2

[0021] Take the cracked steel fiber reinforced concrete specimen with an induced crack width of 0.3 mm as an example. Put the steel fiber reinforced concrete specimen (100mm×100mm×100mm in size) formed and cured for 28 days into the mold, cover it with a steel metal panel to make it contact with the mold evenly, and place the two sides of the concrete specimen close to the upper surface respectively. Fix an LVDT sensor. The specific operation method is as figure 2 As shown, a steel bar with a diameter of 8mm is used here as a pad. Put the measuring rod of the LVDT on the concrete specimen, connect the LVDT to the computer, set the recording interval in the LVDT displacement measurement system in the computer to 3 seconds, and set the loading speed of the press to 15N per second. Then start the press, when the upper platen of the press is close to the split tensile fixture, adjust the mold to balance the contact, apply the load continuously and evenly, so that the pressure i...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a control method for inducing concrete crack, which adopts a mode of slowly applying splitting loads to induce the crack, utilizes a displacement sensor to accurately measure a transverse displacement of a concrete sample and controls the width of the surface crack by the change of the transverse displacement. The crack induced by the control method is closer to the crack in the actual engineering, the width of the crack can be manually controlled and the precision is higher.

Description

technical field [0001] The invention relates to a control method for inducing concrete cracks, which is mainly used for scientific research on the influence of cracks on the performance of concrete components, and belongs to the field of construction engineering. Background technique [0002] At present, many theories and models about the durability of concrete are based on the assumption that the concrete is intact and has no cracks. A large number of engineering practices have shown that due to chemical shrinkage, drying shrinkage, autogenous shrinkage and load effects, it is difficult to avoid cracks in concrete, and erosive media will invade the interior of concrete through cracks and pore networks, thereby accelerating the deterioration of concrete performance. Therefore, it is very necessary to study the effect of cracks on the durability of concrete. Cracks are a major factor in reducing the durability and service life of concrete structures. Once cracks appear in c...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G01N1/28G01B7/02
Inventor 刘加平缪昌文张士萍田倩王育江
Owner JIANGSU SOBUTE NEW MATERIALS