Anti-blast concrete and method of fabricating anti-blast structure member using such anti-blast concrete

Patent metadata

Field	Value
Publication number	US-2021371336-A1
Application number	US-202017061204-A
Country	US
Kind code	A1
Filing date	Oct 1, 2020
Priority date	Jun 2, 2020
Publication date	Dec 2, 2021
Grant date	—

Abstract

An anti-blast concrete and a method of fabricating an anti-blast structure member using such anti-blast concrete are disclosed. The composition of the anti-blast concrete according to the invention includes, in parts by weight, 1.0 part by weight of cement, 1.0 to 2.5 parts by weight of fine aggregates, 1.0 to 2.5 parts by weight of coarse aggregates, and a plurality of reinforcing fibers. The weight ratio of the reinforcing fibers to the cement ranges from 0.5% to 3%. The plurality of reinforcing fibers are a plurality of carbon fibers or a plurality of aramid fibers. A test body, made of the anti-blast concrete of the invention, has an average number of times of repeated impacts at an impact energy of 49.0 Joules equal to or larger than 41 times at 28 days of age.

First claim

What is claimed is:

1 . An anti-blast concrete, in parts weight, comprising:
1.0 part by weight of a cement; 1.0 to 2.5 parts by weight of fine aggregates; 1.0 to 2.5 parts by weight of coarse aggregates; and a plurality of reinforcing fibers, wherein a weight ratio of the reinforcing fibers to the cement ranges from 0.5% to 3%, the plurality of reinforcing fibers are first dispersed, and then uniformly mixed into the cement by a dry and pre-mixing way, the plurality of reinforcing fibers are a plurality of carbon fibers or a plurality of aramid fibers, the reinforcing fibers have a length range of from 3 mm to 30 mm; wherein said anti-blast concrete is made into a test body with a water-cement ratio, the test body has an average number of times of repeated impacts at an impact energy of 49.0 Joules equal to or larger than 41 times at 28 days of age, and the water-cement ratio ranges from 0.4 to 0.6.

2 . The anti-blast concrete of claim 1 , wherein the test body has an average compressive strength equal to or larger than 33.55 MPa at 28 days of age.

3 . The anti-blast concrete of claim 2 , wherein when the test body comprises the reinforcing fibers having the length of 6 mm, the test body has the average number of times of repeated impacts at the impact energy of 49.0 Joules equal to 41 times, when the test body comprises the reinforcing fibers having the length of 12 mm, the test body has the average number of times of repeated impacts at the impact energy of 49.0 Joules equal to 146 times, when the test body comprises the reinforcing fibers having the length of 24 mm, the test body has the average number of times of repeated impacts at the impact energy of 49.0 Joules more than 2,000 times.

4 . The anti-blast concrete of claim 3 , wherein the reinforcing fibers have an average diameter range of from 6 μm to 8 μm.

5 . A method of fabricating an anti-blast structure member, comprising the steps of:
preparing 1.0 part by weight of a cement; preparing 1.0 to 2.5 parts by weight of fine aggregates; preparing 1.0 to 2.5 parts by weight of coarse aggregates; preparing a plurality of reinforcing fibers, wherein the plurality of reinforcing fibers are a plurality of first carbon fibers or a plurality of first aramid fibers, the reinforcing fibers have a length range of from 3 mm to 30 mm; placing the plurality of reinforcing fibers in a high-temperature environment for a period of time to remove impurities on the surfaces of the plurality of reinforcing fibers; by an aerodynamic and sieving process, dispersing the plurality of reinforcing fibers; by a dry and pre-mixing way, uniformly mixing the dispersed reinforcing fibers into the cement, wherein a weight ratio of the reinforcing fibers to the cement ranges from 0.5% to 3%; preparing a rebar frame; with a water-cement ratio, uniformly mixing the fine aggregates, the coarse aggregate, and the cement uniformly mixed with the reinforcing fibers into an anti-blast concrete; and pouring the anti-blast concrete into the rebar frame to finish the anti-blast structure member.

6 . The method of claim 5 , wherein the reinforcing fibers have an average diameter range of from 6 μm to 8 μm.

7 . The method of claim 6 , wherein the water-cement ratio ranges from 0.4 to 0.6.

8 . The method of claim 7 , further comprising the steps of:
preparing a reinforcing fabric, constituted by a plurality of second carbon fibers or a plurality of second aramid fibers; and attaching the reinforcing fabric on a surface of the anti-blast structure member back to blast.

Assignees

• Univ Nat Taipei Technology

Inventors

• Li Yeou-Fong

Classifications

• C04B28/02

  containing hydraulic cements other than calcium sulfates · CPC title

• C04B2111/00974

  for pyrotechnic applications, e.g. blasting · CPC title

• F41H5/24 Primary

  for stationary use, e.g. fortifications {; Shelters; Guard Booths (air-raid shelters E04H9/04)} · CPC title

• F42D5/045

  Detonation-wave absorbing or damping means · CPC title

• F42D5/00

  Safety arrangements · CPC title