Ultra high performance concrete composition allowing uniform distribution of reinforcing fiber, concrete slotted floor manufactured using same, and method for manufacturing same

Patent metadata

Field	Value
Publication number	US-2022135477-A1
Application number	US-202117509209-A
Country	US
Kind code	A1
Filing date	Oct 25, 2021
Priority date	Oct 30, 2020
Publication date	May 5, 2022
Grant date	—

Abstract

The present disclosure relates to a “concrete slotted floor” manufactured from an UHPC composition which exhibits superior crack resistance due to uniform distribution of reinforcing fibers even when a residing surface is located below, allows early demolding due to fast initial setting time and exhibits improved cleaning efficiency due to maximized surface water repellency, an “UHPC composition for manufacturing the same” and a “method for manufacturing a concrete slotted floor using the same”.

First claim

1 . An ultra high performance concrete composition comprising:
a cement; 10-30 parts by weight of a binder comprising a reactive powder based on 100 parts by weight of the cement; 1-10 parts by weight of a CSA cement based on 100 parts by weight of the cement; 100-130 parts by weight of an aggregate based on 100 parts by weight of the cement; 10-30 parts by weight of a filler based on 100 parts by weight of the cement; 0.1-3 parts by weight of a silicone water repellent based on 100 parts by weight of the cement; 15-30 parts by weight of mixing water based on 100 parts by weight of the cement; and 1-6 parts by weight of a high-performance water reducing agent based on 100 parts by weight of the cement, wherein a mixture of a steel fiber and an organic fiber is used as a reinforcing fiber, and the ultra high performance concrete composition exhibits a compressive strength of 100 MPa or higher.

2 . The ultra high performance concrete composition according to claim 1 , wherein the reinforcing fiber is a mixture of a steel fiber and an organic fiber with a volume ratio of 1:0.1 to 1:0.5.

3 . The ultra high performance concrete composition according to claim 1 , wherein the organic fiber used in the reinforcing fiber has a length of 5-15 mm.

4 . The ultra high performance concrete composition according to claim 1 , comprising: 20 parts by weight of mixing water, 25 parts by weight of silica fume as a binder, 110 parts by weight of sand as an aggregate, 30 parts by weight of a filler, 2.3 parts by weight of a high-performance water reducing agent, 1 part by weight of a silicone water repellent and 5 parts by weight of a CSA cement, based on 100 parts by weight of the cement,
wherein the organic fiber is a PVA fiber with a length of 6 mm; the steel fiber has a length of 20 mm; and the reinforcing fiber is a mixture of a steel fiber and a PVA fiber with a volume ratio of 1:0.3.

5 . The ultra high performance concrete composition according to claim 1 , wherein the organic fiber used in the reinforcing fiber is oiling-treated.

6 . The ultra high performance concrete composition according to claim 5 , wherein the oiling treatment of the organic fiber is performed by spraying a C 20-40 alkane-based mineral oil onto the surface of the organic fiber.

7 . A concrete slotted floor manufactured from an ultra high performance concrete composition,
wherein the ultra high performance concrete composition comprises: a cement; 10-30 parts by weight of a binder comprising a reactive powder based on 100 parts by weight of the cement; 1-10 parts by weight of a CSA cement based on 100 parts by weight of the cement; 100-130 parts by weight of an aggregate based on 100 parts by weight of the cement; 10-30 parts by weight of a filler based on 100 parts by weight of the cement; 0.1-3 parts by weight of a silicone water repellent based on 100 parts by weight of the cement; 15-30 parts by weight of mixing water based on 100 parts by weight of the cement; and 1-6 parts by weight of a high-performance water reducing agent based on 100 parts by weight of the cement, wherein a mixture of a steel fiber and an organic fiber is used as a reinforcing fiber, and the ultra high performance concrete composition exhibits a compressive strength of 100 MPa or higher.

8 . The concrete slotted floor according to claim 7 , wherein the reinforcing fiber in the ultra high performance concrete composition is a mixture of a steel fiber and an organic fiber at a volume ratio of 1:0.1 to 1:0.5.

9 . The concrete slotted floor according to claim 7 , wherein the organic fiber used in the reinforcing fiber has a length of 5-15 mm.

10 . The concrete slotted floor according to claim 7 , comprising: 20 parts by weight of mixing water, 25 parts by weight of silica fume as a binder, 110 parts by weight of sand as an aggregate, 30 parts by weight of a filler, 2.3 parts by weight of a high-performance water reducing agent, 1 part by weight of a silicone water repellent and 5 parts by weight of a CSA cement, based on 100 parts by weight of the cement,
wherein the organic fiber is a PVA fiber with a length of 6 mm; the steel fiber has a length of 20 mm; and the reinforcing fiber is a mixture of a steel fiber and a PVA fiber with a volume ratio of 1:0.3.

11 . The concrete slotted floor according to claim 7 , wherein the organic fiber used in the reinforcing fiber is oiling-treated.

12 . The concrete slotted floor according to claim 11 , wherein the oiling treatment of the organic fiber is performed by spraying a C 20-40 alkane-based mineral oil onto the surface of the organic fiber.

13 . A method for manufacturing a concrete slotted floor using an ultra high performance concrete composition,
wherein the ultra high performance concrete composition comprises: a cement; 10-30 parts by weight of a binder comprising a reactive powder based on 100 parts by weight of the cement; 1-10 parts by weight of a CSA cement based on 100 parts by weight of the cement; 100-130 parts by weight of an aggregate based on 100 parts by weight of the cement; 10-30 parts by weight of a filler based on 100 parts by weight of the cement; 0.1-3 parts by weight of a silicone water repellent based on 100 parts by weight of the cement; 15-30 parts by weight of mixing water based on 100 parts by weight of the cement; and 1-6 parts by weight of a high-performance water reducing agent based on 100 parts by weight of the cement, wherein a mixture of a steel fiber and an organic fiber is used as a reinforcing fiber, the ultra high performance concrete composition exhibits a compressive strength of 100 MPa or higher, and a concrete slotted floor is manufactured by casting the ultra high performance concrete composition in a mold such that the cast lower surface becomes a residing surface and the cast upper surface becomes a bottom surface, followed by curing and demolding.

Assignees

• Korea Inst Civil Eng & Building Tech
• Ksc Co Ltd

Inventors

• Ryu Gum-Sung
• Kim Byung-Suk
• An Gi Hong
• Koh Kyung-Taek
• Lee Nam-Kon
• Noh Han Seok
• Noh Myeong Seop

Classifications

• C04B28/065 Primary

  Calcium aluminosulfate cements, e.g. cements hydrating into ettringite · CPC title

• C04B2111/00758

  for agri-, sylvi- or piscicultural or cattle-breeding applications · CPC title

• C04B20/1025

  Fats; Fatty oils; Ester type waxes; Higher fatty acids; Derivatives thereof · CPC title

• Y02W30/91

  Use of waste materials as fillers for mortars or concrete · CPC title

• C04B20/1018

  with organic materials (pigments or dyes C04B20/1096) · CPC title