Rubber concrete product

Patent metadata

Field	Value
Publication number	US-2023139047-A1
Application number	US-201917754714-A
Country	US
Kind code	A1
Filing date	Oct 9, 2019
Priority date	Oct 9, 2019
Publication date	May 4, 2023
Grant date	—

Abstract

Disclosed is a concrete product incorporating rubber aggregate produced by casting under pressure. The concrete product may optionally be cast at 6.9-27.7 MPa for periods of, for example, 24 hours. In one embodiment the rubber aggregate may comprise coarse and/or fine rubber aggregate to replace natural sources of coarse and fine aggregate. Casting under pressure was found to generally improve the performance characteristics of the concrete when compared to corresponding concrete cast without pressure.

First claim

1 . A method of producing a cast concrete product, the method comprising:
forming a concrete slurry incorporating rubber aggregate; and casting the concrete slurry under pressure.

2 . The method according to claim 1 , comprising casting the concrete slurry at a pressure of between 2-50 MPa.

3 . The method according to claim 1 , comprising selecting a pressure under which to cast the concrete slurry based upon the amount of rubber aggregate within the concrete slurry to be cast.

4 . The method according to claim 3 , comprising selecting a pressure under which to cast the concrete so as to reduce the volume of the concrete slurry by approximately the volume of rubber aggregate within the concrete slurry prior to casting under pressure.

5 . The method according to claim 1 , wherein the rubber aggregate comprises coarse rubber aggregate.

6 . The method according to claim 5 , wherein the coarse rubber aggregate substantially complies with the grading requirements for coarse aggregate set out in ASTM C33/C33M-16.

7 . The method according to claim 5 , wherein the coarse rubber aggregate forms between 1-100% by volume of all coarse aggregate within the concrete slurry prior to casting under pressure.

8 . The method according to claim 1 , wherein the rubber aggregate comprises fine rubber aggregate.

9 . The method according to claim 8 , wherein the fine rubber aggregate substantially complies with the grading requirements for fine aggregate set out in ASTM C33/C33M-16.

10 . The method according to claim 8 , wherein the fine rubber aggregate forms between 1-100% v/v of all fine aggregate within the concrete slurry immediately prior to casting under pressure.

11 . The method according to claim 1 , wherein the concrete slurry is cast under pressure for between 3-48 hours.

12 . The method according to claim 1 , wherein pressure is sustained substantially to keep concrete volume unchanged throughout casting of the concrete slurry.

13 . The method according to claim 1 , wherein following casting the cast concrete product is further cured at atmospheric pressure, at between 15-30° C. and at 50-100% humidity for between 10-30 days.

14 . The method according to claim 1 , wherein the concrete slurry comprises Portland cement.

15 . The method according to claim 1 , wherein the rubber aggregate has not previously undergone chemical treatment to alter its surface properties.

16 . The method according to claim 1 , wherein the rubber aggregate is produced from waste materials.

17 . The method according to claim 1 , further comprising including reinforcement mesh or fibers in a mold or the slurry prior to casting.

18 . A cast concrete product produced according to the method of claim 1 .

19 . The cast concrete product according to claim 18 , wherein the cast concrete product is either: a masonry brick or block, a pre-fabricated pipe, a pre-fabricated construction beam, a pre-fabricated construction wall, or a prefabricated construction slab.

20 . The cast concrete product of claim 18 , wherein the cast concrete product is a Bessemer block.

Assignees

• Melbourne Inst Tech
• Univ Shenzhen

Inventors

• Wu Yufei
• Kazmi Syed Minhaj Saleem
• Munir Muhammad Junaid
• Zhou Yingwu

Classifications

• C04B28/04

  Portland cements · CPC title

• C04B40/0071

  making use of a rise in pressure · CPC title

• B28B3/04

  with one ram per mould (B28B3/10 takes precedence) · CPC title

• C04B14/06

  Quartz; Sand · CPC title

• B28B23/0081 Primary

  Embedding aggregates to obtain particular properties · CPC title