Luminescent concrete composition and product

Patent metadata

Field	Value
Publication number	US-2020109089-A1
Application number	US-201816151994-A
Country	US
Kind code	A1
Filing date	Oct 4, 2018
Priority date	Oct 4, 2018
Publication date	Apr 9, 2020
Grant date	—

Abstract

Luminescent concrete compositions containing cement, fine aggregates such as sand, and a phosphor such as strontium aluminate. Glow-in-the-dark concrete products made therefrom and methods of producing such concrete products are also specified. The glow-in-the-dark concrete products demonstrate good mechanical strength (e.g. compressive strength) and skid resistance. The addition of phosphorescent strontium aluminate provides luminance that persists for up to 10 hours to the concrete products.

First claim

1 : A luminescent concrete composition, comprising:
a hydraulic cement; a fine aggregate comprising sand; and phosphorescent strontium aluminate particles, wherein: a weight ratio of the strontium aluminate particles to the fine aggregate is in the range of 1:2 to 1:20: and the luminescent concrete composition is devoid of a superplasticizer.

2 : The luminescent concrete composition of claim 1 , wherein the phosphorescent strontium aluminate particles comprise a rare earth element doped strontium aluminate.

3 : The luminescent concrete composition of claim 2 , wherein the rare earth element is at least one selected from the group consisting of cerium, dysprosium, europium, and neodymium.

4 : The luminescent concrete composition of claim 3 , wherein the rare earth element doped strontium aluminate further comprises a promoter selected from the group consisting of boron, lithium, sodium, potassium, magnesium, calcium, barium, chromium, and manganese.

5 : The luminescent concrete composition of claim 1 , wherein the phosphorescent strontium aluminate particles have an average particle size of 1-15 μm.

6 : The luminescent concrete composition of claim 1 , wherein the sand has a bulk specific gravity of 2.2-2.8, and a water absorption of 0.2%-1.0%.

7 : The luminescent concrete composition of claim 1 , which has a weight percentage of the fine aggregate ranging from 35-60 wt % relative to a total weight of the luminescent concrete composition.

8 : The luminescent concrete composition of claim 1 , wherein the hydraulic cement is an ordinary Portland cement.

9 : The luminescent concrete composition of claim 1 , which has a weight percentage of the hydraulic cement ranging from 30-60 wt % relative to a total weight of the luminescent concrete composition.

10 : The luminescent concrete composition of claim 1 , consisting essentially of:
the hydraulic cement; the fine aggregate comprising sand; and the phosphorescent strontium aluminate particles, wherein a weight ratio of the strontium aluminate particles to the fine aggregate is in the range of 1:2 to 1:20.

11 : A luminescent concrete slurry, comprising:
the luminescent concrete composition of claim 1 ; and 10-25 wt % water relative to a total weight of the luminescent concrete slurry.

12 : A glow-in-the-dark concrete block, comprising:
a surface layer comprising a cured form of the luminescent concrete slurry of claim 11 ; and a base concrete block, wherein at least a portion of a surface of the base concrete block is coated by the surface layer.

13 : The glow-in-the-dark concrete block of claim 12 , wherein the surface layer has a thickness of 1-20 mm, and wherein a thickness ratio of the surface layer to the base concrete block is in the range of 0.02:1 to 0.2:1.

14 : The glow-in-the-dark concrete block of claim 12 , wherein the base concrete block comprises a cured form of a concrete slurry comprising cement, a fine aggregate comprising sand, a coarse aggregate comprising limestone, and water, and which is devoid of phosphorescent strontium aluminate particles.

15 : The glow-in-the-dark concrete block of claim 14 , wherein the limestone has an average particle size of 2-15 mm, a bulk specific gravity of 2.0-3.0, and a water absorption of 1.0%-3.0%.

16 : The glow-in-the-dark concrete block of claim 12 , which has an intensity of glow of 2-15 candelas per square meter for a period of 0.1-10 hours upon excitation with sun light at an intensity of 50-300 watts for 2-20 minutes.

17 : The glow-in-the-dark concrete block of claim 12 , which has a compressive strength of 43-50 MPa according to ASTM C9361/C936M.

18 : The glow-in-the-dark concrete block of claim 12 , wherein the surface layer has a skid resistance value of 100-150.

19 : The glow-in-the-dark concrete block of claim 12 , wherein a volume of the base concrete block is greater than that of the surface layer.

20 : A luminescent concrete material, comprising a cured form of the luminescent concrete slurry of claim 11 .

Assignees

• Univ Imam Abdulrahman Bin Faisal

Inventors

• Saleem Muhammad
• Blaisi Nawaf Isam Ahmed

Classifications

• C04B2111/807

  Luminescent or fluorescent materials · CPC title

• C04B28/04

  Portland cements · CPC title

• C09K11/77

  containing rare earth metals · CPC title

• C04B2111/1006

  Absence of well-defined organic compounds · CPC title

• C09K11/02 Primary

  Use of particular materials as binders, particle coatings or suspension media therefor · CPC title