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Reflective concrete body, process for the manufacture and utilization of the same

Assignee: Institut fur Privatwirtschaft Gschwend and Stadler
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Filing: 1979-01-05
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Granted: 1980-08-19
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Expires: 1999-01-05
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Abstract

Abstract In a road surface and a process for making same, a top layer of reflex reflective concrete in slab or cylindrical form is made of a mixture of white Portland cement, particulate white quartz filler material, colorless crystal balls and titanium dioxide pigment. The quartz filler is a trigonal trapezohedrical β-quartz powder having a refractive index of 1.55 and a particle size less than the glass ball diameters, the latter being from 0.2 to 0.6 mm. The glass balls constitute from 50 to 70% of the mixture and are arranged within the top layer of concrete in successive layers with those balls closest to the impact surface of the top layer being half exposed to intercept light from car headlamps.

Inventors

  • 👤 Heinrich Metzler

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 09:41
CPC Classifications
B; B28; B28B; B28B11/00; B28B11/08; B28B11/0872; C; C04; C04B; C04B14/00; C04B14/02; C04B14/04; C04B14/22; C04B41/00; C04B41/53; C04B41/5323; E; E01; E01F; E01F9/00; E01F9/50; E01F9/506; E01F9/553

Claims Analysis

Total Claims: 14
Claim 1
Independent Claim 110 words
In a road surface having a top layer of reflex reflective concrete comprising a mixture of cement, hard filler material, glass balls and pigment, the improvement wherein: (a) said cement is white Portland cement; (b) said hard filler material is particulate white quartz of particle size smaller than that of said glass balls; (c) said glass balls are colorless crystal glass balls comprising from 50 to 70% of said mixture and being arranged in a plurality of layers within said top layer of said road surface, the balls of the uppermost of said plurality of layers being exposed approximately to half their diameters; and (d) said pigment is titanium dioxide.
Claim 2
Dependent Claim 110 words
In a road surface having a top layer of reflex reflective concrete comprising a mixture of cement, hard filler material, glass balls and pigment, the improvement wherein: (a) said cement is white Portland cement; (b) said hard filler material is particulate white quartz of particle size smaller than that of said glass balls; (c) said glass balls are colorless crystal glass balls comprising from 50 to 70% of said mixture and being arranged in a plurality of layers within said top layer of said road surface, the balls of the uppermost of said plurality of layers being exposed approximately to half their diameters; and (d) said pigment is titanium dioxide.
Claim 3
Dependent Claim 23 words
The improvement according to claim 1 wherein said particulate white quartz is a trigonal trapezohedrical β-quartz powder having a refractive index of 1.55.
Claim 4
Dependent Claim 45 words
The improvement according to claim 2, wherein: (a) said β-quartz powder comprises from 10 to 30% of said mixture; (b) said white Portland cement comprises from 15 to 25% of said mixture; and (c) said titanium dioxide comprises from 1.5 to 4.5% of said mixture.
Claim 5
Dependent Claim 47 words
The improvement according to claim 3, wherein: (a) said colorless crystal glass balls comprise 60% of said mixture; (b) said β-quartz powder comprises 20% of said mixture; (c) said white Portland cement comprises 18% of said mixture; and (d) said titanium dioxide comprises 2% of said mixture.
Claim 6
Dependent Claim 25 words
The improvement according to claim 1, 2, 3 or 4, wherein said colorless crystal glass balls have a diameter of from 0.2 to 0.6 mm.
Claim 7
Dependent Claim 150 words
In a process for manufacturing a road surface having a top layer of reflex reflective concrete, said top layer being formed by roughly mixing cement, hard filler material, glass balls and pigment in a dry condition, adding sufficient water to the dry mixture to produce a thick wet concrete, filling a form with said wet concrete, compacting said wet concrete in the form, removing the compacted concrete from the form, allowing the removed compacted concrete to harden and thereafter treating a surface area of the hardened concrete with an acid to partially expose those glass balls which are directly adjacent said surface area, the improvement comprising the steps of using white Portland cement as said cement, white quartz particles as said hard filler material, colorless crystal glass balls in an amount of from 50 to 70% of said dry mixture as said glass balls and titanium dioxide as said pigment.
Claim 8
Dependent Claim 150 words
In a process for manufacturing a road surface having a top layer of reflex reflective concrete, said top layer being formed by roughly mixing cement, hard filler material, glass balls and pigment in a dry condition, adding sufficient water to the dry mixture to produce a thick wet concrete, filling a form with said wet concrete, compacting said wet concrete in the form, removing the compacted concrete from the form, allowing the removed compacted concrete to harden and thereafter treating a surface area of the hardened concrete with an acid to partially expose those glass balls which are directly adjacent said surface area, the improvement comprising the steps of using white Portland cement as said cement, white quartz particles as said hard filler material, colorless crystal glass balls in an amount of from 50 to 70% of said dry mixture as said glass balls and titanium dioxide as said pigment.
Claim 9
Dependent Claim 25 words
The improvement according to claim 6, wherein said white quartz particles have the trigonal trapezohedrical crystal structure of β-quartz and a refractive index of 1.55.
Claim 10
Dependent Claim 46 words
The improvement according to claim 7, wherein said white quartz particles comprise from 10 to 30% of said dry mixture, said white Portland cement comprises from 15 to 25% of said dry mixture and said titanium dioxide comprises from 1.5 to 4.5% of said dry mixture.
Claim 11
Dependent Claim 48 words
The improvement according to claim 8, wherein said colorless crystal glass balls comprise 60% of said dry mixture, said white quartz particles comprise 20% of said dry mixture, said white Portland cement comprises 18% of said dry mixture and said titanium dioxide comprises 2% of said dry mixture.
Claim 12
Dependent Claim 25 words
The improvement according to claim 6, 7, 8 or 9, wherein said colorless crystal glass balls have a diameter of from 0.2 to 0.6 mm.
Claim 13
Dependent Claim 21 words
The improvement according to claim 6, wherein said wet concrete is compressed at a pressure of about 300 kg/cm 2 .
Claim 14
Dependent Claim 20 words
The improvement according to claim 6 or 11, wherein the acid used for treating said major surface is phosphoric acid.

References Cited (Backward Citations)

US3417676A Cited
US3823021A Cited
US3964821A Cited
US4049337A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1983-08-19 1984-02-18 1984-08-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1987-08-19 1988-02-18 1988-08-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1991-08-19 1992-02-18 1992-08-19 $7700.00 Window Closed / Lapsed

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