US3858999A - Paved roadbed - Google Patents

Paved roadbed Download PDF

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Publication number
US3858999A
US3858999A US417081A US41708173A US3858999A US 3858999 A US3858999 A US 3858999A US 417081 A US417081 A US 417081A US 41708173 A US41708173 A US 41708173A US 3858999 A US3858999 A US 3858999A
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US
United States
Prior art keywords
layer
roadbed
sulfur
paved
inches
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US417081A
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English (en)
Inventor
Yahiko Kadono
Teruo Nakazato
Eiichi Miura
Thunekathu Kitamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eneos Corp
Original Assignee
Nippon Oil Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nippon Oil Corp filed Critical Nippon Oil Corp
Application granted granted Critical
Publication of US3858999A publication Critical patent/US3858999A/en
Anticipated expiration legal-status Critical
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C3/00—Foundations for pavings
    • E01C3/06—Methods or arrangements for protecting foundations from destructive influences of moisture, frost or vibration

Definitions

  • pavedsurfaces specifically roadbed surfaces are in general composed of an upper roadbed layer and a lower roadbed layer.
  • a top surface layer is always rolled for safety purpose. Accordingly, it may safely be. said that the upper portion ofthe bed thus rolled is substantially a kind of roadbed.
  • the invention is described in terms of a roadbed of the type both an upper and a lower roadbed layer.
  • Typical roadbed materials which have been conventionally used, are sandy soil, gravel and crushed stone. It has been a common practice to have these roadbed materials paved and rolled, so as to provide a desired roadbed.
  • conventional roadbed materials present various problems, especially under the severe weather condition.
  • frost heave phenomenon For instance, in the cold season, the roadbed becomes frozen and develops the so-called frost heave phenomenon. Particularly in the extremely cold regions, a paved surface frequently suffers frost heaves of up to 0.5m (1% feet) due to the soil freezing.
  • the conventional paved roadbed has been nevertheless accompanied with other drawbacks such as susceptibility to surface cracking, poor drainage and overall shorter life. Furthermore, the conventional paved roadbed is disadvantageous from the viewpoint of economy, because a lot of time and labor are necessary for the maintenance and repair thereof.
  • Another object of the present invention is to provide a paved roadbed which is superior in drainage and insulation so as to maintain a'road surface in good condi tion.
  • a paved roadbed is composed of a lower roadbed layer, a layer made substantially of sulfur, an upper roadbed layer and a surface layer, all of which are superposed in the order described directly or through the interposition of another layer. It is preferable that the overall thickness of the afore-said upper roadbed layer and surface layer combined be more than about 20cm (8 inches). It is preferable that the afore-said sulfur layer be positioned upwardly of the ground water-level and have a thickness of 10 to 30cm (4 to 12 inches) or thereabout.
  • a low heat conductivity The heat conductivity of sulfur is about 1/2 of that concrete and about one fourth that of stone.
  • the sulfur layer in the cold sea son, protects the lower roadbed layer from being frozen from above, due to its insulating property.
  • the present invention contemplates therefore an improvement in paved road surface, by utilizing two known but heretofore unex ploited properties of sulfur; It has been proven through experiments that the paved roadbed according to the present invention undergoes no adverse influence under the severe weather condition existing in the extremely cold regions, and no frost heaving phenomenon, with the result of a notably longer service life.
  • the roadbed comprises a lower roadbed layer 1 which consists of a roadbed base 2 formed by leveling the natural ground and an overlying layer 3 of any conventional roadbed material such as sand.
  • the layer 3 may be formed by rolling directly the roadbed base 2 without using a roadbed material.
  • a layer 4 formed substantially of sulfur Atop the lower roadbed layer there is a layer 4 formed substantially of sulfur.
  • Sulfur used therein is solid sulfur such as grainor flake-shape.
  • the sulfur layer 4 is not always percent sulfur, but may be made substantially of sulfur.
  • the sulfur layer'4 has a thickness of about 10 to 30cm (4 to 12 inches).
  • the thickness of the sulfur layer depends upon the application condition, the nature of the sulfur used, and the type of pavement to be layed.
  • a sulfur layer of a thickness less than 10 cm (about 4 inches) results in the failure of providing the intended water level interruption and insulating effect.
  • the pressure resistance CBR to the load becomes worse to lower the supporting force.
  • the pressure resistance CBR is specified in JIS-A12l0 entitled A stamping type of soil compacting test. Generally, a paved roadbed requires a CBR value of 20 orthereabout.
  • the sulfur layer 4 is positioned atop the water table or underground water level 5. Should the position of the sulfur layer be lower than the water table 5,'this results in' the failure of producing the intended waterlevel interruption and insulating effect.
  • an upper roadbed layer 6 Atop the sulfur layer 4 there is provided an upper roadbed layer 6. It is preferable that the upper roadbed layer 6 be formed of conventional roadbed material, or a material of small particles, whose particle size is determined in consideration of the particle size of the lower roadbed layer 1. This, however, is a matter not critical to the present invention.
  • a surface layer 10, v the upper surface ofwhich corresponds to the so-called road surface 1 1.
  • the various types of pavement such as asphalt pavement, macadam pavement, concrete pavement, cinder block pavement etc. depend, therefore, upon the type of road surface ll employed.
  • the overall thickness of the surface layer 10 and upper roadbed layer 6 should be more than cm. (about 8 inches) With a total thickness of both layers less than 20cm (about 8 inches), there arises a problem in the pressure resistance CBR, as described.
  • a paved roa'dbed comprising: a lower roadbed layer; a layer formed substantially of sulfur and positioned over said lower roadbed layer; an upper roadbed layer positioned over said sulfur layer; and a surface layer positioned over said upper roadbed layer.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Structures (AREA)
  • Laminated Bodies (AREA)
US417081A 1972-11-24 1973-11-19 Paved roadbed Expired - Lifetime US3858999A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11721772A JPS5519321B2 (en:Method) 1972-11-24 1972-11-24

Publications (1)

Publication Number Publication Date
US3858999A true US3858999A (en) 1975-01-07

Family

ID=14706278

Family Applications (1)

Application Number Title Priority Date Filing Date
US417081A Expired - Lifetime US3858999A (en) 1972-11-24 1973-11-19 Paved roadbed

Country Status (7)

Country Link
US (1) US3858999A (en:Method)
JP (1) JPS5519321B2 (en:Method)
CA (1) CA998273A (en:Method)
DE (1) DE2358033A1 (en:Method)
GB (1) GB1446786A (en:Method)
NO (1) NO134386C (en:Method)
SE (1) SE387674B (en:Method)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090279952A1 (en) * 2006-08-31 2009-11-12 Friedemann Hoppe Runway for aircraft and roadway for vehicles and method of renewing a runway or roadway

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103255694B (zh) * 2013-06-06 2015-09-30 中铁二院工程集团有限责任公司 季节性冻土地区无砟轨道高速铁路路堑基床结构
CN106205351A (zh) * 2016-08-26 2016-12-07 江苏建筑职业技术学院 混凝土路面构造模型及制作方法
CN107142794B (zh) * 2016-11-14 2018-12-28 中国铁路总公司 铁路路基建造方法

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US517823A (en) * 1894-04-03 Martin t
US773276A (en) * 1903-04-15 1904-10-25 Erik Vilhelm Clausen Material for use as substitute for linoleum.
US785396A (en) * 1904-07-22 1905-03-21 Joseph Hay Amies Bituminous or other pitch concrete pavement.
US954692A (en) * 1909-03-27 1910-04-12 Henry Desborough Phillips Composition of matter for concrete.
US1507282A (en) * 1923-04-14 1924-09-02 Hammatt William Cushing Pavement
US1955421A (en) * 1934-04-17 Concrete structure and method of
US2225458A (en) * 1939-04-26 1940-12-17 Edward F Murphy Game court
US2353027A (en) * 1940-05-03 1944-07-04 Standard Oil Dev Co Bituminous road pavement

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US517823A (en) * 1894-04-03 Martin t
US1955421A (en) * 1934-04-17 Concrete structure and method of
US773276A (en) * 1903-04-15 1904-10-25 Erik Vilhelm Clausen Material for use as substitute for linoleum.
US785396A (en) * 1904-07-22 1905-03-21 Joseph Hay Amies Bituminous or other pitch concrete pavement.
US954692A (en) * 1909-03-27 1910-04-12 Henry Desborough Phillips Composition of matter for concrete.
US1507282A (en) * 1923-04-14 1924-09-02 Hammatt William Cushing Pavement
US2225458A (en) * 1939-04-26 1940-12-17 Edward F Murphy Game court
US2353027A (en) * 1940-05-03 1944-07-04 Standard Oil Dev Co Bituminous road pavement

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090279952A1 (en) * 2006-08-31 2009-11-12 Friedemann Hoppe Runway for aircraft and roadway for vehicles and method of renewing a runway or roadway
US8021076B2 (en) * 2006-08-31 2011-09-20 hkc Ilackmann + Kollath Ingenieur-Consult GmbH Runway for aircraft and roadway for vehicles and method of renewing a runway or roadway

Also Published As

Publication number Publication date
NO134386C (en:Method) 1976-09-29
DE2358033A1 (de) 1974-06-06
JPS4976317A (en:Method) 1974-07-23
JPS5519321B2 (en:Method) 1980-05-26
NO134386B (en:Method) 1976-06-21
SE387674B (sv) 1976-09-13
CA998273A (en) 1976-10-12
GB1446786A (en) 1976-08-18

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