US3779085A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means and method of testing expansive concrete
Assignee: Individual
•
Filing: 1972-07-24
•
Granted: 1973-12-18
•
Expires: 1992-07-24
Abstract
Abstract A method of testing expansive concrete wherein a sample of concrete is permitted to expand while subjected to a predetermined restraint, and subsequently to contract, measurements being made of the expansion and contraction. The means of testing expansive concrete comprising a split cylinder which receives a test sample of concrete contained in a pair of plastic bags having low friction characteristics. A measuring device indicates the amount of expansion and contraction occurring in the cylinder.
Inventors
- 👤 E Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:31
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/38; G01N33/383; G01B; G01B5/00; G01B5/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
107 words
A means for testing a specimen of material which is initially in a semi-fluid state and which undergoes change in volume in the course of conversion into a predetermined solid state, said means comprising: a. a circumferentially expansible and contractible cylinder for receiving a specimen of said material; b. means exerting a force tending to constrict the cylinder; c. means for measuring the change in circumferential dimension of the cylinder in conformity with change in the circumferential dimension of the specimen material; d. and a flexible and yieldable container disposed within the cylinder to receive a specimen of said material in sufficient volume to fill the cylinder.
Claim 2
Dependent Claim
107 words
A means for testing a specimen of material which is initially in a semi-fluid state and which undergoes change in volume in the course of conversion into a predetermined solid state, said means comprising: a. a circumferentially expansible and contractible cylinder for receiving a specimen of said material; b. means exerting a force tending to constrict the cylinder; c. means for measuring the change in circumferential dimension of the cylinder in conformity with change in the circumferential dimension of the specimen material; d. and a flexible and yieldable container disposed within the cylinder to receive a specimen of said material in sufficient volume to fill the cylinder.
Claim 3
Dependent Claim
35 words
A testing means as definEd in claim 1, wherein: a. the walls of the container are divided by a split and are biased to exert a constricting force and thereby constitute the force exerting means.
Claim 4
Dependent Claim
41 words
A testing means as defined in claim 1, wherein: a. the walls of the cylinder are split axially to permit expansion and contraction; b. and yieldable connector means join the two sides of the split to form said force exerting means.
Claim 5
Dependent Claim
30 words
A testing means as defined in claim 1, wherein: a. the container includes two relatively slidable laminations to facilitate low friction relative movement between the specimen material and the cylinder.
Claim 6
Dependent Claim
115 words
A means for testing a sample of expansible cementitious material as the specimen material passes from its semi-fluid initial state to its cured state, said means comprising: a. a split cylinder open at its axial ends to permit change in the volume defined by the cylinder; b. a flexible and yieldable container formed of plastic material having a low coefficient of friction and dimensioned to fit within the cylinder to receive a sample of specimen material whereby the specimen material completely fills the cylinder; c. and means for measuring change in the circumference of the cylinder thereby to determine change in volume of the cylinder in response to change in volume of the specimen material.
Claim 7
Dependent Claim
115 words
A means for testing a sample of expansible cementitious material as the specimen material passes from its semi-fluid initial state to its cured state, said means comprising: a. a split cylinder open at its axial ends to permit change in the volume defined by the cylinder; b. a flexible and yieldable container formed of plastic material having a low coefficient of friction and dimensioned to fit within the cylinder to receive a sample of specimen material whereby the specimen material completely fills the cylinder; c. and means for measuring change in the circumference of the cylinder thereby to determine change in volume of the cylinder in response to change in volume of the specimen material.
Claim 8
Dependent Claim
32 words
A testing means as defined in claim 5, wherein: a. the walls of the cylinder offer a predetermined resistance to expansion thereby applying a predetermined resistance to expansion of the specimen material.
Claim 9
Dependent Claim
52 words
A testing means as defined in claim 5, wherein: a. the margins of the cylinder at opposite sides of the split are joined by yieldable connecting means including a spring exerting a predetermined force tending to constrict the cylinder thereby to apply a predetermined force on the specimen material opposing expansion thereof.
Claim 10
Dependent Claim
36 words
A testing means as defined in claim 5, wherein: a. the container includes two relatively slidable bag members having a low coefficient of friction to minimize friction loss during change in dimension of the specimen material.
Claim 11
Independent Claim
123 words
A method of testing a specimen of a cementitious mixture containing an expansion agent beginning with the specimen in a semi-fluid condition and terminating with the specimen in a cured condition, the method characterized by: a. molding the specimen, while in its semi-fluid state, into an essentially cylindrical shape, and circumferentially confining the specimen to such shape until the specimen is cured, while axial ends of the specimen remain unconfined; b. applying a predetermined constrictive force to the circumference of the specimen yieldably opposing any radial expansion of the specimen incidental to increase in volume of the specimen and yieldably complying with any radial contraction thereof that may occur; c. and periodically measuring a dimension change related to volumetric change in the specimen.
Claim 12
Independent Claim
123 words
A method of testing a specimen of a cementitious mixture containing an expansion agent beginning with the specimen in a semi-fluid condition and terminating with the specimen in a cured condition, the method characterized by: a. molding the specimen, while in its semi-fluid state, into an essentially cylindrical shape, and circumferentially confining the specimen to such shape until the specimen is cured, while axial ends of the specimen remain unconfined; b. applying a predetermined constrictive force to the circumference of the specimen yieldably opposing any radial expansion of the specimen incidental to increase in volume of the specimen and yieldably complying with any radial contraction thereof that may occur; c. and periodically measuring a dimension change related to volumetric change in the specimen.
Claim 13
Dependent Claim
105 words
A means for testing dimensional change in a sample of cementitious material as the specimen material passes from its semi-fluid initial state to its cured state, said means comprising: a. a cylindrical member open at its ends and having an axially extending slit, the cylindrical member being subject to volumetric change upon change in the width of said slit; b. a flexible and yieldable container disposed within the cylindrical member to receive a said specimen material in sufficient volume to fill the container; c. and means for measuring change in the width of said slit in response to expansion and contraction of said specimen material.
Claim 14
Dependent Claim
105 words
A means for testing dimensional change in a sample of cementitious material as the specimen material passes from its semi-fluid initial state to its cured state, said means comprising: a. a cylindrical member open at its ends and having an axially extending slit, the cylindrical member being subject to volumetric change upon change in the width of said slit; b. a flexible and yieldable container disposed within the cylindrical member to receive a said specimen material in sufficient volume to fill the container; c. and means for measuring change in the width of said slit in response to expansion and contraction of said specimen material.
References Cited (Backward Citations)
US2637907A
Cited
US3619463A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |