Class / Patent application number | Description | Number of patent applications / Date published |
073803000 | Concrete | 15 |
20090007691 | CREEP TESTER FOR PRECISION LOAD CONTROL WITH WEIGHT - A creep tester for a precise and accurate creep test includes a movable actuator capable of loading corresponding to change in length of a specimen, a cam actuator operated in association with the movable actuator, and a self weight actuator. The movable actuator includes upper and lower spherical adjusting seats to hold upper and lower portions of the specimen, a spring disposed on the upper spherical adjusting seat to correspond to a minute deformation of the specimen, upper and lower movable tables respectively contacting the spring and the lower spherical adjusting seat, a load cell and a stationary table disposed on the upper movable table, and a movable loading table disposed below the lower movable table to apply a predetermined load to the specimen. The creep tester can perform a precise creep test by continuously applying a constant load without supplementation of hydraulic pressure. | 01-08-2009 |
20090084189 | Measuring mechanical properties - Methods of determining the mechanical properties of a sample include applying a first pressure condition to a first portion of the sample and applying a second pressure condition to the second portion of the sample, the second pressure condition being different than the first pressure condition. | 04-02-2009 |
20090173163 | Biodegradable test cylinder mold - A biodegradable test cylinder mold is used for testing concrete specimens. The mold comprises a cylindrical wall connected to a bottom wall to define a hollow, unitary cylindrical container for receiving concrete to form a test specimen. The cylindrical container is formed of a biodegradable material comprising corn starch or a blend of corn starch and plastic. | 07-09-2009 |
20100005898 | System and method for conditioning and detection of moisture damage in asphalt mixes - An apparatus and method for determination of susceptibility of asphalt concrete materials to moisture damage. An asphalt sample of known bulk specific gravity (density) is placed inside a chamber filled with water, which is capable of heating the sample to a pre-determined temperature. The chamber is pressurized by introduction of air pressure to a flexible membrane that decreases the volume within a chamber containing the sample and water, increasing the pore pressure in the sample. The pressure is then released and allowed to come to ambient pressure. This process is repeated a predetermined number of times (cycles). When a selected number of cycles are complete, the asphalt sample is removed from the chamber and its bulk specific gravity (density) measured again. The difference between the density before and after conditioning is an excellent method of rating the degree at which moisture would deteriorate asphalt samples due to introduction of moisture. The cyclic nature of the increased/decreased pore pressure is observed to significantly decrease bulk specific gravity (density) for poor quality asphalt designs. Furthermore, the sample conditioned by this method can be used for other conventional mechanical test methods, such as tensile strength and modulus determination. Computerized controls are used to automate the procedure and to record and display data from sensors. | 01-14-2010 |
20100071474 | Field Strength Test Devices and Methods for Installed Engineered Material Arresting Systems - Embodiments of the present invention provide field test devices and methods for testing the compressive gradient strength of installed vehicle arresting systems, such as those installed on airport runways. Current methods of testing such arresting systems are conducted on sample materials in-house, and these methods are not applicable or useful when tests need to be conducted on currently-installed systems in the field. | 03-25-2010 |
20100175485 | RETROFITABLE PAVEMENT STRAIN GAUGE - There is provided a proof body for use in a strain gauge for measuring horizontal strains in a pavement. The proof body is to be inserted in a hole provided in a surface layer of the pavement. The proof body is designed to be embedded in a substitute core designed to be retrofitted in the hole. The proof body is designed to be attached to the walls of the hole, allowing measurement of horizontal strains in the pavement surface layer. | 07-15-2010 |
20100307258 | METHOD AND APPARATUS FOR THE NON-DESTRUCTIVE MEASUREMENT OF THE COMPRESSIVE STRENGTH OF A SOLID - An apparatus and a method are described that determine the compressive strength of a solid by rebound. The method and apparatus have a reduced sensitivity to error sources, i.e. gravity, internal friction and operator interference (unsteady holding of the instrument). The improvements are achieved by contactless measuring of the quotient of rebound to inbound velocity recorded immediately before and after the impact. Matching the mass of the mallet ( | 12-09-2010 |
20110232394 | METHOD OF MEASURING STRESS HISTORY AND COMPOSITE MATERIAL CONTAINING CEMENT AS MAIN COMPONENT - There are provided a method by which a stress history of an object can be measured with high reliability if the object, which has temporarily been elastically deformed upon receiving an external force, recovers from the elastic deformation, and a composite material containing cement as a main component, of which a stress history can be measured with high reliability without reducing the strength of the material itself and without breaking the structure. To achieve the above-mentioned advantages, the method includes the steps of: acquiring an initial value of a twin density for calcite particles contained in an object to be measured that is elastically deformable upon receiving an external force; and measuring a history of stresses received by the object to be measured on the basis of a difference from the initial value in respect of the twin density for the calcite particles after the object to be measured receives the external force. The composite material includes calcite particles, for which a twin density is known and which are mixed to be distributed in the material, partially replacing an aggregate of the material. | 09-29-2011 |
20120103106 | GASBAG TYPE PAVEMENT ACCELERATED LOADING TESTING APPARATUS - Disclosed is a gasbag type pavement testing apparatus, comprising a main frame ( | 05-03-2012 |
20130192382 | MEASUREMENT OF PROPERTIES OF SAMPLE OF CURING COMPOSITIONS UNDER HIGH PRESSURE - A method for testing a curing composition, comprising includes a curing composition; injecting the curing composition into a mold; curing the curing composition into a cured composition, in the mold at a controlled curing pressure; measuring at least one physical or mechanical property of the cured sample at a controlled test pressure, in the mold; the mold being rigid relatively to the cured sample during the curing step. | 08-01-2013 |
20140007695 | CEMENT TESTING - Systems and methods provide for testing a cement by measuring both axial shrinkage/expansion and radial shrinkage/expansion of a sample. | 01-09-2014 |
20140174192 | APPARATUS FOR MEASURING SHEAR BOND STRENGTH OF SET CEMENT AND METHOD OF USING SAME - An apparatus for determining shear bond strength of a cement to be set within a wellbore penetrating a subterranean formation consists of a housing, a vertical rod which extends from the uppermost portion of the housing through the lowermost portion of the housing, a base plate for positioning onto the bottom of the housing and for supporting the lowermost portion of the vertical rod, and a test plate for positioning onto the top of the housing through which the uppermost portion of the vertical rod extends. The apparatus may further contain a push rod. Shear bond strength is determined by introducing into the housing a sample core of the formation prior to introduction of a slurry containing the cement. The force required to break the bond between the vertical rod and the set cement may be used to determine the shear strength between the casing within the wellbore and the set cement when the cement is hardened within the wellbore. The force required to break the bond between the set cement and the sample core may be used to determine the shear strength between the set cement and formation core when the cement is hardened within the wellbore. | 06-26-2014 |
20150346182 | Portable System and Method for Quality Assurance Testing of Asphalt Binders - A system includes a voltage supply configured to supply a drive voltage. A flexible device connects with the voltage supply. The flexible device is configured to be embedded into a material, e.g., a viscoelastic material. A strain gage connects with the flexible device, and the strain gage is configured to measure a flexing of the flexible device. A processor connects with the strain gage. The processor is configured to determine a measured strain and a phase shift between the drive voltage and the strain when voltage is supplied to the flexible device to produce a fingerprint of the material. The processor can be configured to determine G* and δ to produce a fingerprint of the material. | 12-03-2015 |
20160103114 | STRESS HISTORY MEASUREMENT METHOD AND STRESS SENSOR - It is an object to provide a stress history measurement method and a stress sensor by which the stress history of an object being measured can be measured easily with high accuracy over a vide stress measurement range. In the stress history measurement method, the stress history to which the object being measured has been subjected is measured on the basis of the ratio of twinned calcite particles after the object to be measured has been subjected to an external force, the object having a stress sensor embedded therein and capable of being deformed elastically when being subjected to the external, force, the sensor including a number of calcite particles. The stress sensor is configured such that a number of calcite particles are hardened by a resin with adjacent particles kept in contact with each other. | 04-14-2016 |
20160202232 | PULLOUT APPARATUS AND SYSTEM FOR TESTING OF ANCHOR BOLTS/BARS | 07-14-2016 |