摘要:
Provided in one embodiment is a method of charactering a fly ash composition, comprising determining a reactivity of the fly ash composition in a solution. The applicability of the findings to low water-to-solid ratios for the process of geopolymerization for the relationship between the amounts of fly ash reacted, and the compressive strength of a geopolymer cement is also described.
摘要:
Design optimization methods can be used to design concrete mixtures having optimized properties, including desired strength and slump at minimal cost. The design optimization methods use a computer-implemented process that is able to design and virtually “test” millions of hypothetical concrete compositions using mathematical algorithms that interrelate a number of variables that affect strength, slump, cost and other desired features. The design optimization procedure utilizes a constant K (or K factor) within Feret's strength equation that varies (e.g., logarithmically) with concrete strength for any given set of raw material inputs and processing equipment. That means that the binding efficiency or effectiveness of hydraulic cement increases with increasing concentration so long as the concrete remains optimized. The knowledge of how the K factor varies with binding efficiency and strength is a powerful tool that can be applied in multiple circumstances. A concrete manufacturing process may include accurately measuring the raw materials to minimize variation between predicted and actual strength, as well as carefully controlling water content throughout the manufacturing and delivery process.
摘要:
The present invention relates to a thickened aqueous solution, or gel solution, for use in providing fiber to a cement composition. Additionally, the present invention relates to a method for adding fibers to cement.
摘要:
The present invention provides improved traceable well cement compositions and methods. The compositions are basically comprised of hydraulic cement, sufficient water to form a pumpable slurry and a normally non-radioactive tracer compound which becomes radioactive and emits detectible rays over a relatively short time period when exposed to neutrons. The methods of the invention relate to cementing a zone in a well and subsequently detecting the subterranean location of the cement composition therein. A traceable well cement composition of the invention is formed and introduced into a subterranean zone to be cemented. Neutrons are then emitted from a source in the well so that the tracer compound emits detectible rays, the rays are detected and the location of the cement composition in the well is determined.
摘要:
A composition and process for identifying the origin or quality of loose, pourable materials by mixing the materials with one or more marking bodies which have a color, consistency or other visibly identifiable property different from the pourable materials. The marking bodies in the mixture do not impair the intended use of the pourable materials. The origin or quality of the pourable materials can be identified at a point in time distant from the forming of the mixture and even after manufacturing article with the mixture. The pourable materials can be peat, compost, humus, clay, lava, pumice-stone, sand, fertilizers, soil stabilizers, soil improving substances, recycled soil substances, soil drainage substances and soil fillers.
摘要:
A METHOD FOR DETERMINING THE DISTRIBUTION OF AN ADDITIVE IN THE DRY INGREDIENTS OF AN OIL WELL CEMENTING COMPOSITION WHEREIN A TRACER DYE IS BLENDED WITH THE ADDITVE AND THE ADDITIVE IS BLENDED WITH THE REMAINDER OF THE CEMENT COMPOSITION, A TEST SAMPLE OF THE TOTAL MIX BEING THEN MIXED WITH A LIQUID TO DISSOLVE THE SYE AND A SPECTRO-
PHOTOMETRIC ANALYSIS IS MADE TO DETERMINE THE PERCENTAGE OF THE DYE AND THUS THE ADDITIVE IN THE CEMENT MIX.
摘要:
The present disclosure discloses a method for compression casting concrete to reduce the amount of cement, including: adopting any existing concrete mix proportion designed for concrete of given strength, mixing the concrete, pouring the concrete into a mould, and compressing the concrete at a given pressure, where 28-day strength of the compacted concrete is increased; gradually reducing the amount of cement while keeping the amounts of other materials unchanged, where 28-day strength of the concrete is gradually reduced until the concrete meets a design index; proportionally reducing amounts of water and cement in a last mix proportion while keeping the amounts of other materials unchanged, where during compression casting of the concrete, discharge of cement paste is gradually reduced until no cement paste is discharged; and compression casting a concrete member according to a final mix proportion.
摘要:
Concrete can be one of the most durable building materials where consumption is projected to reach approximately 40 billion tons in 2017 alone. Despite this the testing of concrete at all stages of its life cycle is still in its infancy although testing for corrosion is well established. Further many of the tests today are time consuming, expensive, and provide results only after it has been poured and set. Accordingly, by exploiting self-contained wireless sensor devices, which are deployed with the wet concrete, the in-situ curing and maturity measurement data can be established and employed together with batch specific concrete data to provide rapid initial tests and evolving performance data regarding the concrete cure, performance, corrosion of concrete at different points in its life cycle. Such sensors remove subjectivity, allow for rapid assessment, are integrable to the construction process, and provided full life cycle assessment.
摘要:
The invention comprises a method of forming a concrete structure or object. The method comprises detecting the temperature of a quantity of curing concrete and selectively adding heat to the curing concrete, so that the temperature of the curing concrete follows a predetermined temperature profile during at least a portion of the concrete curing process. Apparatus for performing the method is also disclosed.
摘要:
At least one of these or other problems is reduced using a building material that is uniquely identifiable. A method of making an identifiable gypsum-based building product includes selecting a tagging material occurring naturally in a component of the building material and choosing a carrier substance having a high concentration of the tagging material. By selecting an amount of the carrier substance and adding it to the building material, a building product having a unique product characteristic is created. In a second embodiment of the invention, a second tagging material is combined with the first tagging material to create a unique product. In yet another embodiment of the invention, a supplemental amount of the tagging material is added to the gypsum-based composition in addition to the carrier substance. Some tagging materials are useful in a gypsum-based composition to produce a visual confirmation of the presence of the tagging material.