43 results about "Mixture designs" patented technology

Disclosed are wax emulsion modifiers for concrete and cement formulations and methods for preparing the same. The modifiers are applicable to roller compacted concrete (RCC), used for manufacturing of industrial floor slabs, dams and roads. This invention also relates to conventional Portland cement concrete mix designs or other applied concrete mixes for formed structural shapes and transport road mix designs, providing a more rapid dehydration of the aqueous phase, without sacrificing strength, yet providing a higher density that remains workable at the point of application. The modifier of the invention may be utilized for either the initial soil / cement base or for the final / finished placement.

The invention relates to a method for determining mineral aggregate gradation by using three control points hyperbolic structure. The method comprises the following steps of: (1) determining the following three control points according to the properties of a mixture: nominal maximum particle size of the mixture and pass rate thereof, nominal minimum particle size of the mixture and pass rate thereof, and coarse / fine aggregate discontinuous point nominal particle size and pass rate thereof; (2) making a coarse aggregate gradation curve and a fine aggregate gradation curve by selecting power function models, exponential function models and logarithmic function models respectively; and (3) measuring tamping density and tamped mineral aggregate clearance rate of the mixture, and adopting coarse aggregate gradation and fine aggregate gradation respectively according to construction needs. The method can select reasonable gradation forms according to the requirements for asphalt mixture design, can also selectively construct different gradation curve forms according to the characteristics of mixtures from different material sources in different areas, gives full play to performances and characteristics of mineral aggregates in the mixture, and is significant in guiding mixture design.

Disclosed are wax emulsion compositions for curing or sealing concrete and cement formulations, methods for preparing and processes for using the same. The modifiers are applicable to curing or sealing membranes, used in roadways, highways, parking lots and other freshly placed or poured concrete surfaces to retain moisture and achieve high compressive strengths. This invention also relates to materials used to coat, spray, brush, roll etc. on conventional Portland cement concrete mix designs or other applied concrete mixes in formed structural shapes and transport road mix designs, providing an effective layer that controls and minimizes moisture loss from the mix to enable proper curing and achievement of desired compressive strengths. The compositions of the invention further provide for concrete and cement formulations having lower water soluble chloride content.

The invention discloses a design method of an AC-25 asphalt mixture. The design method adopts a vertical vibration method and comprises the steps of raw material selection and testing, design of mineral aggregate gradation, determination of the optimal asphalt-aggregate ratio, detection of performances and the like. Experimental verification indicates that the asphalt mixture designed by the method has good pavement performance, is little in amount of asphalt and is simple and convenient to operate, and the asphalt can be saved by 8-10%.

The invention discloses stable type finished warm-mixing rubber modified asphalt and a preparation method thereof. The modified asphalt comprises the following components in percentage by mass: 76-84% of matrix asphalt, 0.5-5% of modifier, 16-22% of waste rubber powder, 0.5-3% of stabilizer, 1-8% of toughener and 0.1-10% of warm mixing agent. According to the stable type finished warm-mixing rubber modified asphalt, the storage stability (especially high-temperature storage stability) of the modified rubber asphalt is improved through the mixture design, so that the modified asphalt is suitable for construction at a high / low temperature and especially suitable for construction in winter, high-temperature viscosity reduction and low-temperature viscosity increase; and the preparation process of the stable type finished warm-mixing rubber modified asphalt does not need special equipment, and is simple to operate, low in manufacturing cost and suitable for large-scale construction use.

A concrete mix having sand, fine aggregates, binder, fibers, and various admixtures is provided. The mix has a consistency from S2 to SF3, a compressive strength in the range of 30-80 MPa and a ductility represented by fc, ffl, fR1 and fR3 values, wherein the concrete mix contains at least 390 Kg of binder, the concrete mix has a paste volume of 300-600 liters, the concrete mix contains at least two systems of fibers and a general admixture system that is composed of at least 2 sub-admixture systems.

The present invention belongs to the technical field of road engineering, and particularly relates to a design method of a modified asphalt mixture for areas having different temperature difference. The design method comprises: determining the annual temperature difference of areas, selecting the type of an asphalt mixture; selecting and testing raw materials, carrying out grading design on mineral aggregate, determining an oil-stone ratio, preparing a modified asphalt mixture, inspecting the cooling performance and the road performance, determining the thermal change point and the cold change point, and evaluating the modified asphalt mixture according to the thermal change point and the cold change point. With the design method of the present invention, the difference of the pavement temperature diseases in different areas in our country can be effectively solved, the quantitative index can be provided for the evaluation of the high temperature stability and the low temperature crack resistance, the modified asphalt mixture with characteristics of high temperature road performance improving and low temperature crack resistance enhancing can be developed, and the high engineering practice value is provided.

The invention discloses a design method for an ATB-25 asphalt mixture. The method adopts a vertical vibration method. The method comprises steps of raw material selection and measurement, mineral aggregate gradation design, optimal asphalt-aggregate ratio determination, performance examination, and the like. Tests show that the asphalt mixture designed by the method has advantages of good pavement performance, reduced asphalt amount and operation convenience, and 8%-10% of the asphalt can be saved.