41results about How to "Large amount of expansion" patented technology

The invention provides a modified calcium oxide expansive agent used for cement concrete and a preparation method thereof. The modified calcium oxide expansive agent used for cement concrete comprises polyvinyl alcohol and a calcium oxide expanding clinker, wherein the surface of the calcium oxide expanding clinker is coated with polyvinyl alcohol. The modified calcium oxide expansive agent used for cement concrete has the beneficial effects that the hydration process of the calcium oxide expanding clinker can be regulated; invalid hydration at the plastic stage of concrete is reduced, the expansion quantity after hardening is increased and the shelf life of the product is prolonged; the modified calcium oxide expansive agent used for cement concrete can be used for crack and seepage resistance of a concrete structure and can substantially improve the durability of concrete.

The invention discloses a construction method for combination of water swelling sealing rod and water swelling glue, which relates to the technological field of waterproof construction. In the construction method for combination of water swelling sealing rod and glue, the water swelling sealing rod is used as a main water stopping material and the water swelling glue is used as a bonding and fixing material as well as an auxiliary water stopping material on a lap joint. At the same time, the combination of water swelling rod and water swelling glue is applied to the construction of the waterproof part in a building. The construction method for combination of swelling sealing rod and water swelling glue can be extensively applied to concrete construction joints, late poured bands, wall pipes, pile crowns in underground projects and other joints which is suitable for the waterproof method. The construction method for combination of water swelling sealing rod and water swelling glue has much more polarization and application value. Besides, the economic and social benefits of the construction method for combination of water swelling rod and water swelling glue are extremely notable.

The invention discloses a clamping mechanism suitable for a tensile strength test of a universal testing machine. The clamping mechanism comprises a clamping body; an opening of the clamping body is internally provided with a wedge-shaped clamp plate; one side, away from the clamping body, of the wedge-shaped clamp plate is provided with an inner concave part; the inner concave part is internally provided with a wedge-shaped bayonet, a wedge-shaped included angle alpha of the wedge-shaped bayonet is less than a wedge-shaped included angle beta of the wedge-shaped clamp plate, and ejector rods are arranged on the wedge-shaped clamp plate; the wedge-shaped bayonet is provided with an outer convex part; the outer convex part is in halved joint with the inner concave part of the wedge-shaped clamp plate, both ends of the inner concave part of the wedge-shaped clamp plate are each provided with a mounting groove, both ends of the outer convex part of the wedge-shaped bayonet are respectively provided with through holes which are coaxial but have different diameters, and the through holes are respectively provided with a guide rod and a spring; the guide rod is inserted into the mounting grooves of the inner concave part of the wedge-shaped clamp plate, and the wedge-shaped bayonet can slide along the guide rod. The wedge-shaped clamp plate has relatively large expansion volume and wider application scope, and a test piece is easier to clamp and disassemble; when the test piece is clamped tightly, the expansion quantity of the bayonet is small, and the self locking property is strong, so the test piece is easy to clamp and lock tightly.

The invention discloses an ultra-narrow-band optical filter with high optical stability and a preparation method thereof. The ultra-narrow-band optical filter comprises a substrate and an ultra-narrow-band optical filter film arranged on the substrate. The substrate is made of FEP optical plastic, and the ultra-narrow band filter film is of a modified three-cavity structure. The film system selects a TiO2 film with a high refractive index and a SiO2 film with a low refractive index; all the film layers are subjected to ion-assisted deposition, the ion energy is 350 eV, the ratio JI/JM of the number of argon ions reaching the substrate to the number of molecules of the deposited film is greater than 0.19, and it is ensured that the aggregation density of the film layers reaches 1, so that wavelength drift caused by water absorption is eliminated. The thermal expansion coefficient of the FEP plastic reaches 140 * 10 <-6 >/degree, and a film material with a small thermal expansion coefficient and positive and negative matched refractive index temperature coefficients is selected to eliminate wavelength drift caused by ambient temperature. The ultra-narrow band optical filter can be widely applied to optical, photoelectric and laser systems and instruments to serve as a stable signal filter.

The invention relates to a device for fixing heating surfaces in a supercritical tower type boiler. In the conventional CE technology, horizontal heating surfaces are hung by pipe clamps, angle plates and round steel hanging devices, and the expansion problem cannot be solved. The device for fixing the heating surfaces in the supercritical tower type boiler comprises that: the heating surfaces adopt tower type arrangement and are fixed above a hearth; each level of the heating surfaces in a low-temperature smoke region and a high-temperature smoke region is arranged horizontally; the heating surfaces are hung and fixed sequentially from top to bottom through hanging pipes (3); all the heating surfaces pass through a front water cooled wall or a rear water cooled wall; a heating surface pipe at the position of the water cooled wall is welded with fins of the water cooled wall; the other end expands freely; a hanging device (1) of the heating surface positioned in the low-temperature smoke region is provided with a group of upper coil pipes (4) arranged sequentially; and a hanging device (2) of the heating surface positioned in the high-temperature smoke region is provided with a group of lower coil pipes (5) arranged sequentially. The device is used for fixing the heating surfaces in the supercritical tower type boiler.

The invention provides a high-expansion-ratio structure for a deformation model. The structurecomprises two supports arranged in parallel, a crossed connecting rod group is arranged between the two supports, the crossed connecting rod group comprises a plurality of connecting rods hinged in a crossed manner, the connecting rods hinged in the crossed manner form a parallelogram structure, and the end parts of lower connecting rods at two ends of the crossed connecting rod group are hinged to the bottom of the bracket; and a through groove sliding rail is formed in the upper portion of the support, a sliding table connecting piece is arranged in the through groove sliding rail, and the ends of connecting rods on the upper sides of the two ends of the crossed connecting rod set are hinged to the sliding table connecting piece. The structure is characterized in that: the length of transverse and horizontal unfolding can be replaced by vertical displacement through a folding method, the connecting rods are stacked in the vertical direction in a complete contraction state, and the occupied horizontal space is extremely small, so that a plurality of groups of folding connecting rods can be mounted in a limited horizontal space by utilizing the shape change of a two-dimensional space, and the expansion range is larger.

The invention discloses an expansive agent for concrete and a preparation method of the expansive agent, and belongs to the field of expansive agent for concrete. The method comprises the steps: taking high-iron waste residues, a calcium source, an aluminum source and gypsum as raw materials, adding a mineralizer and an auxiliary fuel, uniformly mixing, adding water, and carrying out ball milling;and drying slurry, putting the dried slurry into a resistor, roasting, uniformly mixing, calcining in a high-temperature furnace to obtain concrete expansion clinker with anhydrous calcium sulfoaluminate and dicalcium aluminoferrite as main components, and mixing the concrete expansion clinker with a proper amount of gypsum to obtain the sulfoaluminoferrite expansive agent. The method is low in production cost, and the prepared expansive agent for concrete has good restrained expansion rate, high compressive and flexural strength and good comprehensive performance, and meets the performance requirements of the national standard GB/T23439-2017 'Expansive Agent for Concrete'.

The invention discloses a research method for frost resistance of lignin-modified silty clay. The method comprises the following steps: S1. air drying the silty clay, and screening out granular siltyclay; S2. doping the the screened silty clay with lignin; S3. uniformly stirring silty clay samples with different lignin doping ratios, performing sealed infiltration for 12h, forming a cylindrical test piece by using a static pressure method, culturing the cylindrical test piece in a sealed manner at constant temperature and constant humidity, and then performing a freezing and thawing cycle test; S4. performing a repeated loading dynamic rebound modulus test on the test piece before and after the freezing and thawing cycle test; S5. performing a bearing ratio test on the test piece before and after the freezing and thawing cycle test; and S6. performing a heat conductivity coefficient test on the test piece before and after the freezing and thawing cycle test. By adopting the research method for frost resistance of lignin-modified silty clay disclosed by the invention, the blank of the research on the road performance of an industrial by-product in cold regions, that is, the lignin-modified silty clay, under a freezing and thawing cycle condition is filled.

The invention discloses a clamping method applicable to a tensile strength test of a cylindrical part. The method comprises the following steps: A, mounting a wedge-shaped clamping plate in a wedge-shaped opening of a clamping body, connecting two parts of the clamping body through a telescopic structure, inserting a wedge-shaped bayonet and a wedge-shaped clamping plate, mounting an ejector rod above the wedge-shaped clamping plate, and mounting a stop baffle and a tension spring outside the wedge-shaped bayonet and the wedge-shaped clamping plate; B, adjusting the length of the telescopic structure, fixing the telescopic structure, upwards starting the ejector rod, and putting a test piece into the wedge-shaped bayonet; C, pressing the wedge-shaped clamping plate by using the ejector rod, folding the wedge-shaped clamping plate, and driving the wedge-shaped bayonet to clamp the test piece; D, repeating the step C, and clamping the other end of the test piece; E, enabling the wedge-shaped clamping plate to open along two sides of a wedge-shaped included angle beta by the ejector rod, and loosening the test piece by the wedge-shaped bayonet. The wedge-shaped clamping plate has great expansion, the wedge-shaped bayonet has a small lock corner and is convenient to detach and high in self-locking property, and the method is applicable to cylindrical parts of different sizes.

The invention discloses a composite internal-curing shrinkage-reducing anti-cracking agent for concrete and a production method of the composite internal-curing shrinkage-reducing anti-cracking agent, and belongs to concrete additives. The agent is prepared from the following components in parts by weight: a modified expanding agent, acrylic acid modified polypropylene fibers, graphene oxide and a polycarboxylic acid water reducing agent. The graphene oxide is used as an adsorption point to adsorb acrylic acid modified polypropylene fibers to form a three-dimensional network branch-tendril-shaped capillary structure, and countless uniformly-distributed micro water storage tanks are formed in the concrete, so that the hydration reaction of a cementing material is promoted to the greatest extent, and the deformation performance, the crack resistance and the durability of the concrete are obviously improved.