4 results about "Bulk fill" patented technology

The invention discloses structure reconstruction type resin wood and a preparation method thereof. The preparation method comprises the following steps that wood with a certain water content is subjected to intermittent microwave treatment with specific energy density, a high-density compressed wood tissue structure and a crack cavity structure are constructed in the wood, and a structure reconstruction type wood base material is obtained; and after the moisture content of the wood base material is regulated and controlled, the crack cavity structure of the base material is filled with low-viscosity thermosetting resin through a vacuum impregnation method, curing is conducted, and the structure reconstruction type resin wood is obtained. The internal structure of the wood forms a stable and uniform wood skeleton with compressed density through two times of intermittent microwave treatment, and after entering, a large amount of resin is filled in an internal crack cavity structure to form an obvious interface structure with the wood skeleton. The prepared resin wood is uniform in wood unit density distribution, has excellent mechanical properties while retaining the pore structure of the wood, and is suitable for building structure materials and high-performance wood products.

The application discloses a kind of compaction bulk filling material resistivity characteristic testing device, belong to geotechnical engineering and mining engineering technical field, including bulk filling material compaction unit and resistivity test unit;Compaction unit can realize the constant load compaction of bulk filling material, and the target compaction state of sample is maintained by locking clamp, to avoid unloading rebound;Resistivity test unit can realize the axial height adjustment of test probe and the adjustment of different angles of compaction box circumference, without transferring sample to complete the resistivity in-situ test of different compaction states, different spatial positions.The application realizes the integration of bulk filling material compaction and resistivity test, solves the problems of sample disturbance, compaction state and test working condition mismatch, incomplete test dimension in the prior art, and can accurately obtain the correlation between bulk filling material compaction degree and resistivity, to provide reliable experimental data support for resistivity detection of goaf filling body density.

The invention discloses a high-performance two-component flame-retardant waterproof polystyrene foam and a preparation method, and relates to the technical field of building waterproof materials, the high-performance two-component flame-retardant waterproof polystyrene foam comprises a component A and a component B, and the mixing ratio of the component A to the component B is 1: 1 by mass; the component A is prepared from the following components according to the total mass: a silicon-ether-epoxy hybrid prepolymer, polyether polyol 3030K, nano microencapsulated ammonium polyphosphate and organic phosphorus modified polyol. According to the invention, a silyl ether epoxy hybrid curing technology and a nanoscale composite flame-retardant synergistic strategy are adopted, so that the defects in the prior art are effectively overcome. A system framework is constructed through a silyl ether epoxy hybrid prepolymer, and the flexibility of polyether polyol is combined, so that the product has high bonding strength and good elasticity, the elongation can reach 50% or above, and the tensile bonding strength with concrete is greatly enhanced. A nanoscale composite flame-retardant system has a synergistic effect, so that the flame-retardant property of the product reaches UL-94 flame-retardant grade of V-0, and the influence of a large amount of filled flame retardant on foaming and mechanical properties is avoided.

The invention relates to a mining design method for layered caving-subsequent filling and a mining method. The mining design method comprises the following steps: acquiring a first crushing and expansion coefficient of ore and a second crushing and expansion coefficient of hanging wall surrounding rock; based on the production plan and the ore body condition, determining the thickness of ore protolith to be mined; according to the first fragmentation and expansion coefficient, the second fragmentation and expansion coefficient, the thickness of the ore protolith to be mined and a preset volume balance relation, the minimum thickness of hanging wall surrounding rock protolith which is needed for ensuring that the mining space is completely filled and needs to induce caving is calculated; and according to the thickness of the ore protolith to be mined and the minimum thickness of the hanging wall surrounding rock protolith to be induced to fall, the final height of the chamber is obtained. The method comprises the following steps: pre-designing by quantifying a fragmentation coefficient and establishing a volume balance relationship, and calculating the minimum thickness of surrounding rock caving, so as to determine a reasonable room height and ensure that caved bulk fills a mining space; the calculation design replaces experience trial and error, the scientificity of the scheme is improved, and a foundation is laid for safe, efficient and low-depletion recovery.