6results about How to "Low crush value" patented technology

The invention discloses a roadbed soft rock filler crushing value estimation method considering the content of coarse and fine particles, which comprises the following steps: S1, for a filled soft rock filler roadbed, determining the compaction dry density rho d by adopting a sand filling method, and determining the maximum dry density through an indoor compaction test to obtain a compaction coefficient; s2, performing a particle screening test on the roadbed soft rock filler to obtain the ratio of the mass of coarse particles with the particle size not smaller than 2.5 mm to the total mass; s3, through a point load test, measuring the point load strength of coarse-particle rocks in not less than 6 soft rock fillers, and obtaining the uniaxial compressive strength of the rocks and the average value of the uniaxial compressive strength of the rocks; and S4, estimating the crushing value of the roadbed soft rock filler according to the compaction coefficient of the roadbed soft rock filler, the mass ratio of the coarse particles and the average value of the uniaxial compressive strength of the rock blocks. According to the method, the influence of the strength of the coarse particle rock, the proportion of coarse and fine particles and the compaction density on the crushing value can be comprehensively considered. The test verifies that the method has good applicability.

The invention discloses a method for preparing road concrete through urban solid waste regeneration, belongs to the technical field of concrete processing, and aims to solve the technical problem that the mechanical property, wear resistance and freezing resistance of road concrete need to be further improved in the prior art. The method comprises the following steps: adding an epoxy resin mixed solution, an ammonia water solution and a modified curing agent into a concrete mixer, stirring for 10-15 minutes, adding regenerated rubber powder, regenerated composite fibers, regenerated coarse aggregates, regenerated solid waste mixed powder, a water reducing agent and deionized water, and stirring for 5-10 minutes to obtain a concrete mixture; according to the invention, epoxy resin is taken as a cross-linking agent, a modified curing agent is taken as a flexibilizer, and the epoxy resin, the modified curing agent, the regenerated rubber powder, the regenerated coarse aggregate, the regenerated composite fiber, the regenerated solid waste mixed powder and the deionized water are stirred in a concrete stirrer to obtain the road concrete, so that the mechanical property and the wear resistance of the road concrete are improved; the freezing resistance of the road concrete is also improved.

This invention relates to a pretreated reinforced recycled aggregate concrete and its preparation method, comprising the following raw materials: 320-360 parts cement; 20-40 parts fly ash; 80-120 parts mineral powder; 585-670 parts manufactured sand; 1050-1200 parts recycled coarse aggregate; 156-172 parts water; and 11-12.3 parts admixtures. After pretreatment, the concrete prepared from the recycled coarse aggregate exhibits significantly improved performance compared to the untreated recycled coarse aggregate. The synergistic effect of multiple pretreatment methods significantly improves the water absorption, crushing index, and apparent density of the raw coarse aggregate. Pretreatment of the recycled coarse aggregate provides enhanced conditions for internal hydration in the recycled concrete and simultaneously improves the surface roughness of the recycled coarse aggregate, thus enhancing the workability and increasing the strength of the concrete.

The invention discloses modified recycled aggregate carbon-sequestration bare concrete and a preparation method thereof, belongs to the field of modified carbon-sequestration recycled concrete, and aims to solve the problem that multiple processes or equipment can be added for modification treatment of recycled aggregate in different ways regardless of pre-wetting treatment or carbonization treatment, so that the service life of the recycled aggregate is greatly prolonged. According to the present invention, the recycled aggregate modification material comprises the following components by mass: 140-180 parts of phosphorus slag, 190-230 parts of industrial solid waste composite powder, 30-40 parts of ordinary Portland cement, 710-760 parts of recycled sand, 890-940 parts of recycled gravel, 140-150 parts of water, 7-10 parts of an additive, 134-150 parts of a carbon fixation agent, and 3-5 parts of a GU release agent. The alkali-activated industrial solid waste composite powder is recycled, carbon emission in the concrete production process is reduced, and meanwhile, the alkali-activated industrial solid waste composite powder is matched with a special carbon fixing agent for use, so that the primary defects of recycled aggregate are effectively overcome. The simple and convenient modification pretreatment process of the recycled aggregate is realized, and the workability, the strength, the apparent quality and the carbon sequestration rate of the recycled aggregate bare concrete are greatly optimized.

The invention relates to the technical field of road bases, in particular to a basalt roadbed material for alpine regions, a preparation method of the basalt roadbed material and a roadbed base construction method, and the basalt roadbed material comprises the following components in parts by weight: 100 parts of basalt macadam and 12-20 parts of high-strength low-temperature-resistant unsaturated polyester resin. Wherein the high-strength low-temperature-resistant unsaturated polyester resin is prepared from the following raw materials in parts by weight: 5 to 10 parts of phthalic anhydride, 20 to 32 parts of methylpropanediol, 24 to 28 parts of maleic anhydride, 25 to 30 parts of styrene, 25 to 30 parts of itaconic acid, 0.5 to 2.5 parts of peroxybenzoic acid, 0.02 to 0.06 part of methylhydroquinone, 1 to 2 parts of basalt fiber and 1 to 5 parts of hollow microspheres. The basalt roadbed material provided by the invention has relatively good cold resistance and stability in a low-temperature environment, is not easy to crack, and has a wide application prospect in the roadbed field.

This invention belongs to the field of aggregate strengthening, specifically relating to a silicon-based composite reagent-strengthened recycled aggregate and its preparation method. The preparation method includes the following steps: crushing and sieving virgin mortar samples, then rinsing to remove impurities to obtain low-quality recycled coarse aggregate; then, under certain conditions, adding lime slurry and surfactant to the low-quality recycled coarse aggregate, stirring, and allowing it to stand, followed by cyclic stirring; then adding water, a hydrophobic agent, silica fume, and fly ash, and maintaining standing for 6–12 hours; finally, immersing in water to remove soluble impurities from the surface of the recycled aggregate, and air-drying to obtain the silicon-based composite reagent-strengthened recycled aggregate. This method, by comprehensively utilizing industrial by-products such as silica fume and fly ash, explores the application potential of industrial waste products in the field of construction solid waste resource utilization, increases resource utilization rate, efficiently utilizes industrial solid waste, and is conducive to resource conservation and the reuse of waste.