4results about How to "Reduce internal porosity" patented technology

This invention relates to the field of repair materials technology, and discloses a binary composite fiber-reinforced epoxy resin-based rapid repair material and its preparation method, comprising the following raw materials in the indicated mass ratios: 259.85g epoxy resin, 89.36g curing agent, 25.99g diluent, 24.22g toughening agent, 1200g fine aggregate, 259.85g filler, 1.04g defoamer, 0.78-2.34g basalt fiber, and 15.59-31.18g calcium sulfate whiskers. In this invention, the large-scale basalt fiber and the small-scale calcium sulfate whiskers are mixed and incorporated into the binary composite fiber-reinforced epoxy resin-based rapid repair material and its preparation method. The abundant freely distributed fibers can constrain the propagation of microcracks of different sizes and regions within the repair material matrix, effectively improving the shortcomings of conventional epoxy resin-based repair materials, such as poor early performance, high brittleness, and insufficient toughness, achieving a balance between high early strength and high toughness in the epoxy resin-based repair material.

This application relates to the field of monolithic refractory materials, specifically disclosing a self-flowing, densified, cement-free refractory castable and its preparation process. The self-flowing, densified, cement-free refractory castable includes aggregates, binders, admixtures, a modified water-reducing agent, and water. The preparation method of the modified water-reducing agent includes the following steps: adding an aqueous solution of methacryloyloxyethyl phosphate, methoxy polyethylene glycol acrylate, acrylic acid, methacryloyloxypropyltrimethoxysilane, and mercaptoacetic acid to water to obtain solution A; adding ammonium persulfate and ammonium bisulfite to water and mixing thoroughly to obtain solution B; adding water to a reaction vessel, heating, and simultaneously adding solutions A and B dropwise to the reaction vessel; after the addition is complete, maintaining the temperature to continue the reaction, cooling, and adjusting the pH with triethanolamine to obtain the modified water-reducing agent. The refractory castable in this application has excellent self-flowing molding, a highly dense structure, and high-temperature resistance and slag corrosion resistance.

This invention provides a mixed aggregate mine backfill material of ultra-fine iron tailings sand and steel slag sand and its preparation method, belonging to the field of building materials. The mixed aggregate mine backfill material of ultra-fine iron tailings sand and steel slag sand provided by this invention comprises the following components in parts by weight: 6-13 parts iron tailings powder, 9-20 parts slag powder, 0.5-1 part desulfurization ash, 20-38 parts ultra-fine iron tailings sand, 10-28 parts steel slag sand, 0.6-1.4 parts activator, and 25-41 parts water. The mixed aggregate mine backfill material of ultra-fine iron tailings sand and steel slag sand provided by this invention has a 120-day shrinkage rate as low as 2.12% and a 28-day compressive strength as high as 7.68 MPa, exhibiting low shrinkage and high compressive strength.

This invention belongs to the field of industrial solid waste resource utilization technology, and relates to a circulating fluidized bed ash-based cementitious material for road base courses and its preparation method. The raw materials for the road base course cementitious material are composed of the following mass parts: 29-43 parts of circulating fluidized bed ash, 16-27 parts of ground blast furnace slag, 3-6 parts of silica fume, 7-15 parts of P.O42.5 silicate cement, 0.1-0.4 parts of activator, and 27-30 parts of water. The circulating fluidized bed ash is prepared by mixing circulating fluidized bed fly ash and slag in a mass ratio of (2-5):(5-10). This invention effectively alleviates the problems of fast setting time and shrinkage cracking of traditional road base course cementitious materials by utilizing the characteristics of micro-expansion and long hydration time of circulating fluidized bed ash. The advantage of this invention is that it promotes the large-scale utilization of circulating fluidized bed ash and contributes to carbon emission reduction in the road sector.