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3 results about "Pozzolanic reaction" patented technology
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The pozzolanic reaction is the chemical reaction that occurs in portland cement containing pozzolans. It is the main reaction involved in the Roman concrete invented in Ancient Rome and used to build, for example, the Pantheon. At the basis of the pozzolanic reaction stands a simple acid-base reaction between calcium hydroxide, also known as Portlandite, or, and silicic acid. Simply, this reaction can be schematically represented as follows: Ca(OH)₂ + H₄SiO₄ → Ca²⁺ + H₂SiO₄²⁻ + 2 H₂O → CaH₂SiO₄ · 2 H₂O or summarized in abbreviated notation of cement chemists: CH + SH → C-S-H The product of general formula formed is a calcium silicate hydrate, also abbreviated as C-S-H in cement chemist notation, the hyphenation denotes the variable stoichiometry. The ratio Ca/Si, or C/S, and the number of water molecules can vary and the above-mentioned stoichiometry may differ. Many pozzolans contain aluminate, or Al(OH)₄⁻, that will react with calcium hydroxide and water to form calcium aluminate hydrates such as C₄AH₁₃, C₃AH₆ or hydrogarnet, or in combination with silica C₂ASH₈ or strätlingite.
Method to enhance pozzolan reactivity utilizing acid
A method of preparing an acid modified pozzolan may include: contacting a starting pozzolan with an acid to form a mixture of the starting pozzolan and the acid; reacting the mixture of starting pozzolan and the acid during an induction period to form reaction products; and recovering the acid modified pozzolan.
Owner:HALLIBURTON ENERGY SERVICES INC
Basalt powder and basalt fiber reinforced anti-cracking mortar and preparation method thereof
The application provides a basalt powder and a basalt fiber reinforced anti-cracking mortar and a preparation method thereof, and belongs to the technical field of cement, concrete and other building materials. The application comprises components of Portland cement, basalt powder, graded sand, basalt fiber, latex powder, cellulose ether and water reducing agent. The application optimizes the compactness of the matrix by filling and reacting with the basalt powder and the pozzolanic ash, and forms a three-dimensional reinforcing network with strong interfacial bonding by using the basalt fiber which is subjected to surface etching and silane coupling treatment. The two components synergistically improve the crack resistance and toughness of the mortar, and the mortar shows a high ductility failure mode with multiple crackings. Meanwhile, the tensile strength, the bending strength and the compressive strength of the mortar are comprehensively enhanced, and the fracture energy is significantly improved. In addition, the high-density matrix and the corrosion-resistant fiber together endow the mortar with excellent impermeability, freeze-thaw resistance and corrosion resistance, and greatly prolong the service life.
Owner:GUANGXI HARBOR NEW MATERIALS TECHNOLOGY CO LTD
A red mud solidifying agent and a preparation method thereof
This patent application discloses a red mud solidifying agent and its preparation method. The red mud solidifying agent is prepared from the following raw materials: metakaolin, accounting for 18-22% of the total mass of the solidifying agent; the remaining mass of the solidifying agent after removing the metakaolin, by mass percentage, consists of 5-20 parts fly ash, 1-20 parts slag, and 1-15 parts sodium silicate as an alkaline activator. The red mud solidifying agent synergistically solidifies red mud through multiple processes such as geopolymerization, "volcanic ash reaction," and filling-dispersion reaction. The active silica, alumina, and alkali ions abundant in red mud directly participate in the reaction, forming dense, uniform, and high-strength solidified red mud. Using the red mud solidifying agent to solidify red mud can reduce the consumption of building materials such as cement and lime during highway construction, thereby reducing costs and environmental pollution. In addition, it can promote the resource utilization of red mud and the comprehensive utilization of industrial wastes such as fly ash and slag, possessing both economic and environmental value.
Owner:CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY