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us8845940b2 carbon dioxide treatment of concrete

us8845940b2 carbon dioxide treatment of concrete

US8845940B2 - Carbon dioxide treatment of concrete ...

US8845940B2 US13/660,447 US201213660447A US8845940B2 US 8845940 B2 US8845940 B2 US 8845940B2 US 201213660447 A US201213660447 A US 201213660447A US 8845940 B2 US8845940 B2 US 8845940B2 Authority US United States Prior art keywords gas concrete carbon dioxide mold component Prior art date 2012-10-25 Legal status (The legal status is an assumption and is not a

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US9492945B2 - Carbon dioxide treatment of concrete ...

Fresh concrete is treated with carbon dioxide prior to delivery to a product mold for forming concrete products. Carbon dioxide gas is directed through a manifold, which may be coupled to a feedbox or a hopper, upstream from the product mold. Treating the fresh concrete with the carbon dioxide gas while it is in a loose state prior to placement in the product mold may generally promote uniform ...

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WO2014063242A1 - Carbon dioxide treatment of concrete ...

B — PERFORMING OPERATIONS; TRANSPORTING; B28 — WORKING CEMENT, CLAY, OR STONE; B28B — SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING C

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US10654191B2 - Carbon dioxide treatment of concrete ...

Fresh concrete is treated with carbon dioxide prior to delivery to a product mold for forming concrete products. Carbon dioxide gas is directed through a manifold, which may be coupled to a feedbox or a hopper, upstream from the product mold. Treating the fresh concrete with the carbon dioxide gas while it is in a loose state prior to placement in the product mold may generally promote uniform ...

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CO2 Emissions Profile of the U.S. Cement Industry

Global carbon dioxide (CO2) emissions from cement production were approximately 829 million metric tons of CO2 (MMTCO2) in 2000 1, about 3.4% of global CO 2 emissions from fossil fuel combustion and cement production. The United States is the world’s third largest cement producer, with production occurring in 37 states.

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US4436498A - Apparatus for curing concrete products ...

A method and apparatus for rapidly manufacturing concrete or like products having an advanced state of cure by blending together a calcareous cementitious binder, aggregate, and water to form a mix, molding the mixture to have a predetermined shape and exposing the shape to an atmosphere in a chamber consisting essentially of carbon dioxide gas, wherein carbon dioxide gas is fed under ...

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Using Carbon Dioxide as a Beneficial Admixture in Ready ...

2 gas and solid carbon dioxide snow. The carbon dioxide was delivered, at a specified flow rate over a fixed injection interval, into the truck whereupon it reacted with the hydrating cement before the concrete mix was completed. The concrete was then subjected to assessment and testing. 2.1 Methods

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This concrete can trap CO2 emissions forever

Jul 06, 2018  Cement is the glue that makes concrete strong, but the process of making cement requires superheating calcium carbonate, or limestone, and releases massive amounts of carbon dioxide into the ...

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US20110289901A1 - Carbon dioxide sequestration in freshly ...

Sep 12, 2017  A process for sequestering carbon dioxide in fresh concrete from the exhaust emitted from the combustion of carbonaceous fuel in a concrete mixing truck is disclosed. In the process, exhaust from the engine containing carbon dioxide is redirected after passing through the required environmental controls to the concrete mixing chamber on the concrete truck.

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US5257464A - System and method of curing concrete products ...

A system for curing concrete products resident in a kiln, in particularly for producing high strength building blocks from relatively dry green concrete, controls temperature and humidity in the kiln as a function of time in the curing cycle from a water pool heated by underwater grates near the upper water surface. Heated air and air/CO 2 mixture also is circulated in the kiln during relevant ...

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Carbon dioxide utilization in concrete curing or mixing ...

Feb 08, 2021  Carbon capture and utilization for concrete production (CCU concrete) is estimated to sequester 0.1 to 1.4 gigatons of carbon dioxide (CO2) by

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Winners of $20M contest make concrete to trap carbon dioxide

Both winners made concrete that trapped carbon dioxide, keeping it out of the atmosphere, where it can contribute to climate change. Production of cement, concrete’s key ingredient, accounts for 7% of global emissions of the greenhouse gas, said Marcius Extavour, XPRIZE vice

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Potential for Carbon Adsorption on Concrete: Surface XPS ...

Jun 11, 2008  The concrete industry is a contributor to the global carbon cycle particularly with respect to the contribution of carbon dioxide in the manufacturing of cement (calcination). The reverse reaction of carbonation is known to occur in concrete, but is usually limited to exterior surfaces exposed to carbon dioxide and humidity in the air. As alternate concrete uses expand which have more surface ...

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CarbonCure’s CO2-infused process strengthens concrete

Apr 19, 2017  CarbonCure Technologies of Dartmouth, N.S. is looking to make concrete stronger and greener by infusing it with recycled carbon dioxide (CO2). The concept isn’t new, but CarbonCure’s process is. The company’s patented technology has been used in several recent construction projects and earned the firm industry kudos.

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Overview of Greenhouse Gases US EPA

Apr 14, 2021  Carbon dioxide (CO 2): Carbon dioxide enters the atmosphere through burning fossil fuels (coal, natural gas, and oil), solid waste, trees and other biological materials, and also as a result of certain chemical reactions (e.g., manufacture of cement).Carbon dioxide is removed from the atmosphere (or "sequestered") when it is absorbed by plants as part of the biological carbon cycle.

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Concrete Construction ConcreteConstruction

bon dioxide with earth-en minerals and the en-vironment. “Carbon dioxide’s affinity to wa-ter forms a self-buffering acid (that eliminates over-treatment), making it safe to use and handle.” How it works Process water dissolves calcium hy-droxide and other alkalies that are pre-sent in fresh and hardened concrete, elevating process-water ...

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Reimagining CO2: UCLA team advances to Carbon XPRIZE ...

Apr 09, 2018  Working to upend one of the most stalwart of construction materials, a team of UCLA engineers, scientists and policy experts has advanced to the finals of the $20 million NRG COSIA Carbon XPRIZE by successfully creating a near carbon dioxide-neutral version of concrete.. The international competition, which began in 2015 and is scheduled to conclude in 2020, challenged teams to develop carbon ...

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Concrete Carbonation - Building Defect Analysis

Aug 20, 2017  Carbon dioxide can form carbonic acid with the water in the cement that then neutralizes the alkaline state of the concrete. If this happens, then carbonation moves through the concrete as a front that gradually reduces the pH value to 8pH; neutral is 7pH. However, corrosion to the reinforcement can occur if the pH value falls below 11pH.

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Treating concrete water Project Scotland

Mar 24, 2016  Lastly it is a much more cost effective treatment – costing around £0.35/m3 compared to circa £2.50/m3 for citric acid and £1.50/m3 for mineral acids. In short, when you weigh up the technical, environmental, health and safety and cost issues, carbon dioxide is by far the best way to neutralise highly polluting concrete washwater.

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Cement soaks up greenhouse gases Science AAAS

Nov 21, 2016  Cement-based materials, like the concrete used to build parts of Russia's Ural Highway from Moscow to the Ural Mountains, gradually absorb large amounts of carbon dioxide

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Bendable concrete and other CO2-infused cement mixes could ...

Feb 14, 2021  The production of cement, the binding element in concrete, accounted for 7% of total global carbon dioxide emissions in 2018. Concrete is one of the most-used resources on Earth, with an estimated 26 billion tons produced annually worldwide. That production isn’t expected to slow down for at least two more decades.

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Winners of $20m contest make concrete to trap carbon dioxide

Apr 19, 2021  Both winners made concrete that trapped carbon dioxide, keeping it out of the atmosphere, where it can contribute to climate change. Production of cement, concrete’s key

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SB161 - capitol.hawaii.gov

The legislature finds that cement, the critical ingredient in concrete, produces more than seven per cent of the world's carbon dioxide. However, emission of carbon dioxide from cement can be halted by injecting carbon dioxide into the concrete during mixing. This process chemically transforms the carbon dioxide into mineral form, embedding it ...

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Patents Assigned to CARBONCURE TECHNOLOGIES INC. -

Jul 14, 2017  Abstract: Fresh concrete is treated with carbon dioxide prior to delivery to a product mold for forming concrete products. Carbon dioxide gas is directed through a manifold, which may be coupled to a feedbox or a hopper, upstream from the product mold. Treating the fresh concrete with the carbon dioxide gas while it is in a loose state prior to placement in the product mold may generally ...

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The cement that absorbs carbon dioxide - CEMBUREAU

Apr 09, 2018  The other relationship is a much more beneficial one. Concrete that is exposed to the air naturally undergoes carbonation, a process where carbon dioxide is slowly reabsorbed into concrete’s structure and reacts with the calcium hydroxide

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Carbon dioxide uptake by concrete

• Carbon dioxide uptake during concrete life cycle, state of the art, published by Swedish Cement and Concrete Research Institute (CBI),cbi.se, ISBN 91-976070-0-2. • Information on the use of concrete in Denmark, Sweden, Norway and Iceland, published by Icelandic Building Research Institute, ibri.is, ISBN 9979-9174-7-4.

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Binding carbon dioxide using broken concrete

Aug 24, 2020  Binding carbon dioxide using broken concrete. Neustark's pilot plant turns broken concrete and CO 2 into stone granulate that can serve as a replacement for sand and gravel in fresh concrete ...

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Carbonation of Reinforced Concrete - Ronacrete

The Chemical Process of Carbonation – accepted wisdom. Atmospheric carbon dioxide reacts with calcium hydroxide (Ca (OH)2 + CO2 =CaCO3 + H2O), a cement hydration product in the cement paste. The reaction produces calcium carbonate. This reduces the alkalinity of the concrete to a level where the cement paste no longer provides a passive ...

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1 A BILL AN ACT - Hawaii

(1) Cost more than the use of concrete; or (2) Delay the completion of the state building construction. As used in this section, "post—industrial carbon dioxide mineralized concrete" means concrete that has undergone active carbonation treatment during mixing, in which carbon dioxide is injected into and mineralized within the concrete ...

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Concrete Rehabilitation - OXO H2O Solutions

Note: New concrete has a pH of 11+, which passivates the corrosion of reinforcing steel. Carbon dioxide can lower the pH through a process called carbon dioxide diffusion. When the OXOCRETE System is applied from the surface, it has fully restored pH to better-than-new conditions.

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Carbonation - an overview ScienceDirect Topics

Carbonation is the process of formation of calcium carbonate through reaction of carbon dioxide with concrete constituents of calcium hydroxide, aluminates, and silicates. This process results in the initiation of rebar corrosion in the reinforced concrete (Limbachiya et al., 2012 ). It was reported that an increase in RCA% resulted in an ...

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Patents Assigned to CARBONCURE TECHNOLOGIES INC. -

Jul 14, 2017  Abstract: Fresh concrete is treated with carbon dioxide prior to delivery to a product mold for forming concrete products. Carbon dioxide gas is directed through a manifold, which may be coupled to a feedbox or a hopper, upstream from the product mold. Treating the fresh concrete with the carbon dioxide gas while it is in a loose state prior to placement in the product mold may generally ...

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Concrete carbon calculator Hanson UK

Being able to replace Portland Cement (CEMI) in a concrete mix with Hanson Regen (Ground Granulated Blast furnace Slag or ‘GGBS’) results in a much lower level of embodied CO2 than if ordinary cement was used. Hanson Regen, along with other environmental benefits, also improves the performance of the product, making it more durable and aesthetically lighter in colour. Use the

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Biochar as green additives in cement-based composites with ...

Jun 10, 2020  Biochar is a green material obtained from the thermochemical conversion of waste biomass under an oxygen-limited condition. This study demonstrated a novel and sustainable method for incorporating waste wood-derived biochar in cement-based composites with CO 2 curing. The X-ray diffraction (XRD) and thermogravimetric analyses (TGA) illustrated that the incorporation of biochar

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BMP C253: pH Control for High pH Water

BMP C252: High pH Neutralization Using CO2 gives guidelines for carbon dioxide sparging. Reason for pH Neutralization: A pH level range of 6.5 to 8.5 is typical for most natural watercourses, and this pH range is required for the survival of aquatic organisms.

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