us8845940b2 carbon dioxide treatment of concrete

Provide customers with tailor-made solutions

US8845940B2 - Carbon dioxide treatment of concrete ...

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 and enhanced carbon dioxide uptake. Fresh...

Get Price

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

Get Price

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 ...

Get Price

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.

Get Price

CO2-treatment of recycled concrete aggregates to

2021-3-15  Among those efforts, a strategy of carbonation via the treatment using carbon dioxide (CO 2) has emerged in the last decade. For instance, such a strategy has been examined for cement-based materials [7] and concrete mixed with RCA [8] , [9] , [10] , as well as CO 2 -treatment of RCA for the application to concrete [6] , [11] , mortar [12 ...

Get Price

Winners of $20M contest make concrete to trap carbon

2021-4-19  Winners of $20M contest make concrete to trap carbon dioxide. There are two winners of a $20 million contest to make products from carbon dioxide emitted by power plants

Get Price

How to specify lower carbon concrete - The Institution of ...

2020-8-6  Concrete mix and embodied CO2. Concrete is made from aggregate, cement, and water. Admixtures can be (and normally are) included in the mix. In terms of embodied carbon for the different elements, aggregates and water have very low embodied carbon. Locally sourced primary aggregates have an embodied carbon of about 4kgCO 2 /tonne. It is the ...

Get Price

Using CO2 to Make Concrete Global Opportunity Explorer

2018-11-9  To make concrete, the cement and sand mix is hardened and cured utilising mainly waste CO2 instead of water. According to Solidia, the technology can reduce CO2 emissions by up to 70% and eliminate water usage compared with conventional production. Solidia’s concrete

Get Price

WHAT IS CONCRETE CARBONATION AND HOW IS IT

2021-2-5  Concrete carbonation is the result of an electrochemical reaction between carbon dioxide, moisture and calcium hydroxide that is present in cement, producing calcium carbonate. Calcium carbonate lowers the alkalinity of concrete from pH12 – 13 to around pH9. This hardens the concrete and increases its compressive strength, but at this reduced ...

Get Price

Bigger Climate Action Emerging in Cement Industry

2021-8-17  UN Climate Change News, Bonn, Oct 26 – The global cement industry is taking increasing climate action, encouraged by changes in policy, technology and new opportunities to raise profits and cut costs through reducing greenhouse gas emissions.. The full and willing participation of a sector which accounts for 5-6% of global emissions is critical to contribute to the goal of the 2015 Paris ...

Get Price

CO2-treatment of recycled concrete aggregates to

2021-3-15  Among those efforts, a strategy of carbonation via the treatment using carbon dioxide (CO 2) has emerged in the last decade. For instance, such a strategy has been examined for cement-based materials [7] and concrete mixed with RCA [8] , [9] , [10] , as well as CO 2 -treatment of RCA for the application to concrete [6] , [11] , mortar [12 ...

Get Price

CO2-treatment of recycled concrete aggregates to

CO 2-treatment of recycled concrete aggregates to improve mechanical and environmental properties for unbound applications. ... In the meantime, a strategy of RCA carbonation using carbon dioxide (CO 2) to improve the mechanical properties and durability of RCA has emerged.

Get Price

Carbonation of Reinforced Concrete - Ronacrete

2021-8-18  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

Get Price

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.

Get Price

A novel reduction process of CO2 fixation by waste ...

A new process to fix anthropogenic carbon dioxide via treatment of waste concrete was proposed. The main reaction of the process is the extraction of calcium ions from waste concrete particles by use of pressurized carbon dioxide (several MPa in pressure).

Get Price

Diagnosing and repairing carbonation in concrete

2016-3-24  Keywords: concrete, carbonation, HAC, corrosion, aggregates, curing, admix, passive layer HISTORY OF CONCRETE The word concrete comes from the Latin word concretus, which means compact or condensed. Concrete was an important con-struction material in Roman times and was widely used in their buildings. There is, however, evidence that concrete ...

Get Price

How New Forms of Concrete Could Capture Carbon

2021-5-21  Producing concrete requires heating limestone with other aggregates in a kiln at 1,450 degrees Celsius, fired by burning coal or other fossil fuels that produce carbon dioxide.

Get Price

Using CO2 to Make Concrete Global Opportunity Explorer

2018-11-9  To make concrete, the cement and sand mix is hardened and cured utilising mainly waste CO2 instead of water. According to Solidia, the technology can reduce CO2 emissions by up to 70% and eliminate water usage compared with conventional production. Solidia’s concrete

Get Price

WHAT IS CONCRETE CARBONATION AND HOW IS IT

2021-2-5  Concrete carbonation is the result of an electrochemical reaction between carbon dioxide, moisture and calcium hydroxide that is present in cement, producing calcium carbonate. Calcium carbonate lowers the alkalinity of concrete from pH12 – 13 to around pH9. This hardens the concrete and increases its compressive strength, but at this reduced ...

Get Price

Anti-Carbonation Protective Coatings - Flexcrete

Carbon dioxide from the atmosphere reacts with the concrete, leading to a loss of alkalinity and subsequent corrosion of the reinforcing steel. Structural integrity can therefore become severely compromised so it is critical to specify anti-carbonation

Get Price

This concrete can trap CO2 emissions forever

2018-7-7  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 ...

Get Price

Emissions from the Cement Industry - State of the Planet

2012-5-9  Emissions from the Cement Industry. A single industry accounts for around 5 percent of global carbon dioxide (CO 2) emissions. It produces a material so ubiquitous it is nearly invisible: cement. It is the primary ingredient in concrete, which in turn forms

Get Price

Carbonation of Reinforced Concrete - Ronacrete

2021-8-18  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

Get Price

Effect of CO2 surface treatment on penetrability and ...

CO 2 surface treatment reduces the air and water permeability of the concrete.. CO 2 surface treatment reduces the capillary water absorption of concrete.. Fly ash-slag combination reduces permeability better than either of them used alone. • CO 2 surface treatment reduces Ca (OH) 2 content at depth~1.5 mm.. CO 2 surface treatment reduces the Ca/Si ratio of C–S–H, CaCO 3 is covered by C ...

Get Price

How New Forms of Concrete Could Capture Carbon

2021-5-21  Producing concrete requires heating limestone with other aggregates in a kiln at 1,450 degrees Celsius, fired by burning coal or other fossil fuels that produce carbon dioxide.

Get Price

Anti-Carbonation Protective Coatings - Flexcrete

Carbon dioxide from the atmosphere reacts with the concrete, leading to a loss of alkalinity and subsequent corrosion of the reinforcing steel. Structural integrity can therefore become severely compromised so it is critical to specify anti-carbonation

Get Price

Bigger Climate Action Emerging in Cement Industry

2021-8-17  UN Climate Change News, Bonn, Oct 26 – The global cement industry is taking increasing climate action, encouraged by changes in policy, technology and new opportunities to raise profits and cut costs through reducing greenhouse gas emissions.. The full and willing participation of a sector which accounts for 5-6% of global emissions is critical to contribute to the goal of the 2015 Paris ...

Get Price

Concrete carbon calculator Hanson UK

2021-8-19  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

Get Price

Binding carbon dioxide using broken concrete - Phys

2020-8-24  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 ...

Get Price

Assia DJERBI PhD

Recycled concrete aggregates (RCA), during their carbonation, can uptake CO2. Carbonation is described also as a treatment for RCA, to improve water absorption.

Get Price