Development of a process for producing high …

A new type of process for producing high-purity calcium carbonate from waste cement powder was developed. The process consists of two main reactions; extraction of calcium in the form of calcium ions from waste cement powder in …

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Calcium carbonate and reactive silica recovery from waste …

In this study, we report the leaching kinetics and reactivity of 1-yr old hydrated waste cement paste produced from neat OPC at various slurry densities and in the presence of …

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Biogenic calcium carbonate derived from waste shells for …

Different methods recently came to light to process the calcium carbonate derived from eggshells and seashells. Thousands of research papers and more than 500 patents have emerged since the turn of the 21 st century for sustainable development growth (SDG) (Ahmed et al., 2021).As a result, several review papers have been published about eggshell, and …

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Development of a process for producing high‐purity calcium carbonate

A new type of process for producing high-purity calcium carbonate from waste cement powder was developed. The process consists of two main reactions; extraction of calcium in the form of calcium ions from waste cement powder in a water slurry by pressurized CO 2 (typically at several MPa), and precipitation of calcium carbonate (CaCO 3) from the extracted …

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Utilizing Waste Cement for Carbon Dioxide Sequestration …

High-alkaline waste cement possesses significant potential for effectively capturing and sequestering carbon dioxide, transforming it into calcium-rich, highly reactive, supplementary cementitious materials. Water plays a pivotal role in facilitating this reaction, yet there is a conspicuous absence of extensive research in this domain. This study elucidates the …

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Production of carbon negative precipitated calcium …

The calcium (Ca) content of cement is approximately 0.465 g/g (46.5 % by mass), [9] and therefore approximately 5.1 % of concrete, not including any Ca found in the aggregates.

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Recyclable calcium carbonate-based concrete: Utilizing calcium …

Following the CCUS approach, the re-utilization of cement-based concrete waste through a process known as 'mineral carbonation' has become a promising and widely implemented strategy [17, 19].It has been reported that >3 billion tons of recycled aggregates (RAs) from construction and demolition wastes are produced annually [20, 21], with an …

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Development of a process for producing high‐purity calcium …

The process consists of two main reactions; extraction of calcium in the form of calcium ions from waste cement powder in a water slurry by pressurized CO 2 (typically at …

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[PDF] Calcium Carbonate Cement: A Carbon Capture, …

A novel calcium carbonate cement system that mimics the naturally occurring mineralization process of carbon dioxide to biogenic or geologic calcium carbonate deposits was developed utilizing carbon dioxide-containing flue gas and high-calcium industrial solid waste as raw materials. The calcium carbonate cement reaction is based on the ...

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Urban concrete mines

Cold-sintered carbonated concrete waste fines: A calcium carbonate concrete block. Article Publication Date. 24-Jul-2024. COI Statement.

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Microstructure development of calcium carbonate cement …

Calcium carbonate has been used directly in the form of quarried blocks to form architectural columns and walls, crushed to form aggregate to be mixed in concrete, burned in kilns to make lime and cement, interground with clinker as a reactive extender, co-substituted for clinker along with calcined clay in LC 3 mixes [[3], [4], [5]], combined ...

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Efficient option of industrial wastewater resources in cement …

Efficient option of industrial wastewater resources in cement mortar application with river-sand by microbial induced calcium carbonate precipitation. Yi-Hsun Huang. Yi-Hsun Huang. 1 Department of Civil Engineering ... the urease activity of the mixer of cement and waste water was estimated. The porosity of the bicement mortar was measured ...

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Calcium Carbonate Cement: A Carbon Capture, Utilization, …

A novel calcium carbonate cement system that mimics the naturally occurring mineralization process of carbon dioxide to biogenic or geologic calcium carbonate deposits was developed utilizing carbon dioxide-containing flue gas and high-calcium industrial solid waste as raw materials. The calcium carbonate cement reaction is based on the polymorphic …

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The use of waste mussel shells as an aggregate replacement in concrete

The procedure performed is an eco-friendly solution to the problem of disposal of the shell by-products, since turning waste into a high value-added product like calcium carbonate is enabled.

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Production of carbon negative precipitated calcium carbonate from waste

Cement is a suitable source of calcium and can be recovered from waste concrete. The production of cement accounts for 9.5 % of global CO 2 emissions, however up to 50 % of the manufacturing emissions can be mitigated at the end of the …

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Synergizing Portland Cement, high-volume fly ash and calcined calcium

However, one challenge associated with replacing cement with calcium carbonate is its high loss on ignition (LOI) value. ... (Eds.), Woodhead Publishing Series in Civil and Structural Engineering, Waste and Byproducts in Cement-Based Materials, Woodhead Publishing (2021), pp. 439-480, 10.1016/B978-0-12-820549-5.00015-2. View PDF View article ...

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Use of waste calcium carbonate in sustainable …

This contribution illustrates the use of waste calcium carbonate, obtained from marble slurry (waste marble, WM), in sustainable cement materials alternative to Portland cement.

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Synthesis of nano-calcium carbonate from waste cement …

Mineral carbonation stands out not only as an effective method for reducing CO 2 emissions but also as a strategic approach to upcycling industrial waste. This study introduces a novel procedure for generating high-purity nano-calcium carbonate (nCaCO 3) from waste cement powder, deploying hydrochloric acid (HCl), and sodium hydroxide (NaOH), both obtained …

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From waste to resource recycled lime sludge: Sustainable …

This research focuses on recycling lime sludge as a calcium carbonate (CaCO 3) source in producing a low-clinker cementitious binder and other supplementary cementitious materials.The study comprises three main phases. In the first phase, raw lime sludge collected from the textile industry was analyzed for pH, metal content, anions, and microstructure …

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Recovery and carbonation of of calcium in waste …

This study addresses four research themes: (1) waste cement recovery from two types of waste concrete, (2) calcium extraction efficiency from waste cement by hydrochloric …

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Carbonated waste paste calcined clay cement with …

Modern concrete offers a significant potential for carbon capture, utilization and storage due to their alkaline nature. Herein, we combine the CO 2 mineralization in the waste cement paste (WCP) with calcined clay cement to develop a novel low-carbon cement—carbonated waste paste calcined clay cement (CWPC 3).Our results suggest that 1 kg WCP efficiently mineralizes …

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The drying shrinkage response of recycled-waste-glass …

The partial replacement of PC and MS by mineral admixtures, i.e., calcium carbonate and waste glass powders, reduces concrete drying shrinkage. A reduction of said contraction can be observed after five days of up to 36% in the case of dosage with calcium carbonate and glass powder of 28 and 7 µm of average particle size (D3) as mineral ...

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(PDF) Effect of Calcium Carbonate Replacement …

Three-dimensional XMT imaging was capable of displaying spatially heterogeneous alteration in cement pores, calcium carbonate precipitation in cement cracks, and preferential cement alteration ...

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Production of carbon negative precipitated calcium carbonate from waste

The objective here is to sequester CO2 through the production of PCC via the recovery and carbonation of calcium from waste cement. The calcium is suitable for mineral carbonation and can be ...

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Calcium Carbonate Concrete: Building on Recycling

Calcium carbonate concrete is made from waste concrete and CO2 from the air. How are these used to create this new building material? Concrete waste powder is put into water, and air bubbles are blown into this water to produce a calcium bicarbonate solution. The solution is flowed between the concrete waste particles in the container.

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Integration of Solid Waste Upcycling and Carbon …

Calcium carbonate polymorphs can be incorporated into cementitious materials to improve their rheological properties, hydration behavior, and mechanical performance, while amorphous …

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Toward Carbon-Neutral Concrete through Biochar–Cement–Calcium Carbonate …

The paper also addresses the possible compressive strength range of the biochar–cement–calcium carbonate composite material, along with other performance expectations. ... additional work on this from a CO 2 storage perspective is also unclear since 270 kg CO 2 can be sequestered if 1 tonne of waste cement is completely carbonated, ...

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High strength bio-concrete for the production of building

The production of bio-concrete is based on the process of microbially-induced calcium carbonate precipitation (MICP), in which calcium carbonate (CaCO3) is formed as a binder. Bio-concrete is a ...

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Calcium carbonate synthesis from waste concrete for …

This research article explains the synthesis and scale-up of calcium carbonate (CaCO 3) from waste concrete as calcium-rich material by an inorganic carbonation process.The operating parameters include S/L ratio, HCl concentration, contact time, …

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