The annual amount of concrete waste generated by demolition in Japan is 40 to 100 million tons (MLIT 2018), which means that 1.8 to 4.8 ... new calcium carbonate concrete (CCC) comprising a

3. Oyster shell as cement replacement in concrete. Research activities centered on the use of waste as a substitute for cement have been done due to declining natural supply and its environmental implications [46].The content of CaCO 3 exceeding 90% in sea shell are very similar to the calcium carbonate content of calcium dust …

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 … Expand. 106. Save.

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 …

@article{Ma2024UtilizingWC, title={Utilizing Waste Cement for Carbon Dioxide Sequestration and Capture: The Role of Water Content on the Growth of Calcium Carbonate}, author={Zihan Ma and Long Jiang and Yi Jiang and Peiliang Shen and Yong Tao and Jiangshan Li and Chi-sun Poon}, journal={ACS Sustainable Chemistry & …

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, and extraction pH were investigated.

The replacement of cement and silica fume with sustainable alternatives to RPC may provide significant benefits, however, there are challenges to overcome. In this study, calcium carbonate and ground waste glass powder were introduced as mineral mixtures to develop an environmentally friendly and cost-effective RPC mixture.

The mass loss after 500 °C account for 4.7% and it is due to the decomposition of calcium carbonate, because cement paste was exposed to CO 2 in atmosphere in the 6 ... Development of a process for producing high-purity calcium carbonate (CaCO 3) from waste cement using pressurized CO 2. Environ Prog, 24 …

The new cement system described is an environmentally sustainable alternative cement that can be carbon negative, meaning more carbon dioxide is captured during its manufacture than is emitted. A novel calcium carbonate cement system that mimics the naturally occurring mineralization process of carbon dioxide to biogenic or …

Calcium silicate based cementitious materials are well known by its reactivity with carbon dioxide to produce high early strength through carbonation curing. Since the early strength gain is due to the reaction between calcium silicates and carbon dioxide, carbonation cement can be formulated with calcium silicates of any polymorph with …

Calcium carbonate concrete is made from waste concrete and carbon dioxide from the air or industrial exhaust gases. It shows promise as a future construction material, especially in places where natural resources are limited. The modern world is built from concrete. Every tall building in every city on Earth uses the durable and versatile ...

Calcium carbonate polymorphs were synthesized in laboratory conditions with the same precursor materials and comprehensively characterized with various analytical techniques. The three polymorphs were then used as cement substitutes at 10 wt% and 20 wt% replacement levels. Hydration kinetics up to 7 d and phase …

Eggshell powder of various amounts, namely 5%, 10%, 15% and 20% by volume, was added as a replacement for ordinary Portland cement. The results showed that water-cured eggshell concrete greatly ...

1. Introduction. In cement production, the calcination of limestone accounts for the majority of CO 2 emissions (60 %) and the introduction of new cement produced from non-limestone must take into account the properties and applications of these materials, which will take more than ten years [1].Therefore another option to reduce …

The cement industry produces 5–8% of global CO 2 emissions. Several methods for reducing specific CO 2 emissions have been reported in the cement industry, including calcium looping, which uses the reversible reaction between calcination [calcium carbonate (CaCO 3) decomposition] and carbonation [CO 2 capture by calcium oxide …

A series of new low calcium CO2 sequestration cementitious materials (LCC) with different Ca/Si ratios were prepared by sintering waste concrete fine powder (WCP) and calcium carbide slag (CCS) at ...

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 ...

The use of mussel shell waste as a substitute for concrete components is an alternative that may reduce the dependency on conventional natural materials. ... have calcined the seashells at 650 and 850 °C to allow the conversion of Kaolin to Metakaolin without calcium carbonate degradation and the decomposition of calcium carbonate …

The main carbonation products are calcium carbonate, an alumina-silica gel and a C-S-H phase with a low Ca/Si ratio. Hydration curing following the carbonation transforms the silica-rich phase into a C-S-H phase typical of hydrated Portland cements. ... Material recycling process for waste concrete. Kagaku Kogaku Ronbunshu, 36 (2010), …

This study aims to review the potential for microbial calcium carbonate precipitation (MCP) as an effective method for environmental remediation and its application in construction restoration. This review aims to provide in-depth knowledge of microbial calcium carbonate precipitation through the concrete denitrification process. One of …

1. Introduction. Cement manufacturing is one of the most energy intensive industries in the world. The calcination of limestone and the combustion of fossil fuels, coupled by the sheer volume of cement produced has also made the industry among the highest emitters of carbon dioxide [[1], [2], [3]].The carbon emissions from cement …

For example, calcium sources can be derived from solid waste such as waste concrete [34, 35], slag [36], and fly ash [37], while carbon sources can be obtained from exhausted CO 2 from cement plants or power stations [38]. ... Another application of vaterite is calcium carbonate cement, which leverages the transformation of spherical …

Concrete slurry waste includes 30% aggregates and 70% hydration products, and the percentage of calcium hydroxide and calcium carbonate in the concrete slurry waste are 4.6–14.7% and 9–23.5%, respectively.

The waste soil also contains a large number of pebbles and a large amount of gravel, which is. Apparent morphology. For ease of presentation, "adding 3 % quicklime and 3 % ground calcium carbonate powder at the same time" is expressed as "3 + 3", and "0 + 3" represents the addition of 3 % ground calcium carbonate powder alone.

On one hand, it had been reported [40] that calcium carbonate would accelerate the hydration of C 3 A to form C-AFm at early ages. On the other hand, calcium carbonate provides effective ...

For example, flue gas containing CO 2 can be reacted with solid high-calcium industrial waste to generate a calcium carbonate cement 9. So, is it justified to describe calcium carbonate as dull ...

The ground calcium carbonate powder (GCCP) is composed of waste limestone powder (from the Xinlei Stone Material Co., ltd., China) and recycled bone powder (from the Yahan Biotechnology Co., ltd., China) according to the proportion of 5:1. The powder is sieved through a 200-mesh sieve and dried in an oven at 50 °C for 24 h …

Portland cement CEM I 42.5 R according to EN 197-1 containing Portland cement clinker, calcium sulfate and a small quantity of limestone was hydrated for 3 months at 40 °C and w/b = 0.4.

This study investigated the impact of temperature on the strength development of calcium carbonate concrete (CCC) comprising calcium carbonate and concrete waste. CCC exhibited its highest compressive strength when manufactured at temperatures between 60 and 70 °C, thereby demonstrating strengths 1.5 and 2.7 times greater than those …

Calcium carbonate which forms due to carbonation has a very low solubility and thus contributes significantly to clogging of the pore system, at least in the early stage of carbonation [17], [19]. ... Carbonation of cement-waste mixtures modifies the microstructure, increases the strength and may decrease the leaching of metals. ...