An investigation on the recycling of hydrated cement from concrete demolition waste

Gastaldi, Daniela; Canonico, Fulvio; Capelli, L.; Buzzi, Luigi; Boccaleri, Enrico; Irico, Sara

doi:10.1016/j.cemconcomp.2015.04.010

Cited by 100 publications

(34 citation statements)

References 20 publications

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“…On the other hand, efforts have been dedicated to designing lowcarbon cement. Incorporation of industrial wastes, such as, waste glasses (Shi and Zheng, 2007), recycled concrete waste (Gastaldi et al, 2015;Oh et al, 2014), oil-based mud (Abdul-Wahab et al, 2016;Bernardo et al, 2007), arc furnace steel slag (Bernardo et al, 2007;Iacobescu et al, 2011) and contaminated soil (Navia et al, 2006) into the clinker process, are found to be feasible to reduce the CO 2 emissions of cement manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Modeling the dynamic mechanism between cement CO2 emissions and clinker quality to realize low-carbon cement

Cao

Shen

Zhao

et al. 2016

Resources, Conservation and Recycling

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a b s t r a c tTo devise low-carbon cement clinker product, in-depth knowledge about the variation mechanism of cement clinker CO 2 emissions is the prerequisite. The determinants of cement clinker CO 2 emissions in Chinese cement industry have been inquired by several researches recently. However, the impacts and abatement effect of clinker quality on cement clinker CO 2 emissions have not been identified yet. In technological sense, there lacks an integrated quantitative model that can elucidate the dynamic mechanism between cement clinker CO 2 emissions and clinker quality. To fill this gap, this paper devises a CO 2 emission accounting framework integrated with optimization model to explore the dynamic mechanism between cement clinker CO 2 emissions and clinker quality. Based on survey data of 2 typical cement clinker production lines in China, the accounting framework is validated with measured data. Through numerical simulation within this framework, a set of sensitivity analysis is conducted. The results indicate that if the target KH (lime saturation ratio) of both production lines climb from −5% to +5%, the process CO 2 emission factor will give rise to an increase of about 16.4 and 14.8 kg CO 2 /t clinker, respectively. With the same variation, the fuel CO 2 emission factors of two production lines will gain 17.2 and 13.7 kg CO 2 /t clinker, respectively. Obviously, controlled decrease of clinker quality can reduce CO 2 emission of clinker manufacturing. The results of sensitivity analysis are robust and highlight the remarkable role of clinker quality in both process and fuel emissions. Besides, the integrated framework can provide in-depth investigation into the dynamic mechanism between CO 2 emissions and the other determinants. Using this framework, cement plants or industry can develop optimal clinker quality standards on a quantitative basis to achieve low-carbon clinker.

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Section: Introductionmentioning

confidence: 99%

Modeling the dynamic mechanism between cement CO2 emissions and clinker quality to realize low-carbon cement

Cao

Shen

Zhao

et al. 2016

Resources, Conservation and Recycling

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“…Other studies [16,17] have shown that it is possible to use the RCP as an alternative to conventional materials, primarily as a source of SiO 2 and in some cases, because of high content of CaO, as an alternative to limestone. The homogenization phase must be adjusted to the specific chemical composition of any RCP, since homogenization directly affects the production rate, particle size, and the chemical composition of cement [14].…”

Section: The Rcb As a Bindermentioning

confidence: 99%

“…Gastaldi et al [16] produced a cement clinker made by combining the RCP with limestone and schist. They concluded that the mineralogical composition and a subsequent lack of C 3 S prevents the use of the RCP on its own, because of its inappropriate proportions of CaO and SiO 2 .…”

Section: The Rcb As a Bindermentioning

confidence: 99%

Properties and Microstructure of Cement Paste Including Recycled Concrete Powder

Topič¹,

Prošek²

2017

Acta Polytech

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Abstract. The disposal and further recycling of concrete is being investigated worldwide, because the issue of complete recycling has not yet been fully resolved. A fundamental difficulty faced by researchers is the reuse of the recycled concrete fines which are very small (< 1 mm). Currently, full recycling of such waste fine fractions is highly energy intensive and resulting in production of CO 2 . Because of this, the only recycling methods that can be considered as sustainable and environmentally friendly are those which involve recycled concrete powder (RCP) in its raw form. This article investigates the performance of RCP with the grain size < 0.25 mm as a potential binder replacement, and also as a microfiller in cement-based composites. Here, the RCP properties are assessed, including how mechanical properties and the microstructure are influenced by increasing the amount of the RCP in a cement paste (≤ 25 wt%).

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“…On the contrary, fine recycled concrete aggregates are less useful as aggregates in concrete as they can be highly detrimental for what concern strength, workability and durability [10]. Therefore, at present, recycling industry has a very limited interest in fine concrete waste, even if they account at least for about the 30% of the entire building material waste [11]. Silica fume, a kind of pozzolanic material is used in RPC as a fine aggregate to play a micro filling role in no heat curing, however, because of the high price, silica fume is normally replaced by other pozzolanic material [12].…”

Section: Introductionmentioning

confidence: 99%

Properties of RPC with Calcium Carbonate Concrete Waste Powder

Sui

Qiao

Tian

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Calcium carbonate concrete is a normally concrete in the area with rich limestone. With the heavy use, a large of Calcium carbonate concrete waste is generated, how to reuse the waste is an important problem. The generation of reactive powder concrete (RPC) with silica fume is relative more expensive than normal concrete. Using the calcium carbonate concrete waste instead of silica fume in RPC can realize the recycling of construction and demolition waste, moreover, the high price of RPC manufacture can be decreased. The study mainly focused on the mechanical properties and durability as well as the microstructure of RPC with calcium carbonate concrete waste powder (CCWP) instead of silica fume, the results confirmed that the mechanical strengths of 3, 7, 28 days of RPC with CCWP did not obviously decrease, freezing and thawing test could attain to 500 recycles without obvious destruction and carbonation did not happen after 28 days. RPC with CCWP had no more amorphous material and good crystallinity, its microstructure was dense as that of RPC without CCWP.

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An investigation on the recycling of hydrated cement from concrete demolition waste

Cited by 100 publications

References 20 publications

Modeling the dynamic mechanism between cement CO2 emissions and clinker quality to realize low-carbon cement

Modeling the dynamic mechanism between cement CO2 emissions and clinker quality to realize low-carbon cement

Properties and Microstructure of Cement Paste Including Recycled Concrete Powder

Properties of RPC with Calcium Carbonate Concrete Waste Powder

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