Industrial ecology - Cement, concrete, aggregates

serve the community by recycling waste that would otherwise need to be processed and eliminated. In 2007, Lafarge recycled over 7.7 million tons of biomass, waste and. by-products from industry and agriculture. This reduced the amount of carbon dioxide (CO2) released into the atmosphere by more than 10 million tons.

(PDF) Recovery of residual anhydrous clinker in finely

2020/04/01 · Unlike recycling of aggregates, utilization of sub-sieve fractions from recycled concrete has not yet been adopted in the construction industry. In this study, we investigate the possibility of ...

Expanding Our Recycling-Oriented Business Model

Recycling-Oriented Business Model Overview of our Recycling-Oriented Business Model. The Mitsubishi Materials Group is a complex corporate entity encompassing a wide range of technologies and expertise, from resources upstream to materials midstream to processed products downstream.

Recycling Construction and Demolition Wastes as Building

Recycling Construction and Demolition Wastes as Building Materials A Life Cycle Assessment Sylvain Guignot, Solene Touz` ´e, Fr ´ed eric Von der Weid, Yannick M´ enard,´ and Jacques Villeneuve Summary The present study addresses the topic of recycling materials from construction and de-

Portland clinker from by-products and recycled materials out

Finally by-products out of common concrete production in the form of concrete sludge and waste materials out of demolished concrete in the form of fines fractions were investigated as raw material for Portland clinker production. Common concrete represents the biggest market as a function of cement consumption and is therefore a logical choice ...

Recycling of waste as an alternative raw material and fuel in

RECYCLING OF WASTE AS AN ALTERNATIVE RAW MATERIAL AND FUEL IN CEMENT MANUFACTURING Hiroshi Uchikawa and Shunsuke Hanehara INTRODUCTION With the advancement of industrial activity and improvement of living standards, the amount of waste generated by society has continuously increased and the treatment and disposal of waste is a serious social problem.

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Recycling of Moroccan coal gangue in the elaboration of a

Recycling of Moroccan coal gangue in the elaboration of a Portland clinker D. Belkheiria,b, A. Diouria, M. Taibib*, O. Sassi b, J. Arideb a Université Mohammed V, Laboratoire de chimie du solide appliquée, Faculté des sciences, Rabat, Maroc (Morocco).

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UCLA researchers turn carbon dioxide into sustainable concrete

Mar 14, 2016 · After all, concrete is everywhere — on our roads, our driveways, in our homes, bridges and buildings. For the past 200 years, it’s been the very foundation of much of our planet. But the production of cement, which when mixed with water forms the binding agent in concrete, is also one of the biggest contributors to greenhouse gas emissions.

Why Is Gypsum Added to Cement?

The terms cement and concrete are used interchangeably, although cement is actually an ingredient of concrete. Gypsum is often added to cement and concrete to slow down the drying time. Cement dries quickly and retarding that process allows workers to pour the mixture into the various forms or frames needed.

US7258737B2 - Method for recycling concrete waste

A method for recycling concrete waste includes the steps of: a) heating the concrete waste to provide a measure of fragility to the concrete waste; b) milling and sieving the heated concrete waste to separate coarse aggregate from the concrete waste; and c) milling and sieving a remaining portion of the concrete waste remaining after separation of the coarse aggregate to separate the remaining ...

Difference between Clinker and Cement

Cement is produced by grinding clinker (added with different active ingredients to achieve the desired properties of cement) into a fine powder. 4 The composition of a typical good quality clinker for general use: 37-72% of 3CaO.SiO

Reducing cement’s carbon footprint is critical to climate

Nov 15, 2019 · As the concrete hardens, the carbon from the carbon dioxide reacts with the concrete to become a mineral, effectively reducing the need for cement without compromising the concrete’s strength or ...

Alternate Cementitious Materials

Approximately 14 million tons of cement kiln dust are generated yearly in the United States with 9 million tons being reused into clinker manufacturing and 5 million tons discarded (Detwiler et al., 1996). Cement kiln dust varies as the raw material, clinker, and type of operation varies; however, it consists of unreacted raw feed, partially ...

Alternative Fuel Use in Cement Manufacturing

Alternative Fuel Use in Cement Manufacturing 6 1.2 Emissions from cement production More than 50% of the total CO2 from cement production results from the chemical reaction that converts limestone into clinker, the active ingredient in cement. This chemical reaction accounts for approximately 540 kg CO2 per tonne of clinker.

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Sulphates in completely recyclable concrete and their

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Use of recycled glass as a raw material in the manufacture of

The experimental results show that the addition of the glass into cement raw mix (1) results in the formation of more liquid phase between 950°C to 1250°C compared with conventional raw meals; (2) decreases C 3 S content in the clinker; and (3) increases NC 8 A 3 content

Can concrete be recycled back into its original cement form

Nov 17, 2017 · Concrete is made by mixing cement with coarse and fine aggregates with water(nowadays we also use chemical and mineral admixtures). The cement reacts with water and ...

Graphene Oxide Enables The Clinker-Free Concrete

2020/03/14 · In the context of recycling fly ash from hazardous waste stream and reducing CO2 emissions, the alkali-activated fly ash geopolymer is being considered as one of the main treatments to solidify fly ash and as a

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Recovery of residual anhydrous clinker in finely ground

Unlike recycling of aggregates, utilization of sub-sieve fractions from recycled concrete has not yet been adopted in the construction industry. In this study, we investigate the possibility of recovering residual anhydrous clinker

RECYCLING MUNICIPAL SOLID WASTE INTO

RECYCLING MUNICIPAL SOLID WASTE INTO CONCRETE PAVING BLOCKS TOMARU, Keiji Keiji Tomaru: Engineer, Research & Development Dept. S-BIC COMPANY LTD, 250, Kashiwagizawa, Misati-machi, Takasaki-shi ...

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Clinker Mobile Crusher For Concrete Waste

Concrete Recycling Machine. The mobile crushing plant can be equipped with different machines such as jaw crusher impact crusher cone crusher vibrating feedervibrating screen and so on It can effectively deal with concrete scrap bricks tiles scrap steel wood and other construction solid waste transforming them into recycled coarse aggregate and fine aggregate

Formation Kinetics of Regenerated Cement Clinker

2014/12/01 · Regenerated cement clinker is fabricated by recycling concrete powder added with a small amount of correction raw materia. Through the Gentling equation computing and microstructure morphology observation, the apparent-5 s-1

INVESTIGATION INTO LOWERING CEMENT CLINKER CONTENT USING

INVESTIGATION INTO LOWERING CEMENT CLINKER CONTENT USING AVAILABLE MATERIALS Qiwei Cao, Candidate for the Master of Science Degree University of Missouri-Kansas City, 2012 ABSTRACT Reducing cement clinker with mineral addition has been considered an efficient way of saving energy, lowering CO2 footprint of cement and concrete industries. The ...