Granite quarry waste as a future eco-efficient supplementary cementitious material (SCM): Scientific and technical considerations

Medina, Gabriel Alfonso Suárez; Bosque, I.F. Sáez del; Frías, Moisés; Rojas, M.I. Sánchez de; Medina, César

doi:10.1016/j.jclepro.2017.02.048

Cited by 107 publications

(41 citation statements)

References 39 publications

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“…The Si replacement by Al in the gel led to lower Ca/Si ratios (1.72). The foregoing was consistent with premises set out by other authors as well as with earlier results for the CS/Ca(OH) 2 system and cements containing granite sludge, in which the addition of pozzolans led to lower Ca/Si ratios than found in OPC.…”

Section: Resultssupporting

confidence: 92%

Durability and chromatic behavior in cement pastes containing ceramic industry milling and glazing by‐products

et al. 2018

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The decay in mortar and concrete induced by extremely aggressive agents is normally the result of the agent‐binder reaction. Cement composition and characteristics therefore determine the durability of the mortars and concretes of which they form part. The existing legislation envisages the use of different types of additions in cement, which have a direct effect on the durability of elements in buildings and civil works. This study addressed the inclusion of ceramic industry milling and glazing sludge as an active addition in cement. The reuse of this industrial waste is consistent with environmental policies that seek to reduce or eliminate spoil heaps by recycling industrial waste and byproducts as raw materials, in keeping with circular economy principles. The research conducted makes an innovative contribution to the valorization of this waste, and highlights the resistance of blended cement pastes to chemical agents, further to the Koch‐Steinegger method. Water‐induced decay in freeze/thaw situations was also studied. The processes involved were identified by analyzing the mineralogical variations detected with X‐ray diffraction, the morphological alterations observed with scanning electron microscopy and the mercury porosimetric findings on pore size distribution. The suitability of these binders for aesthetically demanding applications was also explored by measuring the color in pastes exposed to aggressive chemical agents. For the first time, a correlation was established between color parameters and the formation of the reaction products generated during chemical attack.

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Section: Resultssupporting

confidence: 92%

Durability and chromatic behavior in cement pastes containing ceramic industry milling and glazing by‐products

et al. 2018

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“…The chemical composition and mineralogical compounds of MP and commercially used ASTM type I PC are presented in Table . To compare, the chemical properties of a kind of granite powder and a kind of marble powder is presented in Table . In addition, chemical and physical properties of MP based on ASTM C618 reported in Table .…”

Section: Materials Propertiesmentioning

confidence: 99%

“…Moreover, the usage of about 10% zeolite increases the lifespan of concrete and therefore reduces the amount of global warming . The use of granite sludge in the range of 10 to 20% of the cement clinker substitute is a well‐blended cement and compliant with the European standard . The use of fly ash and metakaolin as SCM, make self‐compacting concrete more efficient with important reductions in costs and environmental impact .…”

Section: Introductionmentioning

confidence: 99%

Introduction of a mineral powder as a type of natural cementitious material in concrete: An experimental program

Fazilati

Golafshani

2019

Structural Concrete

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The principal air pollution within the concrete enterprise is cement in charge of roughly 5-7% of manufactured CO 2 emissions. For reducing CO 2 emissions and improving concrete properties, new types of natural cementitious materials have been served in concrete throughout the last two decades. In this study, a mineral powder (MP) as a type of supplementary cementitious material has been introduced and the chemical and physical properties of this MP and mechanical properties of the produced concrete were investigated. In this regard, the total number of 24 concrete mixes with 0 to 40% replacement of Portland cement (PC) with MP was designed. Concrete samples were tested for compressive, flexural, splitting tensile strengths, and elastic modulus at the age of 7, 28, 42, and 90 days. The experimental results indicate that the maximum compressive, flexural, and splitting tensile strengths are obtained by replacing about 5% PC with MP. Finally, the amount of CO 2 emission reduction for concrete specimens containing MP was evaluated. K E Y W O R D S CO 2 emissions, mechanical properties, mineral powder, supplementary cementitious material

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“…At lower frequencies, a very intense band at around 1420 cm −1 generated by CO 3 2− groups denoted the presence of calcium carbonate, primarily as calcite, although a shoulder at 1470 cm −1 attested to the existence of aragonite. The absorption bands at around 875 cm −1 , assigned to calcite, and 850 cm −1 , to aragonite, supported this interpretation.…”

Section: Ft-ir and Micro-raman Findingsmentioning

confidence: 99%

“…Ordinary Portland cements (OPCs) are known to be scantly resistant to aggressive agents such as chlorides, sea water, sulfates and CO 2 , which, when reacting with the hydrated phases in cement, induce expansion, cracking, strength loss, a decline in stiffness, and disintegration [1][2][3]. Active additions are known to raise the durability of Portland cements.…”

Section: Introductionmentioning

confidence: 99%

Carbonation-Induced Mineralogical Changes in Coal Mining Waste Blended Cement Pastes and Their Influence on Mechanical and Microporosity Properties

et al. 2018

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Abstract:The worldwide pursuit of new eco-efficient pozzolans is ongoing. Kaolinite-based waste is an eco-friendly source of recycled metakaolinite, a highly pozzolanic product. In this study, a blended cement paste containing 20% activated coal waste (ACW) was exposed to a 100% CO 2 atmosphere at 65% RH for 7 days. The variations in its phase composition and strength were studied and compared to an OPC control. Both pastes were cured for 28 days prior to the carbonation test. Reaction kinetics were assessed using XRD, SEM/EDX, TG/DTG, FT-IR, Micro-Raman spectroscopy, pore solution pH and the cumulative carbonated fraction. The blended cement carbonated 68% faster than the control. While portlandite carbonation was the main reaction in both cements, decalcification was also observed (more intensely in the 20% ACW paste) in other hydraulic calcium phases (C-S-H gel, monocarboaluminate (C 4 AcH 12 ), ettringite and tetracalcium aluminate (C 4 AH 13 ). The end product of this reaction was calcium carbonate, mainly in the form of calcite, although traces of aragonite and amorphous carbonate were also detected. Compressive strength values rose with accelerated carbonation time and pore size reduction in both cement pastes.

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Granite quarry waste as a future eco-efficient supplementary cementitious material (SCM): Scientific and technical considerations

Cited by 107 publications

References 39 publications

Durability and chromatic behavior in cement pastes containing ceramic industry milling and glazing by‐products

Durability and chromatic behavior in cement pastes containing ceramic industry milling and glazing by‐products

Introduction of a mineral powder as a type of natural cementitious material in concrete: An experimental program

Carbonation-Induced Mineralogical Changes in Coal Mining Waste Blended Cement Pastes and Their Influence on Mechanical and Microporosity Properties

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