alkali aggregate reactionthe co balance of concrete in a life cycle perspective
EXPANSION DUE TO ALKALI-SILICA REACTION (ASR) OF GLASS
Table 2The standard concrete mix for BS MIX CONSTITUENT by volume 20-10mm Aggregate 10-5mm Free Water Fine 22.2 22 16.5 16.5 22.8 Adjustment ofAlkali Content The alkali content of the concrete was adjusted by adding potassium sulfate to the mix water so that each mix had the same alkali content as a mix prepared from cement with an
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Canadian Civil Engineer Summer 2015 by Annex Business
"Reactivity of reclaimed concrete aggregate produced from concrete affected by alkali–silica reaction " Cement Concrete Research 40(4) . 29 3 29 PM
Get PriceWhat Is Alkali Aggregate Reaction In Concrete Civil Planets
Alkali-Aggregate Reaction The chemical reaction between the concrete aggregates and alkali hydroxide with the help of environmental moisture that leads to cracks on the concrete surface over a period is known as the alkali-aggregate reaction. The appearance of crack seems like a random map as shown in the above picture.
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R. Douglas HootonDepartment of Civil Mineral Engineering
Hooton R.D. "Use of Ternary Cement Systems to Optimize Durability of Concrete Exposed to Chlorides and Alkali-Silica Reactivity" Proceedings Seminar on Durability and Life-Cycle Modeling of Concrete Structures- 2006 Hiroshima Japan Sept. 2006 pp. 3-12.
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Frontiers Gender Balance in Construction Material
Sep 17 2020 · Indeed it is well known that the manufacturing of 1 ton of Portland cement implies the emission of almost the same amount of CO 2 in atmosphere although during its entire life cycle carbonation of cement allows for CO 2 sequestration (for a cumulative amount of 4.5 GtC measured between 1930 and 2013) and determines an adjustment of CO 2
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Uses Limestone cycle manufacture cement concrete glass
Uses of limestone and products made from limestone and ceramic materials from clay. What do we use limestone for Quite a lot things actually more than you may think Cement is produced by roasting a mixture of powdered limestone with powdered clay in a high temperature rotary kiln at 1400 o C.. Cement is a mixture of calcium silicate and aluminium silicate.
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R. Douglas HootonDepartment of Civil Mineral Engineering
Hooton R.D. "Use of Ternary Cement Systems to Optimize Durability of Concrete Exposed to Chlorides and Alkali-Silica Reactivity" Proceedings Seminar on Durability and Life-Cycle Modeling of Concrete Structures- 2006 Hiroshima Japan Sept. 2006 pp. 3-12.
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Integrated Materials and Construction Practices for
Aggregate Durability and Alkali-Aggregate Reactivity. Aggregates containing certain minerals (table 3-12) can react with alkali hydroxides in concrete to form a gel that expands when exposed to moisture. This reaction and expansion eventually results in cracking in the aggregate and the concrete
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James K. Wight James G. MacGregor Reinforced Concrete
James K. Wight James G. MacGregor Reinforced Concrete Mechanics and Design 6th Edition Prentice Hall (2011)
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Development of a Sustainable Concrete Waste Recycling System
recycled coarse aggregate concrete is free from al-kali-silica reaction. The alkali-silica reaction is regarded as the strictest quality control item of all the processes relevant to re-cycled coarse aggregate concrete and a high rate of examination frequency is required. Table 4 Example of quality standards of recycled coarse aggregate.
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R. Douglas HootonDepartment of Civil Mineral Engineering
Hooton R.D. "Use of Ternary Cement Systems to Optimize Durability of Concrete Exposed to Chlorides and Alkali-Silica Reactivity" Proceedings Seminar on Durability and Life-Cycle Modeling of Concrete Structures- 2006 Hiroshima Japan Sept. 2006 pp. 3-12.
Get PriceIOP Conference Series Materials Science and Engineering
The problem of alkali-silicate interaction typical for traditional Portland cement and glass phase is solved through the use of magnesia binder. Samples on Portland cement and magnesia binder were obtained the aggregate content was varied. Some aggregate fractions were used to obtain high packing density in
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Alkali Content of Concrete Mix Water and Aggregates
concrete in kg/m3. 4. The alkali content of the water already present in the aggregate when batched is included in the alkali contribution from the aggregate. Alkali Contribution from Aggregates Where it Comes From Aggregates can contribute alkalis from two sources release from minerals within the rock and marine salt contamination on the
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Co(III)/Alkali-Metal(I) Heterodinuclear Catalysts for the
Life-cycle assessment shows that polyols with just 20 wt CO 2 content (i.e. imperfectly alternating polymers) display a ∼20 reduction in green-house gas emissions and fossil fuel consumption compared to currently used petrochemicals. High molar mass polycarbonates are also explored as toughened plastics elastomers and adhesives.
Get PriceFrontiers Gender Balance in Construction Material
Sep 17 2020 · Indeed it is well known that the manufacturing of 1 ton of Portland cement implies the emission of almost the same amount of CO 2 in atmosphere although during its entire life cycle carbonation of cement allows for CO 2 sequestration (for a cumulative amount of 4.5 GtC measured between 1930 and 2013) and determines an adjustment of CO 2
Get Price
EXPANSION DUE TO ALKALI-SILICA REACTION (ASR) OF GLASS
Table 2The standard concrete mix for BS MIX CONSTITUENT by volume 20-10mm Aggregate 10-5mm Free Water Fine 22.2 22 16.5 16.5 22.8 Adjustment ofAlkali Content The alkali content of the concrete was adjusted by adding potassium sulfate to the mix water so that each mix had the same alkali content as a mix prepared from cement with an
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Concretes with Photocatalytic Activity IntechOpen
Oct 30 2015 · This chapter is a short review about the modified concretes with photocatalytic activity. In the beginning the photocatalysis process is explained the authors are focused on the mechanism of organic contamination and nitrogen oxide decomposition. Next the three main methods for concretes modification are presented the first group is when the concrete is covered by thin layer of TiO2
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Sustainability Aspects in Mass Concrete SpringerLink
May 24 2018 · Life cycle assessment of applying CO 2 post-combustion capture to the Spanish cement production. The CO 2 balance of concrete in a life cycle perspective. Danish Technological Institute (DTI). In Proceedings of the 7th International Conference on Alkali-Aggregate
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Co(III)/Alkali-Metal(I) Heterodinuclear Catalysts for the
Life-cycle assessment shows that polyols with just 20 wt CO 2 content (i.e. imperfectly alternating polymers) display a ∼20 reduction in green-house gas emissions and fossil fuel consumption compared to currently used petrochemicals. High molar mass polycarbonates are also explored as toughened plastics elastomers and adhesives.
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(Sprayed) concrete production in life cycle assessments a
Research question 1 What is the life cycle performance of sprayed concrete The search performed for sprayed concrete confirmed our hypothesis and clearly pointed to a gap our final sample of papers was composed of only four studies (Huang et al. 2015 Pretot et al. 2014 Stripple et al. 2016 Amin Hosseini et al. 2016).Detailed information on the amount of papers remaining after each
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Concrete bridges in sustainable development Proceedings
In 2000 global cement production was some 1600 million tonnes requiring the energy content of 152 million tonnes of fuel oil and 176 million MW of electrical power in its manufacture.2 Furthermore each tonne of concrete produced generated between 1·0 and 1·2 t of carbon dioxide (CO 2) a key greenhouse gas responsible for climate
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Innovative concretes for low-carbon constructions a
When an electromagnetic radiation with energy equal or higher to that of the band gap (h v ≥ E bg) is absorbed by the semiconductor an electron–hole pair is formed (case of TiO 2 in eq. 1).Such pairs can be used to produce electric energy (solar cells) to initiate a chemical reaction (photochemical catalysis) or even to produce an effective change on the material surface
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Thermochemical CO2 Hydrogenation to Single Carbon
This can result in an advantageous balance of the environmental impacts. In simple words though CO 2 conversion to chemicals cannot form a carbon sink over the life cycle of the products which eventually produces an equivalent amount CO 2 at the cycle s end it can lead to more environmentally benign production processes.
Get PriceAccelerated Carbonation Curing as a Means of Reducing
Jun 09 2020 · Concrete pipes are among the different types of concrete products that utilize dry mixes with zero slump. Accordingly carbonation curing of concrete pipes has been investigated . Samples were cast with a water-cement ratio (w/c) of 0.26 with cement coarse aggregate and fine aggregate contents of 426 853 and 853 kg/m 3.
Get PriceThermochemical CO2 Hydrogenation to Single Carbon
This can result in an advantageous balance of the environmental impacts. In simple words though CO 2 conversion to chemicals cannot form a carbon sink over the life cycle of the products which eventually produces an equivalent amount CO 2 at the cycle s end it can lead to more environmentally benign production processes.
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CNALithium-based concrete sealing solidifying
The invention discloses a lithium-based concrete sealing solidifying agent. The lithium-based concrete sealing solidifying agent comprises the following components in percentage by weight 50.0-90.0 percent of lithium silicate sol 0.01-1.0 percent of wetting and dispersing agent 0.01-1.0 percent of defoaming agent 0.01-1.0 percent of permeability-resistant agent 0.0-10.0 percent of
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Decarbonizing the cementitious materials cycle A whole
The CO 2 absorbed by mortar and concrete during end‐of‐life depends on how these materials are processed ranging from ∼1 CMs cycle emissions if landfilled to ∼10 if crushed and downcycled as sub‐base (Pade Guimaraes 2007). Therefore CMs cycle emissions can be reduced by optimizing end‐of‐life processing to enhance
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Aspects 2 to 4 also support its sustainability and low life-cycle costs. The last aspect illustrates that the most energy intensive component of concrete the cement in relatively low dosages (10 m/m) may turn waste into a building material i.e. bringing waste materials (back) in the building life cycle.
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Karel Van AckerTRANSfarm
This paper aims at filling this gap by using a Consequential Life Cycle Assessment (C-LCA) for the case of green concrete made from Stainless Steel Slag (SSS) with a focus on the Flemish market (in Belgium) for construction blocks. For the present study a green concrete block was produced using SSS as OPC replacement.
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