Cement Concrete Technology on Road Construction
Typical retarders sugars sucrose glucose sodium gluconate citric acid and tartaric acid Admixtures –Retarders Functions Risks Delay cement hydration process Risk of bleeding and segregation with too much retarders Offsets accelerating effects of hot weather on concrete setting time Sensitive to cement properties •Gypsum content
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Effect of tartaric acid on the early hydration of NaOH
This study investigated the influence of tartaric acid (TA) on the early hydration of NaOH-activated ground-granulated blast-furnace slag (GGBS) paste. Early hydration process of the paste with or without TA was characterized by the hydration heat using an isothermal calorimeter. In addition inductively coupled plasma spectroscopy X-ray diffraction Fourier transform IR spectroscopy and
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Cement Hydration Inhibition with Sucrose Tartaric Acid
Sep 07 2006 · Tartaric acid is the most effective at retarding C3A hydration and ettringite formation while sucrose and the lignosulfonate accelerate ettringite formation but are more effective at retarding C3S hydration.
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Strength and Durability Properties of Concrete with Starch
Jul 14 2015 · Cement hydration inhibition with sucrose tartaric acid and Lignosulfonate Analytical and Spectroscopic Study. Industrial and Engineering Chemistry Research 45
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Maximilienne Giannelli Ph.D. Reston Finnegan
"Cement Hydration Inhibition with Tartaric Acid Sucrose and Lignosulfonate An Analytical and Spectroscopic Study " Industrial Engineering Chemistry Research 2006. Coauthor. "Determination of the Mode and Efficacy of the Cross-Linking of Guar by Borate Using MAS 11B NMR of Borate Cross-Linked Guar in Combination with Solution 11B NMR of
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Effect of carboxylic group on the compatibility with
Sep 12 2018 · Cement slurries were prepared in accordance with the test procedure set out in API Recommended practice for testing well cements 10B 2014 Dynamic retarder exchange as a trigger for Portland cement hydration. Cem. Concr. 2006 Cement hydration inhibition with sucrose tartaric acid and lignosulfonate analytical and spectroscopic study
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A Study on the Reduction in Hydration Heat and Thermal
Early prevention methods in massive concrete structures to control the heat of hydration and consequently the development of cracks due to thermal expansion are important subjects since these cracks may compromise structural integrity. In the present study the sugarcane residues in massive concrete were used in order to investigate the reduction in the heat of hydration the thermal
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Cement hydration inhibition and crosslinking in the guar
Reactions with tartaric acid also forms a calcium complex on top of the aluminate phases. In contrast sucrose appears to act directly on the silicate phases actually accelerates the reactions of the aluminate phases. Cement hydration inhibition and crosslinking in the guar-borate system Bishop Maximilienne Abstract. The hydration of
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PAPER OPEN ACCESS Effect of citric acid on setting-time
The additives that can be used as retarders include sugar sucrose sodium gluconate glucose citric acid and tartaric acid 1 . The addition of sugar to the concrete can extend the optimum initial seting time of the concrete. In the variation of 0 to 0.45 the optimum length of the initial seting time continues to increase 1 .
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Effect of carboxylic group on the compatibility with
Sep 12 2018 · Cement slurries were prepared in accordance with the test procedure set out in API Recommended practice for testing well cements 10B 2014 Dynamic retarder exchange as a trigger for Portland cement hydration. Cem. Concr. 2006 Cement hydration inhibition with sucrose tartaric acid and lignosulfonate analytical and spectroscopic study
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Methods and compositions for reclaiming concreteJustia
1--retarding the hydration of the unused portion of concrete returned from a job site by adding within 0.5 to 7 hours preferably 1 to 4 hours a retarding agent which is a chelating agent for calcium e.g. nitrilotris (methylene) tris phosphonic acid to the concrete to retard hydration for normally an additional 12 to 90 hours preferably
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Retarders slow the hydration of concrete and are used in large or difficult pours where partial setting is undesirable before completion of the pour. Typical polyol retarders are sugar sucrose sodium gluconate glucose citric acid and tartaric acid. Mineral admixtures and blended cements
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1. IntroductionHindawi
The effects of SG on cement hydration behaviors and retarding mechanism have not been fully understood and several studies are mentioned in this paper 15 . 2-s2. 15 Bishop M. Barron A. R. Cement hydration inhibition with sucrose tartaric acid
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Materials Free Full-Text Influence of Cementitious
Retarding admixtures are commonly used in hot weather concreting and when ready mixed concrete should be transported for a long distance. Sucrose (sugar) is a well-known cement set retarder 1 2 3 4 5 . Sucrose retards cement hydration by poisoning nucleation sites for calcium silicate hydrate (C–S–H) 3 6 . This poisoning effect prevents
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acs_neworleans2000Rice University
Tartaric acid sucrose and organophosphonates retard cement hydration. The effects of these retarders on the hydration of the main components of Portland Cement and the formation of ettringite were investigated in order to gain insight into the different mechanisms of hydration inhibition.
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Retarders retarded water reducers and retarded superplasticizers can be used for mass concrete roller compacted concrete concrete constructed
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At Last The Secret To CONCRETE PATIO Is Revealed
Retarders sluggish the hydration of concrete and are Utilized in large or tricky pours where by partial setting ahead of the pour is comprehensive is unwanted. Standard polyol retarders are sugar sucrose sodium gluconate glucose citric acid and tartaric acid.
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A Study on the Reduction in Hydration Heat and Thermal
Early prevention methods in massive concrete structures to control the heat of hydration and consequently the development of cracks due to thermal expansion are important subjects since these cracks may compromise structural integrity. In the present study the sugarcane residues in massive concrete were used in order to investigate the reduction in the heat of hydration the thermal
Get Price
Maximilienne Giannelli Ph.D. Reston Finnegan
"Cement Hydration Inhibition with Tartaric Acid Sucrose and Lignosulfonate An Analytical and Spectroscopic Study " Industrial Engineering Chemistry Research 2006. Coauthor. "Determination of the Mode and Efficacy of the Cross-Linking of Guar by Borate Using MAS 11B NMR of Borate Cross-Linked Guar in Combination with Solution 11B NMR of
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In situ investigation of phosphonate retarder interaction
In situ powder X-ray diffraction was used to examine the hydration of API Class H cement slurries with a water-to-cement ratio of 0.394 at 66 93 121 and 177 C under autogenous pressure in the presence of varying amounts of the additives tartaric acid modified lignosulfonate and AMPS (2-acrylamido-2-methylpropanesulfonic acid) copolymer.
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The 23 types of Concrete Admixtures Additives used in Concrete
③ Hydroxy carboxylic acid and its salt retarders such as tartaric acid sodium tartrate potassium sodium tartrate lactic acid malic acid citric acid sodium citrate salicylic acid etc. ④ Retarder for polyhydric alcohol and other substances polyvinyl alcohol cellulose ether.
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Admixtures of ConcreteUltimate GuideConstruction How
Apr 08 2020 · Hydroxycarboxylic acids such as citric acid tartaric acid salicylic acid heptonic acid saccharic acid and gluconic acidbased admixtures contain (OH) and (COOH) groups. Gluconic acid-based admixtures are used extensively. Carbohydrates include glucose sucrose or hydroxylated polymers obtained by partial hydrolysis of saccharides Action on
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Adsorption behavior and effectiveness of AMPS®-based
Poly(N N-dimethyl acrylamide-co-Ca 2-acrylamido-2-methylpropane sulfonate) (CaAMPS®-co-NNDMA) is a synthetic copolymer commonly used as cement fluid loss additive (FLA). Since the temperature correlated loss of FLA performance is not well understood it was the first objective of this study to test the impact of 100°C on adsorption and hence effectiveness of CaAMPS®-co-NNDMA.
Get PriceThe Effect of Glucose on the Properties of Cement Paste
Apr 07 2018 · Cement hydration inhibition with sucrose tartaric acid and lignosulfonate Analytical and spectroscopic study. Industrial Engineering Chemistry Research 45 (21) 7042–7049.
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USB2Suppression of antagonistic hydration
Method for suppressing antagonistic hydration reactions in Portland fly ash cement involves the use of unponded fly ash that is pre-hydrated preferably as an aqueous slurry wherein fly ash preferably having an alkaline earth metal oxide of at least 10 by weight is soaked whereby the hydration reaction of the resultant mixed fly ash and cement is accelerated when these components are mixed
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Glass ionomer cementSlideShare
Jun 10 2017 · Liquid Polyacrylaic acid45 Itaconic acid5 Maleic acid5 Tricarballylic acid5 Tartaric acidTraces (increases working time and decreases setting time) Water50 (Hydrates reaction product) 7.
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THE EFFECT OF GLUCOSE ON THE HYDRATION KINETICS
hydration while tartaric acid is retarding the C 3 A reaction. They indicate that sucrose acts via nucleation poising/surface adsorption while lignosulfonates involve the formation of a semipermeable layer on the cement particles and tartrate by tartaric acid inhibition. In case C 3 A is not retarded but is able to react with the
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Fig. 6-3. Scaled concrete surface resulting from lack of air entrainment use of deicers and poor finishing and curing practices. (52742) cracks in concrete. Using a water reducer to reduce the cement and water content of a concrete mixture—while maintaining a constant water-cement ratio—can result in
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Admixtures for ConcreteMemphis
Corrosion inhibitors 8. Shrinkage reducers 9. Alkali-silica reactivity inhibitors 10. Coloring admixtures Hydration control Suspend and reactivate cement Carboxylic acids admixtures hydration with stabilizer and activator Phosphorus-containing organic acid salts Tartaric acid and salts
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