The Effect of Alkali Silica Gel Formation from Alkali Silica Reaction in Mesoscopic Scale

2015 ◽  
Vol 752-753 ◽  
pp. 295-299
Author(s):  
M. Tabet ◽  
Abdelhamid Guettala
Keyword(s):  
Numerical Model ◽  
Silica Gel ◽  
Rheological Behavior ◽  
Alkali Silica Reaction ◽  
Gel Formation ◽  
Mesoscopic Scale ◽  
Rheological Models ◽  
Strain Stress

In this article we treat a pathological problem for a better understanding of the phenomena of ASR; the modeling of ASR has been represented in a relative element of volume (REV) in mesoscopic scale. The method used to estimate the formation of ASG is the kinematic estimation of the ASR where it generates in the end an expansion, thus modeling leads to a better range of understanding of the rheological behavior of a concrete with ASR.The numerical model adopted to validate the effect of the expansion of alkali silica gel in terms of strain/stress is a phenomenological one, where it gives sustainable results with the rheological models.

scholarly journals Effect of Lithium Based Admixtures on Alkali Silica Reaction in Concrete and Flexural Behavior of Reinforced Concrete Rectangular Beams

2018 ◽  
Vol 7 (1) ◽  
pp. 52-59
Author(s):  
S. Sathya .
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Lithium Ion Batteries ◽  
Electronic Waste ◽  
Great Influence ◽  
Lithium Ion ◽  
Flexural Behavior ◽  
Alkali Silica Reaction ◽  
Lithium Nitrate ◽  
Gel Formation

In recycling of lithium-ion batteries, lithium is a challenging element, which possesses great threat to the environment. The disposal of electronic waste is a major problem, which our country is currently facing, whereas, the lithium is one of the compound in electronic waste which challenges the recycling of lithium-ion batteries. If lithium is properly extracted, it can be used for structural engineering purpose. Lithium, if used in concrete, it controls the cracks due to alkali silica reaction (ASR), resulting in increased strength and durability of the concrete. Lithium based admixtures are effective in suppression of alkali silica reaction and delayed ettringite formation, if the dosage added in concrete is appropriate. The main objective of this paper is to assess the effectiveness of LiNO3 at various dosage levels in concrete. In this paper, the effect of LiNO3 on the mechanical properties of concrete, ASR gel formation and the flexural behavior of reinforced concrete rectangular beams are studied. The mechanical properties of concrete was investigated for six mix proportions comprising of control mix, lithium nitrate at 0.6M, 0.65M, 0.7M, 0.75M, 0.8M. LiNO3 not only prevents the ASR gel formation, but also it has great influence on mechanical properties of concrete. The results indicate that the concrete with 0.75M LiNO3 has higher strength values. SEM analysis has been performed for 0.75M and control mix to study the micro characteristics of concrete. The ASR gel formed in 0.75M has been suppressed as compared to that of concrete without lithium nitrate as an admixture. The durability studies are performed in concrete for water permeability, water absorption and rapid chloride penetration characteristics. The analytical study of flexural behavior of reinforced concrete rectangular beam is done using the software ANSYS 16.0.

Alkali-Silica Reaction Mitigation: State-of-the-Art

2001 ◽  
Author(s):  
Luis J. Malvar ◽  
Greg D. Cline ◽  
Doug F. Burke ◽  
R. Rollings ◽  
Joey Greene ◽  
...  
Keyword(s):  
State Of The Art ◽  
Alkali Silica Reaction

Uncertainty Quantification in Vibro-Acoustics Diagnosis of Alkali-Silica Reaction Degradation in Medium-Sized Concrete Samples

2018 ◽  
Author(s):  
Sankaran Mahadevan ◽  
Sarah Miele ◽  
Parnav Karve ◽  
Julia Finfrock ◽  
Garrett Thorne ◽  
...  
Keyword(s):  
Uncertainty Quantification ◽  
Alkali Silica Reaction

Preparation of graft copolymers by the reaction of polymeric acyl chlorides with monohydroxy-terminated polymers: An introductory study

1988 ◽  
Vol 53 (8) ◽  
pp. 1735-1744 ◽  
Author(s):  
Jitka Horská ◽  
Jaroslav Stejskal ◽  
Pavel Kratochvíl ◽  
Aubrey D. Jenkins ◽  
Eugenia Tsartolia ◽  
...  
Keyword(s):  
Light Scattering ◽  
Chemical Composition ◽  
Statistical Model ◽  
Graft Copolymers ◽  
Coupling Reaction ◽  
Molecular Characteristics ◽  
Gel Formation ◽  
Acyl Chlorides ◽  
Molecular Weights

An attempt was made to prepare well-defined graft copolymers by the coupling reaction between acyl chloride groups located along the backbone chain and monohydroxy-terminated grafts prepared separately. The molecular weights and the parameters of heterogeneity in chemical composition of the products were determined by light scattering and osmometry. The determination of molecular characteristics revealed that the degree of grafting was low. The results therefore could not be confronted with a statistical model at this stage. The problems encountered in the synthesis, e.g., gel formation, and the data relating to the soluble products are discussed.

Assessment of gel formation in colloidal dispersions during mixing in turbulent jets

AIChE Journal ◽  
2013 ◽  
Vol 59 (12) ◽  
pp. 4567-4581 ◽  
Author(s):  
Miroslav Soos ◽  
Daniele L. Marchisio ◽  
Jan Sefcik
Keyword(s):  
Turbulent Jets ◽  
Colloidal Dispersions ◽  
Gel Formation

scholarly journals Antioxidant Network Based on Sulfonated Polyhydroxyalkanoate and Tannic Acid Derivative

2021 ◽  
Vol 8 (1) ◽  
pp. 9
Author(s):  
Laura Brelle ◽  
Estelle Renard ◽  
Valerie Langlois
Keyword(s):  
Gallic Acid ◽  
Tannic Acid ◽  
Water Soluble ◽  
Gel Formation ◽  
Ene Reaction ◽  
Inorganic Cations ◽  
Medium Chain Length ◽  
Physically Crosslinked ◽  
The Stability ◽  
Derivatives Of

A novel generation of gels based on medium chain length poly(3-hydroxyalkanoate)s, mcl-PHAs, were developed by using ionic interactions. First, water soluble mcl-PHAs containing sulfonate groups were obtained by thiol-ene reaction in the presence of sodium-3-mercapto-1-ethanesulfonate. Anionic PHAs were physically crosslinked by divalent inorganic cations Ca2+, Ba2+, Mg2+ or by ammonium derivatives of gallic acid GA-N(CH3)3+ or tannic acid TA-N(CH3)3+. The ammonium derivatives were designed through the chemical modification of gallic acid GA or tannic acid TA with glycidyl trimethyl ammonium chloride (GTMA). The results clearly demonstrated that the formation of the networks depends on the nature of the cations. A low viscoelastic network having an elastic around 40 Pa is formed in the presence of Ca2+. Although the gel formation is not possible in the presence of GA-N(CH3)3+, the mechanical properties increased in the presence of TA-N(CH3)3+ with an elastic modulus G’ around 4200 Pa. The PHOSO3−/TA-N(CH3)3+ gels having antioxidant activity, due to the presence of tannic acid, remained stable for at least 5 months. Thus, the stability of these novel networks based on PHA encourage their use in the development of active biomaterials.

scholarly journals Gel Formation in Reversibly Cross-Linking Polymers

2021 ◽  
Author(s):  
Maud Formanek ◽  
Lorenzo Rovigatti ◽  
Emanuela Zaccarelli ◽  
Francesco Sciortino ◽  
Angel J. Moreno
Keyword(s):  
Cross Linking ◽  
Gel Formation

scholarly journals Alkali–silica reaction (ASR)—performance testing: Influence of specimen pre-treatment, exposure conditions and prism size on alkali leaching and prism expansion

2013 ◽  
Vol 53 ◽  
pp. 68-90 ◽  
Author(s):  
Jan Lindgård ◽  
Michael D.A. Thomas ◽  
Erik J. Sellevold ◽  
Bård Pedersen ◽  
Özge Andiç-Çakır ◽  
...  
Keyword(s):  
Performance Testing ◽  
Alkali Silica Reaction ◽  
Alkali Leaching ◽  
Pre Treatment ◽  
Exposure Conditions
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