Closure to “Stanton on Expansion Of Concrete”

Stanton, T E

doi:10.1061/taceat.0005539

Cited by 4 publications

(5 citation statements)

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“…3 Such studies have identified a strong reaction between alkali materials in the cement and reactive silica commonly referred to as the alkali-silica reaction (ASR). 4 This reaction (equation (1)) produces an alkali-silica-hydrate (A-S-H) gel which contains K z , Na z and OH 2 taken up from the pore solution. 5,6 SiO 2 z2Ca(OH)…”

Section: Introductionmentioning

confidence: 99%

Pozzolanic properties of glass fines in lime mortars

Edwards

Allen

Ball

et al. 2007

Advances in Applied Ceramics

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This paper describes a study to evaluate the effect of finely ground waste glass on the mechanical, chemical and structural properties of a NHL 3?5 hydraulic lime mortar. Finely ground waste glass was mixed with a natural hydraulic lime of classification 3?5 in the lime/glass ratio, 10 : 1, 1 : 1, 1 : 2 and 1 : 3. Cylindrical samples were formed and placed in a controlled environment for up to 11 weeks. The mechanical properties were investigated by destructively testing the samples in compression before chemical analysis using Raman spectroscopy, energy dispersive X-ray spectroscopy and powder X-ray diffraction. The structure of the samples was investigated using focused ion beam microscopy. Evidence for a pozzolanic reaction at the glass/lime interface was observed together with the chemical process involved.

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Section: Introductionmentioning

confidence: 99%

Pozzolanic properties of glass fines in lime mortars

Edwards

Allen

Ball

et al. 2007

Advances in Applied Ceramics

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“…One of the critical parameters involved in this effect is the reactive silica content. It has been established, by measuring the expansion of concrete bars immersed in alkali hydroxide solutions, that the expansion coefficient exhibits a maximum when measured as a function of the reactive silica content in the aggregates . The reactive silica content corresponding to maximum expansion is called the “pessimum” content.…”

Section: Introduction and Basic Aspects Of Alkali−silica Reactionmentioning

confidence: 99%

“…It has been established, by measuring the expansion of concrete bars immersed in alkali hydroxide solutions, that the expansion coefficient exhibits a maximum when measured as a function of the reactive silica content in the aggregates. 1 The reactive silica content corresponding to maximum expansion is called the "pessimum" content. On the other hand, expansion of concrete bars also depends on the nature of the alkaline cation.…”

Section: Introduction and Basic Aspects Of Alkali-silica Reactionmentioning

confidence: 99%

²⁹Si NMR and Small-Angle X-ray Scattering Studies of the Effect of Alkaline Ions (Li⁺, Na⁺, and K⁺) in Silico-Alkaline Sols

et al. 1999

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Alkali−silica reactions (ASR) which occur in concrete can be simulated in laboratory by destabilization of silico-alkaline aqueous solutions by addition of calcium ions. The relevant features of the reaction depend on the nature of alkaline ions (Li+, Na+, or K+) and on the silica/alkaline ratios which fix the distribution of the molecular species in the precursor solution. 29Si NMR spectroscopy and small-angle X-ray scattering (SAXS) techniques were used to study the structure and size distribution of molecular and colloidal species in sols with different silica/alkaline molar ratio and several types of alkaline ions. Experimental SAXS curves were simulated using a simple structural model which assumes the sol to be composed of a multimodal set of weakly interacting hard spheres immersed in a liquid matrix. The results indicate the existence of strong interactions between alkaline ion and hydroxide and between alkaline ion and silicate species. The formation of large species (cyclic molecules and colloidal particles) is enhanced in solutions containing lithium. These results are consistent with those of previous investigations.

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“…A 2019 review of 19 studies of prosthetic joint infection estimated the annual mortality risk after prosthetic joint infection managed with 2-stage revision to be 4.2%, or a 5-year risk of 21.1%, compared with an age-matched population mortality of 1.58%. This survival rate is reportedly worse than rates for the 4 most common cancers: testicular, Hodgkin lymphoma, melanoma, and breast cancer . Of our 59 patients who had surgery to manage postosseointegration infection, 2 died (3.4%) at 3 years and more than 5 years after osseointegration.…”

Section: Discussionmentioning

confidence: 77%

Association Between Osseointegration of Lower Extremity Amputation and Mortality Among Adults

et al. 2022

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ImportanceTranscutaneous osseointegration post amputation (TOPA) creates a direct linkage between residual bone and an external prosthetic limb, providing superior mobility and quality of life compared with a socket prosthesis. The causes and potential risks of mortality after TOPA have not been investigated.ObjectiveTo investigate the association between TOPA and mortality and assess the potential risk factors.Design, Setting, and ParticipantsThis observational cohort study included all patients with amputation of a lower extremity who underwent TOPA between November 1, 2010, and October 31, 2021, at a specialty orthopedic practice and tertiary referral hospital in a major urban center. Patients lived on several continents and were followed up as long as 10 years.ExposuresTranscutaneous osseointegration post amputation, consisting of a permanent intramedullary implant passed transcutaneously through a stoma and connected to an external prosthetic limb.Main Outcomes and MeasuresDeath due to any cause. The hypotheses tested—that patient variables (sex, age, level of amputation, postosseointegration infection, and amputation etiology) may be associated with subsequent mortality—were formulated after initial data collection identifying which patients had died.ResultsA total of 485 patients were included in the analysis (345 men [71.1%] and 140 women [28.9%]), with a mean (SD) age at osseointegration of 49.1 (14.6) years among living patients or 61.2 (12.4) years among patients who had died. Nineteen patients (3.9%) died a mean (SD) of 2.2 (1.7) years (range, 58 days to 5 years) after osseointegration, including 17 (3.5%) who died of causes unrelated to osseointegration (most commonly cardiac issues) and 2 (0.4%) who died of direct osseointegration-related complications (infectious complications), of which 1 (0.2%) was coclassified as a preexisting health problem exacerbated by osseointegration (myocardial infarction after subsequent surgery to manage infection). No deaths occurred intraoperatively or during inpatient recuperation or acute recovery after index osseointegration (eg, cardiopulmonary events). Kaplan-Meier survival analysis with log-rank comparison and Cox proportional hazards regression modeling identified increased age (hazard ratio, 1.06 [95% CI, 1.02-1.09]) and vascular (odds ratio [OR], 4.73 [95% CI, 1.35-16.56]) or infectious (OR, 3.87 [95% CI, 1.31-11.40]) amputation etiology as risk factors. Notable factors not associated with mortality risk included postosseointegration infection and male sex.Conclusions and RelevanceThese findings suggest that patients who have undergone TOPA rarely die of problems associated with the procedure but instead usually die of unrelated causes.

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Closure to “Stanton on Expansion Of Concrete”

Cited by 4 publications

References 0 publications

Pozzolanic properties of glass fines in lime mortars

Pozzolanic properties of glass fines in lime mortars

²⁹Si NMR and Small-Angle X-ray Scattering Studies of the Effect of Alkaline Ions (Li⁺, Na⁺, and K⁺) in Silico-Alkaline Sols

Association Between Osseointegration of Lower Extremity Amputation and Mortality Among Adults

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Closure to “Stanton on Expansion Of Concrete”

Cited by 4 publications

References 0 publications

Pozzolanic properties of glass fines in lime mortars

Pozzolanic properties of glass fines in lime mortars

29Si NMR and Small-Angle X-ray Scattering Studies of the Effect of Alkaline Ions (Li+, Na+, and K+) in Silico-Alkaline Sols

Association Between Osseointegration of Lower Extremity Amputation and Mortality Among Adults

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²⁹Si NMR and Small-Angle X-ray Scattering Studies of the Effect of Alkaline Ions (Li⁺, Na⁺, and K⁺) in Silico-Alkaline Sols