Thermal evolution of a slate

Soto, Pedro J. Sánchez; Ruíz-Conde, Antonio; Bono, Richard K.; Raigón, M.; Garzón, Eduardo Garzón

doi:10.1007/s10973-007-7751-2

Cited by 23 publications

(11 citation statements)

References 27 publications

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“…The critical value of MW is around 4000-PEG with molar mass lower than 4000 generally crystallizes in extended form in contrast to PEG with molar mass higher than 4000 which crystallizes mostly as folded chains. [27] XRD analysis was performed to confirm the crystalline features of PEG. The XRD patterns of PEG ( Fig.…”

Section: Modification Of Bone Cements By Peg With Different Molecularmentioning

confidence: 99%

Modification of acrylic bone cements by poly(ethylene glycol) with different molecular weight

Król

Pielichowska

2016

Polymers for Advanced Techs

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The high polymerization temperature of acrylic bone cements can cause arthroplasty failure because of the thermal necrosis of surrounding bone tissue. To reduce this undesired effect we have developed novel acrylic bone cement composites containing a phase change material (PCM). As PCM poly(ethylene glycol) (PEG) of different molecular weight was applied and the effect of its incorporation on curing parameters, mechanical and morphological properties of acrylic bone cement was investigated. A significant decrease in maximum temperature from 65.8°C to 47.4°C and slight increase of setting time were observed. PEG introduction also contributed to the thermal stability of acrylic bone cement increase. SEM investigation of modified bone cement confirmed that the microstructure does not alter considerably because of PEG content. It was found that both PEG addition and incubation test contribute to an inconsiderable decrease in mechanical strength of bone cement. However, the mechanical strength increase can be caused by the fresh bone tissue incorporation into the pores appearing in bone cement.

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Section: Modification Of Bone Cements By Peg With Different Molecularmentioning

confidence: 99%

Modification of acrylic bone cements by poly(ethylene glycol) with different molecular weight

Król

Pielichowska

2016

Polymers for Advanced Techs

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“…Smaller proportions of the following have also been identified: calcite (not detected-8%) and an interstratified phase [28], although it is difficult to estimate the exact proportion. All these results are presented in Table 6.…”

Section: Xrd and Statistical Analysismentioning

confidence: 99%

Multivariate Statistical Analysis of Phyllite Samples Based on Chemical (XRF) and Mineralogical Data by XRD

Garzón¹,

Ruíz-Conde²,

Sánchez-Soto³

2012

AJAC

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It is presented the results obtained of a multivariate statistical analysis concerning the chemical and phase composition, as a characterization purpose, carried out with 52 rock phyllite samples selected from the provinces of Almería and Granada (SE Spain). Chemical analysis was performed by X-ray fluorescence (XRF). Crystalline phase analysis was performed by X-ray powder diffraction (XRD) and the mineralogical composition was then deduced. Quantification of weight loss (100˚ and 1000˚C) was carried out by thermal analysis. The aims of this investigation were to analyze and compare the chemical and mineralogical composition of all these samples and to find similarities and differences between them to allow a classification. Several correlations between results of the characterization techniques have been also investigated. All the data have been processed using the multivariate statistical analysis method. The XRF macroelements (10) and microelements (39) data generate one macrogroup with two new subgroups (1 and 2), and an isolated sample. In subgroup 1 of macroelements, a positive correlation was found between XRF results and geographic location characterized by lower MgO content, which is associated to its geological origins. When multivariate statistical analysis is applied to results obtained by XRD, two groups appear: the first one with a sample with zero percentage of iron oxide and the second one with the rest of the samples, which is classified in two groups. A correlation is observed between the alkaline content (XRF) and illite (XRD), CaO and MgO with dolomite and indirectly between the weight loss after heating at 1000˚C and the contents of phase minerals that lose structural water (illite + chlorite) or carbon dioxide (dolomite). The present investigation has interest and implications for geochemistry and analytical chemistry concerning earth rocks and silicate raw materials.

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“…Una de estas patologías consiste en la paulatina degradación de estructuras de hormigón debido a las reacciones que se producen entre ciertos áridos silíceos y los hidróxidos alcalinos de los cementos cuando este hormigón se encuentra en ambientes de alta humedad (Stanton, 1948; Herrador et al, 2008). El resultado de esta reactividad es la aparición de geles silicocalcoalcalinos que sufren grandes aumentos de volumen, debido a su gran absorción de agua, y provocan la fisuración de los áridos y la pasta de cemento como consecuencia de las tensiones que estos geles hidratados producen (Dent Glasser & Kataoka, 1981; Fournier & Béru-bé, 2000;Menéndez & Soriano, 2007).Las presiones generadas por la expansión de los geles producto de estas reacciones dan lugar a las roturas registradas en los áridos y la pasta de cemento que los envuelve, lo que redunda en el deterioro del hormigón del que forman parte (Ichikawa & Miura, 2007).Reactividad álcali-sílice y álcali-silicato en pizarras Alkali-silica and alkali-silicate …”

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Reactividad álcali-sílice y álcali-silicato en pizarras

Campos¹,

Gadea²,

Soriano³

et al. 2010

Estud. geol.

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IntroducciónEs bien conocido que los hormigones sufren agresiones que afectan en mayor o menor medida a su durabilidad. Una de estas patologías consiste en la paulatina degradación de estructuras de hormigón debido a las reacciones que se producen entre ciertos áridos silíceos y los hidróxidos alcalinos de los cementos cuando este hormigón se encuentra en ambientes de alta humedad (Stanton, 1948; Herrador et al., 2008). El resultado de esta reactividad es la aparición de geles silicocalcoalcalinos que sufren grandes aumentos de volumen, debido a su gran absorción de agua, y provocan la fisuración de los áridos y la pasta de cemento como consecuencia de las tensiones que estos geles hidratados producen (Dent Glasser & Kataoka, 1981; Fournier & Béru-bé, 2000;Menéndez & Soriano, 2007).Las presiones generadas por la expansión de los geles producto de estas reacciones dan lugar a las roturas registradas en los áridos y la pasta de cemento que los envuelve, lo que redunda en el deterioro del hormigón del que forman parte (Ichikawa & Miura, 2007).Reactividad álcali-sílice y álcali-silicato en pizarras Alkali-silica and alkali-silicate

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Thermal evolution of a slate

Cited by 23 publications

References 27 publications

Modification of acrylic bone cements by poly(ethylene glycol) with different molecular weight

Modification of acrylic bone cements by poly(ethylene glycol) with different molecular weight

Multivariate Statistical Analysis of Phyllite Samples Based on Chemical (XRF) and Mineralogical Data by XRD

Reactividad álcali-sílice y álcali-silicato en pizarras

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