A comparison study of porosity and compressive strength mathematical models with image analysis

Öztürk, Ali Uğur; Baradan, Bülent

doi:10.1016/j.commatsci.2008.02.011

Cited by 87 publications

(13 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…According to the characteristics of cement-based materials, its macro performance [27] is determined by its microstructure characteristics, and the microscopic pore structure is one of its important properties [28,29]. As the hydration reaction progresses, it evolves and affects the macroscopic properties such as strength [30][31][32][33] and permeability [34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Macroscopic Behavior and Microstructure Property Evolution of Hardened Cement Consolidated Tailings

Sun

Hou

2019

Minerals

View full text Add to dashboard Cite

Surface cement consolidated tailings disposal has recently been proposed to manage tailings in the modern mining industry because it can reduce or eliminate the disadvantages of traditional tailings storage. In this study, the evolution of the macro performance and microstructure characteristics of cement consolidated tailing samples during the curing period were determined by unconfined compressive strength tests, permeability tests, scanning electron microscopy (SEM) observations, and mercury intrusion porosimetry (MIP) tests, respectively. The results show that the curing time notably affected the macro performance and microstructural properties of the hardened cement consolidated tailings samples. As the curing age increases, the compressive strength increases nonlinearly and the growth rate decreases; the permeability decreases rapidly first, then gradually stabilizes, and finally reaches a stable value; the morphology of the hydration products and microstructures continues to evolve with the hydration process; the total pore volume decreases slightly, whereas the critical pore size decreases significantly. The proportion of the pore volume in different pore size ranges can also be affected by the curing age, which results in a large pore (>200 nm) decrease, and the small pores (<200 nm) increased. In this process, the filling effect plays a major role.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Macroscopic Behavior and Microstructure Property Evolution of Hardened Cement Consolidated Tailings

Sun

Hou

2019

Minerals

View full text Add to dashboard Cite

show abstract

“…If changes of the surface and subsurface structure are monitored at a microscopic scale, the decay of decorated rock surfaces may be detected at an early stage 11,12,13 ; informing conservation decisions to protect rock art panels.…”

Section: Discussionmentioning

confidence: 99%

OCT and NMR for non-invasive in-situ monitoring of the vulnerability of rock art monuments

2011

View full text Add to dashboard Cite

This paper will introduce a new application of Optical Coherence Tomography (OCT) to the monitoring of vulnerability of rock art monuments in-situ. The porosity of the host rock is an important factor affecting the susceptibility of rock art monuments to decay. Pore characteristics of rocks are one of the main factors that control the intensity of physical deterioration. OCT has successfully been applied to paintings and archaeological objects, including geological materials, to produce cross sectional images non-invasively. The stack of cross sectional images can be rendered as a volume to visualise the structure in depth over an extended area. Preliminary studies show that it can directly image the pores and subsurface structure to within 500microns of the surface depending on lithology. This study aims to analyse this stack of cross sectional images computationally to enable the description of the pore space distribution which will be compared with spatially resolved NMR porosity measurement for the samples.

show abstract

“…This was also observed in our studies where the increase in porosity Porosity has also been shown to affect the mechanical properties of PMMA cement, such as the compressive strength. Higher porosity has been associated with a lower compressive strength [38][39] . This general trend has also been observed when the number of pores or pore volume fraction was plotted against the compressive strength of the samples.…”

Section: Discussionmentioning

confidence: 99%

Combination antibiotic PMMA composites provide sustained broad-spectrum antimicrobial activity and allow for post-implantation refilling

Chen

et al. 2019

Preprint

View full text Add to dashboard Cite

Antibiotics are commonly added to poly(methyl methacrylate) (PMMA) by surgeons to locally treat infections such as in bone cement for joint replacement surgeries, but also as implantable antimicrobial "beads". However, this strategy is of limited value in high risk patients where infections can be recurrent or chronic and otherwise hard to treat. Also when only one drug is incorporated and applied toward poly-microbial infections (multiple bacterial species), there is a high risk that bacteria can develop antibiotic resistance. To combat these limitations, we developed a combination-antibiotic PMMA composite system comprised of rifampicin-filled β cyclodextrin (β-CD) microparticles added into PMMA filled with a second drug. Different formulations were evaluated through Zone-of-Inhibition, drug activity, antibiotic release and refilling, as well as mechanical studies. Our combination-antibiotic PMMA composite system achieved up to an eight-fold increase in duration of antimicrobial activity in comparison to clinically used antibiotic-filled PMMA. Inclusion of CD microparticles also allowed for refilling of additional antibiotics after simulated implantation, resulting in additional windows of therapeutic efficacy. Mechanical testing showed that our tested formulations did have a small, but significant decrease in mechanical properties when compared to unmodified controls. While further studies are needed to determine whether the tested formulations are still suitable for loadbearing applications (e.g. bone cement), our composites are certainly amenable for a variety of non-load bearing applications (e.g. antimicrobial "beads" and temporary spacer in two-stage arthroscopic revisions).

show abstract

A comparison study of porosity and compressive strength mathematical models with image analysis

Cited by 87 publications

References 22 publications

Experimental Investigation of the Macroscopic Behavior and Microstructure Property Evolution of Hardened Cement Consolidated Tailings

Experimental Investigation of the Macroscopic Behavior and Microstructure Property Evolution of Hardened Cement Consolidated Tailings

OCT and NMR for non-invasive in-situ monitoring of the vulnerability of rock art monuments

Combination antibiotic PMMA composites provide sustained broad-spectrum antimicrobial activity and allow for post-implantation refilling

Contact Info

Product

Resources

About