Fractal dimension of concrete incorporating silica fume and its correlations to pore structure, strength and permeability

Graphene reinforced cement composites: A review

Comparison of Mercury Intrusion Porosimetry and multi-scale X-ray CT on characterizing the microstructure of heat-treated cement mortar

Waste ceramic powder as a pozzolanic supplementary filler of cement for developing sustainable building materials

The effect of steam curing regimes on the chloride resistance and pore size of high–strength green concrete

Graphene nanoplatelets as an effective additive to tune the microstructures and piezoresistive properties of cement-based composites

Tracing mercury entrapment in porous cement paste after mercury intrusion test by X-ray computed tomography and implications for pore structure characterization

Mercury intrusion porosimetry (MIP) is questioned for possibly damaging the micro structure of cement-based materials (CBMs), but this theme still has a lack of quantitative evidence By using X-ray computed tomography (XCT), this study reported an experimental investigation on probing the pore structure damages in paste and mortar samples after a standard MIP test XCT scans were performed on the samples before and after mercury intrusion Because of its very high mass attenuation coefficient, mercury can greatly enhance the contrast of XCT images, paving a path to probe the same pores with and without mercury fillings The paste and mortar showed the different MIP pore size distributions but similar intrusion processes A grey value inverse for the pores and material skeletons before and after MIP was found With the features of excellent data reliability and robustness verified by a threshold analysis, the XCT results characterized the surface structure of voids, and diagnosed the pore structure damages in terms of pore volume and size of the paste and mortar samples The findings of this study deepen the understandings in pore structure damages in CBMs by mercury intrusion, and provide methodological insights in the microstructure characterization of CBMs by XCT

https://www.mdpi.com/1996-1944/12/14/2220/pdf

Pore Structure Damages in Cement-Based Materials by Mercury Intrusion: A Non-Destructive Assessment by X-Ray Computed Tomography

Transmission micro-focus X-ray radiographic measurements towards in-situ tracing capillary imbibition fronts and paths in ultra-thin concrete slices

There is a great clinical need for biodegradable materials. This study aimed to investigate the effects of Mg–6Zn and titanium alloy stapler nails on intestinal anastomosis healing mediated via the TGF-β/Smad signaling pathway, as reflected in collagen metabolism in rabbits. Side-to-side ileo-ileostomy was performed with linear stapler loaded with the two nails. The results showed that no obvious postoperative complications such as abdominal infection and anastomotic leakage were observed. General observation and scanning electron microscope showed that Mg–6Zn alloy nails remained intact in the first week, degraded significantly in the second week, and were little left in the third week, while the titanium alloy nails showed intact substrate throughout the experimental period. Immunohistochemical analysis showed that the expression of TGF-β1 in Mg–6Zn alloy group was higher than that in titanium alloy group after 1 week, but it increased slowly, arrived at a lower level in the third week. Collagen I showed an increased expression in Mg–6Zn alloy group, but decreased with time in titanium alloy group. An enhanced expression of collagen III in Mg–6Zn alloy group in the first week but much lower in the third week as compared to the titanium alloy group. The expression of smad2 in Mg–6Zn alloy group maintained a steady level, while in titanium alloy group it showed a general upward trend. The expression of smad3 in both groups held steady after 2 weeks, then in the third week, it showed a strong uptrend in Mg–6Zn alloy group, while decreased immediately in titanium alloy group. Our findings suggest that Mg–6Zn alloy nails degraded significantly within 3 weeks and could provide stability of intestinal anastomosis in the reconstruction of intestinal tract. TGF-β/Smad signaling pathway may play a role in regulation of baseline collagen synthesis throughout the process.

Mg–6Zn alloys promote the healing of intestinal anastomosis via TGF-β/Smad signaling pathway in regulation of collagen metabolism as compared with titanium alloys

Xiaohu Wang

Papers

Graphene nanoplatelets as an effective additive to tune the microstructures and piezoresistive properties of cement-based composites

Tracing mercury entrapment in porous cement paste after mercury intrusion test by X-ray computed tomography and implications for pore structure characterization

Pore Structure Damages in Cement-Based Materials by Mercury Intrusion: A Non-Destructive Assessment by X-Ray Computed Tomography

Transmission micro-focus X-ray radiographic measurements towards in-situ tracing capillary imbibition fronts and paths in ultra-thin concrete slices

Mg–6Zn alloys promote the healing of intestinal anastomosis via TGF-β/Smad signaling pathway in regulation of collagen metabolism as compared with titanium alloys