6533b870fe1ef96bd12cf011

RESEARCH PRODUCT

Quasi-brittle porous material: Simulated effect of stochastic air void structure on compressive strength

Tero TuovinenLeena TurunenAnna-leena ErkkiläTeemu LeppänenJoni ParkkonenJussi Virkajärvi

subject

Pore sizeVoid (astronomy)Materials scienceScattering0211 other engineering and technologies02 engineering and technologyBuilding and Construction021001 nanoscience & nanotechnologyPhysics::GeophysicsCompressive strengthBrittlenessLinear relationship021105 building & constructionGeneral Materials ScienceComposite materialMortar0210 nano-technologyPorosity

description

Abstract The effect of porosity comprised of spherical air voids on the compressive strength of quasi-brittle material was studied via simulations. The simulated porous structures were based on pore size distributions of two mortar samples measured by X-ray microtomography. While the simulation method set practical limits on the size of sample, the base of the statistics was established by simulating 128 small structures generated by sampling from pore structures of two mortars. By studying the application of the classical strength-porosity formulas to the simulated data, a new simple model was formed. A linear relationship was achieved between the cubic root of air void fraction (porosity) and the simulated compressive strength. The reasons for scattering of simulated strength around fitted trend remained unresolved in this study; no clear dependence on pore number or other distribution properties was observed. With the presented simulation approach, the dependence of compressive strength on porosity is achieved independently of disturbances that occur in experimental studies creating understanding of compressional behavior of low porosity materials.

yearjournalcountryeditionlanguage
2021-01-01Cement and Concrete Research
https://doi.org/10.1016/j.cemconres.2020.106255