This study presents a study on the ductility performance of hybrid fibre reinforced concrete. The influence of fibre content on the ductility performance of hybrid fibre reinforced concrete specimens having different fibre volume fractions was investigated. The parameters of investigation included modulus of rupture, ultimate load, service load, ultimate and service load deflection, crack width...

this research was conducted to study the effects of styrene and methyl methacrylate cell lumen monomers on the mechanical properties and decay resistance of beech wood. mechanical and decay resistance test samples were prepared according to astm d143-94 and din en113 standards and impregnated with five concentration monomer solution 0, 40, 60, 80 and 100 percent using bethell method. treated sa...

The procedure for experimental-analytical prediction of flexural strength is reviewed. It allows consideration of size effect phenomena with only minor modification of standard laboratory test procedure. Two possibilities are suggested: testing with one size only and testing with two sizes. The application of this procedure to real case, a massive concrete subway tunnel constructed recently in ...

bending and compression strength of paulownia fortunie wood grown in educational and research forest located at shastkalate, gorgan were studied. paulownia trees were selected among five years old plantation. sampling spot was conducted following standard procedure. trees were cut into logs, which were then cut into 6 cm thickness wood blocks based on geographic directions. wood blocks were div...

We investigate the tensile properties of MoS2 nanotubes by implementation a set molecular dynamics runs, using recently developed version Stillinger–Weber (SW) potential. The considered are H and T polytypes, with zigzag armchair chirality. found that only diameter greater or equal than 30 Å stable when modelled SW Zigzag have larger elastic modulus same polytype diameter, deform more easily na...

partial replacement of formaldehyde with furfural in the urea-formaldehyde resin on the formaldehydeemission, physical and mechanical properties of particleboard was investigated. the modulus ofrupture (mor), modulus of elasticity (moe), internal bond (ib), water absorption (wa), thicknessswelling (ts) and formaldehyde emission (fe) of poplar particleboards made with the modifiedresins were mea...

Moisture content (MC), thickness swelling (TS), and bending properties of five commercial oriente 1 strandboards (OSBs) made of two wood species were measured. The measurements were made after specimens were conditioned to equilibrium at 35, 55, 75, 85, 95% relative humidity (RH) and 24°C'. It was shown that bending modulus of elasticity (MOE) and modulus of rupture (MOR) decreasej with increas...

Heat treatment often brings about some negative effects on mechanical properties of wood. Chinese fir is currently underutilized due to some inherent properties that limit its further applications. Using steam as a heating medium and a shielding gas, the heartwood and sapwood of Chinese fir were treated at a temperature ranging from 170oC to 230oC and time from 1 to 5 hours in an airtight chamb...

A molecular model involving only hydrogen bond interactions is successful in explaining the effects of temperature and moisture on the elastic modulus of paper. Concepts of glass transitions, free volume, and plasticization help explain the role of temperature and moisture in affecting paper’s properties in terms that elicit the importance of paper’s macromolecular structure. Ultimate strength ...