Volcanic ash deposited on paved surfaces during volcanic eruptions often compromises skid resistance, which is a major component of safety. We adopt the British pendulum test method in laboratory conditions to investigate the skid resistance of road asphalt and airfield concrete surfaces covered by volcanic ash sourced from various locations in New Zealand. Controlled variations in ash characte...

The paper proposes an analytical model for calcium leaching of concrete due to water. The model is set in the framework of chemically active saturated porous media. Continuum damage mechanics is used in order to develop a phenomenological poroplastic model of concrete. Two forms of damaging processes are included: mechanical, modelled with two scalar damage internal variables; chemical, related...

Metakaolin concrete is a kind of porous material, which contains variety chemical ions in the pores. Solutions these pores are exposed to atmosphere and exist evaporation condensation processes, therefore, pore solution volume changes all time. When ion concentration changes, it has an important impact on strength development durability concrete. However, real-time monitoring was difficult. To ...

The El Niño phenomenon is caused by the change in atmospheric pressures, which produce accumulation of hot surface waters on eastern flank Pacific Ocean; causing intense rainfall that runs over affecting urban drainage city due to lack a permeable pavement; porous concrete allows infiltration water runoff through its pores. present investigation evaluates range w/c relationships 0.30 and 0.32; ...

The paper considers the issue of erection structures buildings and from monolithic dispersed-reinforced concrete, capable performing not only a load-bearing, but also protective function. analysis number concretes with both structural thermal insulation properties has been carried out. An increase in efficiency is expected through use industrial porous aggregates. technical indicators samples b...

Concrete is porous; the partial pores in internal structure of concrete are generated by hydration products, such as calcium hydroxide, dissolved water. External harmful substances form gases or aqueous solutions can penetrate concrete. The destruction leads to problems shortening service life well corrosion and poor durability steel. To improve pore concrete, a material be added mixtures cause...