Topics of research

• ・Effective Usage of By-Product to Aggregate for Concrete
• ・Improvement of Durabirity of Concrete Building
• ・Effective Methods for Mix Proprtioning of Concrete
• ・History of Building Materials based on Statistics
  

Research content

In order to use by-products,i.e. blust furnace slag, fly-ash, melt-solidified slag, as aggregate for concrete or building materials,several experiments have been carried out for these ten years. As for blust furnace slag, some series of experiment have been conducted to extend its usage to high strength concrete as fine aggregate. Mix proportioning, bleeding, strength development in structures, static modulus of elasticity, frost resistance, drying shrinkage, alkali-aggregate reactivity, etc., were considered.
As for melt-solidified slag, test methods for detecting the pop-out due to CaO were considered. Many factors influencing the pop-out, i.e. temperature of test, content of CaO, size of particles, cycles of test, shape and size of specimen, were considered, and two methods were developped to check the pop-out due to CaO contained in melt-solidified slag.
In order to secure the durabirity of concrete base for house during 100 years, model bases were made with actual ready mixed concrete on 13 sites near Hachiouji district, and core specipmens from the models were tested for carbonation and strength development The life of concrete base will be caliculated with the carbonation test results and measurement results of acuracy of reinforcement.