Abstract
The high strength concrete up to 98 MPa for structures has been able to produce and been generally available by using superplasticizer developed in 1970 employing such conventional techniques as combinations of high cement factors, mixing and curing with care. Then, in 1980 the basic technology for producing the ultra-strength concrete of 196 MPa was developed and it has been given attention in the world. The ultra-high strength called Densit-Concrete is produced by filling minutely vacant spaces in cement paste with microsilica. The author explained the quality control of concrete corresponding with the application of high strength concrete from both aspects of production and execution in-situ.
