摘要:
PROBLEM TO BE SOLVED: To provide a grouting method which achieves high permeability and is excellently used as a liquefaction countermeasure.SOLUTION: In a grouting method to perform permeation grouting in silty and/or sandy ground, a grouting material having a particulate silica concentration of not less than 0.1% and less than 5% and a particulate calcium hydroxide concentration of not less than 0.1% and less than 5% is injected into the ground with: injection pressure not more than 0.5 MPa; an injection rate of not more than 10 litter per minutes; and a pulsation rate of not more than 5%. An improved body constructed by the grouting method has a transverse elasticity modulus of 50 to 1,000 MN/m. Thus, the grouting method can be used as a liquefaction countermeasure.
摘要:
PROBLEM TO BE SOLVED: To provide a resin composition that is suitably used as a heat dissipating member of an exothermic electronic part such as a power device and is excellent in a conductivity and a dielectric constant in particular as an insulation layer and a thermal interface material for a printed wiring board and to provide a boron nitride composite powder that is filled in the resin composition.SOLUTION: The boron nitride composite powder is a composite powder in which a boron nitride powder being an aggregate of boron nitride particles formed by binding primary particles of hexagonal boron nitride is combined with a ceramic powder having an average particle diameter of 0.1 to 10 μm. The boron nitride composite powder has a porosity of 5 to 55%, an average particle diameter of 20 to 100 μm and a ratio I(002)/I(100) of the peak intensity of a (002) plane to the peak intensity of a (100) plane of the boron nitride of 9.0 or less in a powder X-ray diffraction method. The ceramic powder combined with the boron nitride powder is one or more kinds selected from the group consisting of aluminum oxide, zinc oxide, silicon nitride and aluminum nitride.
摘要:
PROBLEM TO BE SOLVED: To provide a concrete composition that can reduce the contraction of concrete, that is also small in slump loss, and that can impart a high crack resistance, and to provide a method for producing the same.SOLUTION: Methods for producing: (1) a concrete composition that contains an aggregate formed by subjecting portland cement clinker to carbonation treatment, and an expanding material, (2) a concrete composition of (1) in which COcontent in the aggregate is 2% or more, (3) a concrete composition of (1) or (2) in which the aggregate is coarse aggregate of 5 to 40 mm and/or fine aggregate of below 5 mm, and (4) a concrete composition that is formed by blending an expanding material into an aggregate formed by comminuting portland cement clinker and subjecting the same to carbonation while immersing in water.