Katsunori DEMURA's research while affiliated with Nihon University and other places
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Publications (23)
This paper deals with the effect of surface treatment by water-absorption-controlling materials on the carbonation resistance of polymer-modified mortar coated concretes. Two types of the polymer-modified mortars are prepared with the polymer-cement ratios of 0 and 5％ as coating mortars for base concretes. The base concretes with water-cement ratio...
This paper deals with the compressive and flexural strength properties of the porous concrete using polymer-modified mortars as binder. The applicability of the strength estimating equation for the porous concrete based on the ratio of the strength of the porous concrete to binder strength proposed by the research committee concerning the porous co...
This paper deals with the effect of the application quantity of water-absorption-controlling material on adhesive strength properties and carbonation resistance of polymer-modified mortar coated concretes. Two types of the polymer-modified mortar are prepared with the polymer-cement ratios of 0 and 5％ as coating mortars. The base concrete surface i...
The purpose of this study is to investigate the coefficient of admixture for granulated blast-furnace slag and fly ash in an estimation formula for static modulus of elasticity of porous concretes. The porous concretes using the crushed hard sandstone and limestone as coarse aggregates with the different static modulus of elasticity and the cement...
The purpose of this study is to investigate the estimation formula for the static modulus of elasticity of porous concrete in consideration of type of coarse aggregate and admixture used. The porous concretes using the crushed hard sandstone and limestone as coarse aggregates with the different static modulus of elasticity and silica fume premix-ce...
The non-volatile matter of 35％ or higher as a total solid content of emulsions for cement modifier is required by JIS A 6203 （Polymer dispersions and redispersible polymer powders for cement modifiers）. On the other hand, the emulsions with low-solid content of less than 35％ have been used in the construction fields because such emulsions do not re...
The purpose of this study is to investigate the applicability of New RC equation of Architectural Institute of Japan （AIJ） for estimating the static modulus of elasticity of the ordinary cement concrete to the porous concrete. The porous concretes using cement mortar as a binder and two types of coarse aggregates with different static modulus of el...
The purpose of this study is to investigate the effect of polymer content on resistance to water permeation and durability of polymer-modified mortars. Polymer-modified mortars using re-dispersible polymer powder and with fine aggregate cement ratio of 2 and 3, water-cement ratios of 45, 50, 55 and 60％, polymer contents of 0, 2, 4 and 6％ are prepar...
The Hashin-Hansen’s equation introduced from the low of mixture is established for estimating the static modulus of elasticity of the cement concrete as a two-phase composite material. In previous study, the authors proposed an estimating formula of the static modulus of elasticity of porous concretes based on the Hashin-Hansen’s equation with a co...
The purpose of this study is to investigate the effect of polymer content on flexural and compressive strengths of polymer-modified mortars. Polymer-modified mortars using re-dispersible polymer powder and with fine aggregate cement ratio of 2 and 3, water-cement ratios of 45, 50, 55 and 60％, polymer contents of 0, 2, 4 and 6％ are prepared, and cur...
This paper deals with the rust-inhibiting properties of patching materials containing chloride ion fixing admixture and nitrous acid type admixtures by the outdoor exposure of specimens modeling RC structure. As a result, the self potential of rebar differs from base and patch sides for the chloride ion fixing admixture. Such differences are consid...
The purpose of this study is to investigate the tensile strength and bond strength to cement mortar of bamboo elements treated by emulsions with the glass transition temperature of 4 and 33℃, and the effect of the curing method on the flexural properties of the emulsion treated bamboo-reinforced cement mortars prepared by using the bamboo-reinforce...
This paper proposes an equation for estimating the static modulus of elasticity of porous concretes based on the Hashin-Hansen's equation for two-phase composite materials. The porous concretes using cement mortars as a binder are prepared with various water cement ratios and percentage of target voids. As a result, regardless of the water-cement r...
The purpose of this study is to investigate the influence of the wall effect of mold for specimen on the voids distribution and compressive strength of porous concretes. The relation between the continuous voids, total voids and compressive strength measured by the molded specimens with φ15×20cm, the core specimens with φ10×20cm coring from the φ15...
The purpose of this study is to investigate the effect of percentage of total voids and water-cement ratio on the compressive behavior of porous concrete. The relationship between the compressive strength, static modulus of elasticity and dynamic modulus of elasticity of porous concretes is discussed. The porous concretes using cement mortar as bin...
The purpose of this study is to investigate the flexural properties of bamboo-reinforced cement mortar using polymer-treated bamboo reinforcements. The bamboo elements used for preparing reinforcements and the bamboo reinforcements are treated by SBR latex or PAE emulsion with the applied amounts of 0, 10, 20 and 40g/m2. The bamboo-reinforced cemen...
The purpose of this study is to investigate the effect of combined use of vinylon short-fibers and micro-fibers on the mechanical properties of fiber-reinforced porous concretes. The fiber-reinforced porous concretes using vinylon short-fibers with the length of 40mm (F40) and micro-fibers with the length of 12mm (F12) are prepared with the F40 con...
This paper examined the performance of rust-inhibiting pastes and repair mortars with a calcium-based rust-inhibitor. Polymer-modified pastes and mortars with the rust-inhibitor are prepared as rust-inhibiting pastes and repair mortars. A rebar is treated by the pastes and embedded in the mortars, or a half portion of a rebar embedded in cement mor...
The purpose of this study is to investigate the effect of emulsion treatment for bamboo reinforcement on the freezing and thawing resistance of bamboo-reinforced cement mortars. The bamboo elements and bamboo reinforcements are treated by the emulsion with the polymer coating ratio of 0, 10, 20 and 40 g/mm2 and dried under 20℃ and 60％（RH） for 48h....
The purpose of this study is to investigate the effect of combined use of vinylon short-fibers and micro-fibers on the freezing and thawing resistance of fiber-reinforced porous concretes. The fiber-reinforced porous concretes using vinylon short-fibers with the length of 40mm（F40） and micro-fibers with the length of 12mm（F12）are prepared with the...
This paper proposes a mix design system of vinylon fiber-reinforced porous concretes with exact continuous voids and fiber content. The voids and the fiber content in mix proportions are proposed as factors of the mix design. The correction parameters of the fiber content in the mix proportion are also investigated in consideration of the target vo...
Citations
... However, the addition of NS not only improved the compressive strength but also reduced the rate of decrease in the elastic modulus. This was expected because of the direct relationship between the compressive strength and the elastic modulus in concrete and mortar, which has been confirmed in previous studies [56][57][58]. Fig. 13 shows the changes in the elastic modulus of the rubber mortars compared to the control specimen (NS0-RP0). A maximum drop of 38.5% occurred in the elastic modulus of the mixture with 10% RP without NS. ...
