Abstract: Provided is a toner comprising a toner particle comprising a binder resin and a. silica fine particle, wherein a total content of a polyvalent metal elements in the toner particle is 0.10 to 2.50 ?mol/g, a number-average particle diameter of a primary particle of the silica fine particle is 40 to 500 nm, and in the DD/MAS measurement of solid 29Si-NMR of the silica fine particle, peak PD1 corresponding to a silicon atom represented by Sia in a structure represented by formula (1) and peak PD2 corresponding to a silicon atom represented by Sib in a structure represented by formula (2) are observed, and when an area of the peak PD1 is defined as SD1 and an area of the peak PD2 is defined as SD2, SD1 and SD2 satisfy: 1.2?(SD1+SD2)/SD1?10.0.

Abstract: The toner contains binder resin-containing toner particles and silica fine particle S1, wherein the weight-average particle diameter of the toner is 4.0-15.0 ?m, both inclusive, peaks originating with the silica fine particle S1 are observed in 29 Si-NMR measurement of the silica fine particle S1, and, in the spectrum obtained by 29Si CP/MAS NMR or 29Si DD/MAS NMR, the peak area of a peak corresponding to the D1 unit structure in the silica fine particle S1, the peak area of a peak corresponding to the D2 unit structure in the silica fine particle S1, and the peak area of a peak corresponding to the Q unit structure in the silica fine particle S1 satisfy a prescribed relationship.

Abstract: A method of constructing a floor for concrete buildings or similar structures is disclosed, wherein a precast reinforced concrete slab is placed on and between at least two steel or concrete beams or girders and then a ready mixed concrete is poured as cast-in-place concrete and cured thereon to form the floor intergal with said precast concrete slab.