Systems and methods for treating concrete, which includes the steps of wetting a surface of concrete with a amorphous colloidal silica, allowing time for the colloidal silica to penetrate the concrete surface, and cutting the surface of the concrete with a bladed tool wherein the longitudinal blade portion is positioned approximately at an angle between 30 degrees and 90 degrees relative to the surface of the concrete.

A hard panel of wall and floor structures for reducing floor impact sound according to example embodiments includes patterned layer having different density and elastic modulus form a base layer. A transmission path of an acoustic wave may be changed in a lateral direction by passing the patterned layer and the sound energy is dissipated by the refection, refraction, and cancellation of the acoustic wave. Thus, a noise is reduced.

The hard panel of the wall and floor structures according to example embodiments is effectively reduces the light and heavy impact sounds. In addition, the hard panel is formed by at least one patterned layer to refract and reflect the acoustic wave such that the floor noise may be effectively dissipated. The hard panel is further includes the sound absorbing material to absorb the noise passing through the hard panel such that the floor noise can be effectively reduced.

A system, device, and method for plugging core holes. A core hole plug includes a to compression plate, a bottom compression plate, and a rubber expansion ring that separates the top and bottom compression plates. A beveled screw hole can be created on the top compression plate. The beveled screw hole matches the angle of bottom surface of the head of a flat head bolt to ensure that the bolt remains flush with the top compression plate. The rubber expansion ring can be squeezed between the top and bottom compression plates as the flat head bolt is screwed into a threaded receiver nut formed on the bottom compression plate. An installation tool can be utilized to install the core hole plug so that the top compression plate remains flush with an existing floor surface.

A device for thermally insulating, force-transmitting retrofitting of a second load-bearing construction element to a first load-bearing construction element has an insulation body to be arranged in a construction joint between the construction elements. The insulation body has a casing filled with insulation material. The casing has a first longitudinal side to be arranged at the first construction element and an oppositely positioned second longitudinal side. The casing has a length direction, a transverse direction, and an upright direction perpendicular to length direction and transverse direction. A compression element for transmitting compressive forces between first and second construction elements extends from the first to the second longitudinal side. First tension rods project into the casing at the first longitudinal side and second tension rods project into the casing at the second longitudinal side. A connection arrangement is arranged in the casing for force-transmittingly connecting the first and second tension rods.

A device for thermally insulating, force-transmitting retrofitting of a second load-bearing construction element to a first load-bearing construction element has an insulation body to be arranged in a construction joint between the construction elements. The insulation body has a casing filled with insulation material. The casing has a first longitudinal side to be arranged at the first construction element and an oppositely positioned second longitudinal side. The casing has a length direction, a transverse direction, and an upright direction perpendicular to length direction and transverse direction. A compression element for transmitting compressive forces between first and second construction elements extends from the first to the second longitudinal side. First tension rods project into the casing at the first longitudinal side and second tension rods project into the casing at the second longitudinal side. A connection arrangement is arranged in the casing for force-transmittingly connecting the first and second tension rods.