This disclosure is directed to an improved ballistic construct including ballistic concrete cured in a ballistic fiberglass mold, where the ballistic fiberglass mold remains part of the construct after curing. The fiberglass ballistic construct is stronger than concrete alone and does not significantly increase the weight of the construct. The improved construct is useful for firearms training and in the erecting of bulletproof structures which need ballistics protection.

A reduced carbon emission concrete including a novel combination of novel binder and rock quarry waste as the aggregate. The novel binder includes cements, lime and slag. Reducing carbon emission in all stages of concrete based walkways and paths construction, starting from the materials creating the concrete through the method of construction and included elements.

A reduced carbon emission concrete including a novel combination of novel binder and rock quarry waste as the aggregate. The novel binder includes cements, lime and slag. Reducing carbon emission in all stages of concrete based walkways and paths construction, starting from the materials creating the concrete through the method of construction and included elements.

A repaired reinforced concrete structure is provided which includes one or more reinforcing steel bars of cross-sectional area A.sub.x, the one or more reinforcing steel bars having one or more corroded sections of cross-sectional area A.sub.y, wherein A.sub.y is greater than or equal to approximately 0.6 A.sub.x. A reinforced ordinary Portland cement-based repair mortar is positioned directly on the one or more corroded sections of the one or more reinforcing steel bars without the addition of a lapped reinforcing steel bar. The reinforced repair mortar includes at least approximately 1 percent by volume of reinforcing steel fibers such that the reinforced repair mortar restores a strength of a repaired region to greater than approximately 100% of an original strength of the concrete structure in an uncorroded state. The repaired reinforced concrete structure is highly durable, as the repair mortar exhibits an air permeability resistance of greater than 1000 seconds.

A repaired reinforced concrete structure is provided which includes one or more reinforcing steel bars of cross-sectional area A.sub.x, the one or more reinforcing steel bars having one or more corroded sections of cross-sectional area A.sub.y, wherein A.sub.y is greater than or equal to approximately 0.6 A.sub.x. A reinforced ordinary Portland cement-based repair mortar is positioned directly on the one or more corroded sections of the one or more reinforcing steel bars without the addition of a lapped reinforcing steel bar. The reinforced repair mortar includes at least approximately 1 percent by volume of reinforcing steel fibers such that the reinforced repair mortar restores a strength of a repaired region to greater than approximately 100% of an original strength of the concrete structure in an uncorroded state. The repaired reinforced concrete structure is highly durable, as the repair mortar exhibits an air permeability resistance of greater than 1000 seconds.

A concrete-based composite material including iron rich particles is characterized by an iron content greater than 17% by weight of the composite material, can include iron particles which are an iron by-product recovered from iron slag material, can include iron rich particles which have an iron content of at least 60% by weight of the iron rich particles, and/or can include iron particles having a particle size distribution in the range of about −⅜ inch to +60 mesh or in the range of about −20 mesh to about +60 mesh. The composite material can include ground granulated blast furnace slag as a portion of the cementitious component of the composite material. A method of forming a structural element from the composite material includes casting the structural element such that the structural element is characterized by a ballistic performance of Level 10 as defined by Underwriters Laboratories standard UL752.

The invention relates to radiation-treated reinforcement fibers, reinforced asphalt and portland cement concrete, and grout, methods for producing the same and application for their use. The radiation treatment includes exposing reinforcement fibers to electromagnetic energy, e.g., gamma rays, and/or electron-beam (E-beam) radiation. As a result of the treatment, the radiation-treated reinforcement fibers have a modified or deformed surface, e.g., an abraded and/or porous surface, as compared to reinforcement fibers without a radiation treatment.

Cement slurries are prepared that comprise water, a hydraulic cement, particles of an oil-absorbent particles and non-swellable hydrophobic particles. The particles are present in an amount sufficient to alter a property of a non-aqueous drilling fluid. The cement slurry is placed in a subterranean well, whereupon the slurry contacts residual drilling fluid on casing and formation surfaces. The oil-absorbent particles and hydrophobic particles in the cement slurry may reduce the mobility of the drilling fluid, thereby improving zonal isolation.

A roof tile containing fibers which satisfy the following requirements (1) to (3): (1) to have an average fiber diameter of 50 μm or less; (2) to have an aspect ratio of 50 to 2000; and (3) to have three or less buckled portions per fiber.

A roof tile containing fibers which satisfy the following requirements (1) to (3): (1) to have an average fiber diameter of 50 μm or less; (2) to have an aspect ratio of 50 to 2000; and (3) to have three or less buckled portions per fiber.