Provided is a cement composition that has high fluidity (for example, a 0-drop flow value of 200 mm or more) before curing and exhibits high compressive strength (for example, 320 N/mm.sup.2 or more) after curing. The cement composition includes a cement, a silica fume having a BET specific surface area of from 10 m.sup.2/g to 25 m.sup.2/g, an inorganic powder having a 50% cumulative particle size of from 0.8 m to 5 m, a fine aggregate having a maximum particle size of 1.2 mm or less, a water reducing agent, an antifoaming agent, and water. The ratio of the cement is from 55 vol % to 65 vol %, the ratio of the silica fume is from 5 vol % to 25 vol %, and the ratio of the inorganic powder is from 15 vol % to 35 vol % in the total amount of 100 vol % of the cement, the silica fume, and the inorganic powder.

A method of forming a plurality of cured concrete bodies, each body possessing a cured compressive strength, the disclosed method includes: introducing a flowable mixture of constituent components of the concrete into a plurality of molds; molding the flowable mixture within the plurality of molds with the aid of one or more support, thereby forming a plurality of green bodies; partially curing the green bodies to a degree sufficient to provide a compressive strength that is lower than the cured compressive strength, thereby producing a plurality of pre-cured green bodies; assembling at least a portion of the plurality of pre-cured green bodies to form a collection thereof having a predetermined geometrical configuration; and curing the collection of pre-cured green bodies to a degree sufficient to achieve the cured compressive strength, thereby producing a collection of cured bodies having the predetermined geometrical configuration.

A permeable pavement and cured fiber composition and a related method are provided. The permeable pavement composition includes a quantity of pavement material, and a quantity of cured carbon fiber composite material (CCFCM) configured to be added to the pavement material to produce a reinforced composition having improved characteristics. An example of pavement material includes a pervious concrete material. The method includes providing a quantity of pavement material, and adding a quantity of cured carbon fiber composite material to the pavement material to produce a reinforced composition having improved characteristics.

The present invention discloses a pump-type autoclave system and a providing method for steam and pressure thereof, wherein the pump-type autoclave system comprises an autoclave, a steam providing device and a compressor, said steam providing device comprises a water storage container and a heating device used for heating said water storage container, said water storage container, the compressor and the autoclave are connected through a pipeline to form a closed loop, an inlet of the compressor is connected with a steam output port of the water storage container, an outlet of the compressor is connected to a steam input port of the autoclave, and a condensate water drain outlet of the autoclave is connected to the water storage container. The present invention uses the compressor to depressurize an intermediate-low temperature water source to obtain steam, and the steam is pumped into the autoclave and condensed to release heat to obtain corresponding temperature and pressure. Since the present invention fully utilizes a great amount of low-cost intermediate-low temperature heat sources obtained from natural, industrial or living waste heat to provide needed high temperature, steam and pressure to the autoclave system, the energy is saved.

The invention comprises a method of curing concrete. The method comprises placing a concrete cylinder in an insulated container having a sufficient quantity of water therein so that the concrete cylinder is submerged in and surrounded by the water and selectively adding heat to the quantity of water in an insulated container, so that the temperature of the quantity of water follows a predetermined temperature profile.

Provided are: a system for predicting the residual lifespan of a fire-damaged concrete structure and a method therefor, the system being capable of acquiring sample data by performing a chemical analysis on a sample obtained from the fire-damaged concrete structure, comparing the obtained sample data with data pre-stored in a standardization DB so as to quickly predict the residual lifespan of the fire-damaged concrete structure, and accurately and scientifically assessing the level of fire damage of the fire-damaged concrete structure so as to perform appropriate repair and reinforcement of the fire-damaged concrete structure.

A heavyweight concrete composition comprising cement, steel slag coarse particles, steel slag fine particles, and iron ore aggregate, a wet concrete slurry of water mixed with the heavyweight concrete composition, and a heavyweight concrete which is a cured form of the wet concrete slurry. In the present disclosure, sand, which is used in conventional concretes, is replaced with steel slag fine particles to produce a sand-free heavyweight concrete.

A pultrusion system, in accordance with various embodiments, is disclosed herein. The pultrusion system comprises a pulling mechanism and a slurry infusion bath. The pulling mechanism is configured to grasp and pull a textile through the infusion bath. The pultrusion system may comprise a feeding station to supply the textile to the pultrusion system. The pultrusion system may comprise a water bath configured to improve impregnation of a cement matrix from the slurry infusion bath.

A permeable pavement and cured fiber composition and a related method are provided. The permeable pavement composition includes a quantity of pavement material, and a quantity of cured carbon fiber composite material (CCFCM) configured to be added to the pavement material to produce a reinforced composition having improved characteristics. An example of pavement material includes a pervious concrete material. The method includes providing a quantity of pavement material and adding a quantity of cured carbon fiber composite material to the pavement material to produce a reinforced composition having improved characteristics.

The invention provides novel articles of composite materials having hollow interior channels or passageways, or otherwise being hollowed out, and formulations and methods for their manufacture and uses. These hollow core objects are suitable for a variety of applications in construction, pavements and landscaping, and infrastructure.