The invention relates to fresh concrete which contains in 1 m.sup.3 135 to 250 kg of water, 135 to 400 kg of cement or 135 to 455 kg of a mixture of cement and substituents of cement in a ratio of cement to substituents of cement from 30:70 to 70:30, 28 to 52 kg of microsilica and 1000 to 2000 kg of aggregate with upper fraction of up to 16 mm, or up to 8 mm, whereby 70 to 100% of this aggregate is formed by brick or ceramic or mixed recyclate made from inert construction and demolition waste with a fraction of 0 to 16 mm, or 0 to 8 mm and/or concrete recyclate with a fraction of 0 to 16 mm, or 1 to 16 mm, or 0 to 8 mm, or 1 to 8 mm. A possible remaining part of the aggregateup to a maximum of 30% by weight, is formed by natural aggregate with upper fraction of up to 16 mm or up to 8 mm. Another 0 to 30% by weight of the aggregate may be made up of at least one known improving component which enhances thermal and/or acoustic and/or fire resistance properties of concrete and which is commonly used in standard concretes.

The invention also relates to a dry mixture for the preparation of this concrete, as well as a concrete product or a prefabricated element made from this concrete.

In addition, the invention relates to a method for the preparation of this fresh concrete.

An embodiment includes a Class C fly ash (CFA) cementitious composition with a controllable setting time comprising at least one Class C fly ash; at least one alkali hydroxide; at least one source of phosphate; and water. Alternate embodiments include a Class C fly ash (CFA) cementitious composition with a solid activator comprising at least one Class C fly ash; at least one alkali carbonate; at least one source of phosphate; and water.

A geopolymer thermal energy storage (TES) concrete product comprising at least one binder; at least one alkali activator; at least one fine aggregate with high thermal conductivity and heat capacity; and at least one coarse aggregate with high thermal conductivity and heat capacity.

Disclosed are binders and methods for making such binders with crude sterols. The crude sterols improve various rheological properties of the binders. The disclosure provides a method for slowing the aging rate of aged asphalt binder comprising adding a crude sterol to an asphalt binder, wherein the asphalt binder comprises both virgin asphalt binder, and reclaimed asphalt binder material comprising asphalt pavement (RAP), asphalt shingles (RAS) or combinations of RAP and RAS.

Disclosed are binders and methods for making such binders with crude sterols. The crude sterols improve various rheological properties of the binders. The disclosure provides a method for slowing the aging rate of aged asphalt binder comprising adding a crude sterol to an asphalt binder, wherein the asphalt binder comprises both virgin asphalt binder, and reclaimed asphalt binder material comprising asphalt pavement (RAP), asphalt shingles (RAS) or combinations of RAP and RAS.

An ultra-high performance concrete (UHPC) with waste brick powder and preparation method and application thereof are provided, which relates to the technical field of concrete. The preparation method includes the following steps: stimulating activity of a brick powder by a method of mechanically stimulating activity to obtain waste brick powder; and preparing UHPC according to a mass ratio of cement to waste brick powder of 5:5-7:3 to obtain the UHPC with waste brick powder. The UHPC is prepared by treating waste bricks from construction waste (mechanically stimulating activity) to make waste brick powder with activity, therefore partially replacing cement. The UHPC is applied in a construction field.

An ultra-high performance concrete (UHPC) with waste brick powder and preparation method and application thereof are provided, which relates to the technical field of concrete. The preparation method includes the following steps: stimulating activity of a brick powder by a method of mechanically stimulating activity to obtain waste brick powder; and preparing UHPC according to a mass ratio of cement to waste brick powder of 5:5-7:3 to obtain the UHPC with waste brick powder. The UHPC is prepared by treating waste bricks from construction waste (mechanically stimulating activity) to make waste brick powder with activity, therefore partially replacing cement. The UHPC is applied in a construction field.

The present invention relates to methods for the production of air-cured fiber cement products. More particularly, the present invention provides methods for the production of air-cured fiber cement products, at least comprising the steps of: (a) Providing cured fiber cement powder by comminuting cured fiber cement material; (b) Providing an aqueous fiber cement slurry comprising water, cementitious binder, natural or synthetic fibers and between about 5M % and about 40M % of said cured fiber cement powder; (c) Providing a green fiber cement sheet; and (d) Air-curing said green fiber cement sheet thereby providing an air-cured fiber cement product.

The present invention relates to methods for the production of air-cured fiber cement products. More particularly, the present invention provides methods for the production of air-cured fiber cement products, at least comprising the steps of: (a) Providing cured fiber cement powder by comminuting cured fiber cement material; (b) Providing an aqueous fiber cement slurry comprising water, cementitious binder, natural or synthetic fibers and between about 5M % and about 40M % of said cured fiber cement powder; (c) Providing a green fiber cement sheet; and (d) Air-curing said green fiber cement sheet thereby providing an air-cured fiber cement product.

The present invention relates to methods for the production of air-cured fiber cement products. More particularly, the present invention provides methods for the production of air-cured fiber cement products, at least comprising the steps of: (a) Providing cured fiber cement powder by comminuting cured fiber cement material; (b) Providing an aqueous fiber cement slurry comprising water, cementitious binder, natural or synthetic fibers and between about 5M % and about 40M % of said cured fiber cement powder; (c) Providing a green fiber cement sheet; and (d) Air-curing said green fiber cement sheet thereby providing an air-cured fiber cement product.