A plasterboard includes a first layer of plaster and a second layer of plaster, wherein the first layer includes activated carbon; the second layer includes a scavenging agent, wherein a content of scavenging agent in the first layer, expressed as percentage by weight of dry matter, is less than a content of scavenging agent in the second layer, and wherein the second layer is free of activated carbon.

Methods for joining a first ceramic component to a second ceramic component to form a unitary ceramic component are provided. The method includes positioning a bonding sheet between a first ceramic component and a second ceramic component. The bonding sheet defines a plurality of voids. The method also includes densifying the bonding sheet with an infiltrate composition at a densification temperature to form a bonding interface comprising a ceramic material that forms a bonding interface between the first ceramic component to the second ceramic component into a unitary ceramic component.

Set forth herein are methods for producing low-carbon concrete components comprising a cementitious mixture of industrial solid wastes such as coal combustion residues, lime, kiln dust, and gypsum. These cementitious mixtures are a substantial replacement for Portland cement-based concrete mixtures. The methods herein include mixing materials, pressing, and shaping the mixed materials into a structural concrete component, and exposing the structural component to carbon dioxide. The CO.sub.2 may be sourced from CO.sub.2 emission sources (e.g., waste CO.sub.2-containing gas stream, dilute flue gas stream, a concentrated CO.sub.2 gas stream, a commercially available CO.sub.2 source, liquefied CO.sub.2, or from the atmosphere) to harden and thereby form structural concrete components. In some examples, the finished concrete components (e.g., concrete block) are compliant with industry-standard requirements for use in construction applications and feature significantly lower carbon intensity compared to traditional cement-based concrete components.

The disclosure provides an ultralow-carbon clinker-free cement, prepared from the following raw materials: granulated blast-furnace slag, gypsum and calcium oxide-based materials. The granulated blast-furnace slag accounts for 65%-95% of the total weight of the raw materials, the gypsum accounts for 4.5%-34.5% of the total weight of the raw materials, and the balance is the calcium oxide-based material. A weight percentage of calcium oxide and/or calcium hydroxide in the total weight of the raw materials is controlled to be 0.05%-0.75%. The disclosure further provides a method for preparing the ultralow-carbon clinker-free cement and application of the ultralow-carbon clinker-free cement in the preparation of concrete, mortar or cement products. The ultralow-carbon clinker-free cement of the disclosure has the advantages of high early strength, ultrahigh long-term strength, low shrinkage, carbonation resistance, low carbon emissions, etc.

Disclosed is a preform for a ceramic matrix composite including direct channels extending from an exterior surface of the preform to an interior space of the preform wherein the direct channels are free of char.

Systems and methods for beneficiating a recovered fly ash material and/or recovering fly ash from an impound site are described. The method may include thermally treating a first portion of a recovered fly ash material to form a thermally treated fly ash having a first temperature of at least 1000 F., and contacting the thermally treated fly ash with a second portion of the recovered fly ash material to cool the thermally treated fly ash to a second temperature of less than or equal to 500 F. and form a fly ash product. The fly ash product may have a carbon content less than 8% by weight, based on the total dry weight of the fly ash product.