A multi-zone cementitious product, which includes a base zone made of a first cementitious material composition and forming a portion of the product. At least one facing zone is adjacent to and bonded to the base zone, the facing zone made of a second cementitious material composition and forming at least one exterior face of said product which is visible when the product is installed. A disrupted boundary layer is between the facing zone and the base zone, and includes material from both the facing zone and the base zone. The disrupted boundary layer bonds the facing zone to the base zone. The facing zone has a thickness sufficient to prevent the base zone from being visible when the product is installed.

A multi-zone cementitious product, which includes a base zone made of a first cementitious material composition and forming a portion of the product. At least one facing zone is adjacent to and bonded to the base zone, the facing zone made of a second cementitious material composition and forming at least one exterior face of said product which is visible when the product is installed. A disrupted boundary layer is between the facing zone and the base zone, and includes material from both the facing zone and the base zone. The disrupted boundary layer bonds the facing zone to the base zone. The facing zone has a thickness sufficient to prevent the base zone from being visible when the product is installed.

A soundless cracking demolition agent (SCDA) comprising quicklime, water, a viscosity enhancing agent (VEA), a high range water reducing admixture (HRWR) and an anhydrous accelerator component. A method for in-situ leaching and a method for the recovery of unconventional oil or gas utilising the SCDA of the present invention are also described.

The invention provides a novel, steam-assisted production methodology and associated compositions and methods of use in the manufacture of carbonatable or non-carbonatable metal silicate or metal silicate hydrate (e.g., calcium silicate or calcium silicate hydrate) compositions. These metal silicate compositions and related phases are suitable for use hydraulic, partially hydraulic or non-hydraulic cement that sets and hardens by a hydration process, a carbonation process or a combination thereof, and may be applied in a variety of concrete components in the infrastructure, construction, pavement and landscaping industries.

Provided are cementitious panel that include a swellable material within a core layer, a dense layer, and/or a sheet of facing material that make up a cementitious panel, as well as methods of manufacturing such cementitious panels that include a swellable material and methods of providing a moisture or water barrier in a cementitious panel.

A vehicle CO.sub.2 capture and utilization system includes a concrete mixer vehicle and a vehicle exhaust capture system. The concrete mixer vehicle comprises a vehicle exhaust and a mixer tank. The vehicle exhaust capture system is located onboard the concrete mixer vehicle. Additionally, the vehicle exhaust capture system includes one or more fluid pathways that fluidly couple the vehicle exhaust and the mixer tank.

An ultra-light, pourable, self-drying cementitious product with improved density control and ultra-low water demand is provided. Compositions and methods for making the products are provided as well, including compositions and methods with ultra-low water demand.

An ultra-light, pourable, self-drying cementitious product with improved density control and ultra-low water demand is provided. Compositions and methods for making the products are provided as well, including compositions and methods with ultra-low water demand.

A dispersant composition for use in gypsum and/or cementitious compositions that includes, in combination, a polycarboxylate-based superplasticizer and a synergistically effective amount of an aluminum salt. The presence of the aluminum salt, such as aluminum chlorohydrate, improves the performance of the polycarboxylate-based superplasticizer.

A multi-zone cementitious product, which includes a base zone made of a first cementitious material composition and forming a portion of the product. At least one facing zone is adjacent to and bonded to the base zone, the facing zone made of a second cementitious material composition and forming at least one exterior face of said product which is visible when the product is installed. A disrupted boundary layer is between the facing zone and the base zone, and includes material from both the facing zone and the base zone. The disrupted boundary layer bonds the facing zone to the base zone. The facing zone has a thickness sufficient to prevent the base zone from being visible when the product is installed.