The present disclosure generally relates to scavenging hydrogen sulfide. The disclosure pertains to non-aqueous and non-volatile compositions that include a monolignol alcohol and hydrogen sulfide scavenging compound. The hydrogen sulfide scavenging compound may be hexamine in some aspects. The compositions may also include a C.sub.2-8 polyol. The compositions disclosed are stable and can be used, for example, in removing hydrogen sulfide from hot asphalt.

A method of providing a chemically inert concrete includes the steps of providing and mixing an aqueous colloidal silica dispersion with a quantity of glass particles. The chemically inert concrete includes, based on dry weight, about 50% to about 95% by weight of the glass particles and about 3% to about 40% by weight of the colloidal silica particles. The chemically inert concrete is substantially or totally free of Group I and Group II metal oxides, exclusive of the glass particles, and is substantially or totally free of cement.

A method of manufacture of Portland cement clinker is described in a dry process that captures the carbon dioxide emitted from the calcination of carbonate minerals, principally limestone. The process uses an indirectly heated, counter-flow reactor to pre-heat and calcine the cement meal to produce a separate calcined meal and carbon dioxide gas stream, with external heat being provided by the combustion of a secondary fuel stream with pre-heated air. This calcined meal is injected into the conventional rotary kiln, where the hot flue gas from combustion of the primary fuel with pre-heated air is used to fuse, react and sinter the powders to form granules of cement clinker. The clinker and carbon dioxide streams are cooled by the air pre-heaters.

The present disclosure is related to a family of oil-based dispersions of organic and inorganic metal compounds for use as a hydrogen sulfide scavenger in asphalt, and the preparation thereof. These dispersions comprise organic and inorganic metal compounds, organic solvents, an organoclay suspension agent, an emulsifier and optionally a polymeric stabilizer. The organic and inorganic metal compounds are in the form of micron-sized particles. Copper-based dispersions are particularly effective at reducing the hydrogen sulfide emission of asphalt in the presence of polyphosphoric acid.

The present concrete composition uses Asian carp fishmeal (the burned remains of the carp) as an admixture. The core principle behind the development of present concrete composition stems from attempting to find a beneficial use for a waste product in a civil engineering application. The incorporation of the fishmeal improves the cementitious properties when added to a concrete mix. Thus, the fishmeal concrete composition incentivizes the harvesting of Asian carp and the production of fishmeal.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for processing recycled concrete aggregate (RCA). A method includes obtaining an aqueous carbonate solution by exposing an aqueous alkaline solution to a carbon dioxide laden fluid; performing a treatment process on a first portion of RCA particles using a first set of parameters, the treatment process including exposing the first portion of RCA particles to the aqueous carbonate solution; after performing the treatment process, obtaining measurements of the first portion of RCA particles; determining, using the measurements of the first portion of RCA particles, a second set of parameters; and performing the treatment process on a second portion of RCA particles using the second set of parameters. Exposing the first portion of RCA particles to the aqueous carbonate solution includes soaking the first portion of RCA particles in the aqueous carbonate solution.

An eco-tile useful for promoting the growth of fauna and flora in an aquatic environment, the eco-tile including at least one type of cement; aggregates comprising at least two fine aggregates and coarse aggregates; and milled incineration sewage sludge ashes, wherein the at least two fine aggregates comprise dredged marine sediment, eco-concrete precursors thereof, and methods of use and preparation of the same.

A method of manufacturing environmentally friendly interior and exterior building materials, includes: preparing agricultural waste of a lignocellulose-containing herbaceous plant; and subjecting the agricultural waste to immersion treatment using a functional immersion solution prepared by mixing purified water, an organic acid or an alkali salt thereof, and a composite natural extract and stirring the mixture.

Provided is a method of producing a roadbed material from which less hexavalent chromium leaches out through use of a crushed product of a cementitious hardened body containing hexavalent chromium as a raw material. The method includes a carbonation treatment step of subjecting the crushed product of the cementitious hardened body to carbonation treatment with a carbon dioxide-containing gas having a temperature of 50? C. to 140? C. and a water content of 1.5% or more to obtain the roadbed material from which less hexavalent chromium leaches out than before the treatment. Preferably, the method includes, before the carbonation treatment step, a crushing step of crushing the cementitious hardened body to obtain a crushed product consisting of grains having a grain size of 100 mm or less at a ratio of 50 mass % or more and a grain size of 2.36 mm or less at a ratio of 1 mass % or more.

Cement compositions that can capture carbon dioxide and related methods are generally described.