摘要:
Many types of artificial reefs have been deployed in the world's oceans, bays and estuaries. These range from sinking ships to dispersing old building debris. In most approaches, the material placed in the marine environment lacks any nutrients needed for growth or concern regarding proper chemical conditions necessary to start and sustain life. In this discovery, concrete is made from both inorganic and organic components. The inorganic components are selected to include species that will be used to create a receptive surface to start and sustain life. Moreover, other conditions such as pH, chemical toxicity, nutrient levels and biodegradability are considered in the formulation. Additionally, there is an organic component that is part of the concentration mixture which provides trace nutrients and serves to weaken the structures so it will biodegrade over time. The biodegradable concrete slowly releases small quantities of resources (over months and years) providing a steady flux of essential nutrients.
摘要:
The present invention relates to the use of a composition for stabilizing a geological formation in oil fields, gas fields, water pumping fields, mining or tunnel constructions. The composition has a hardening temperature in the range from about 40 °C to about 120 °C and can therefore be used to stabilize a geological formation in oil fields, gas fields, water pumping fields as well as in mining or tunnel constructions.
摘要:
A cement composition based on a sulfoaluminate clinker is described, together with its use for agglomerating and inerting sediment /dredging sludge, and the relative inerting method and apparatus.
摘要:
The present invention relates to an additive for hydraulically setting compositions, comprising a colloidally disperse preparation of at least one salt of a mono-or polyvalent metal cation and of at least one compound which is able to release an anion which forms a low-solubility salt with the metal cation,and of at least one polymeric sulphonated dispersant. The additive is suitable particularly as a slump retainer.
摘要:
A proposal is made for a cementitious system which comprises accelerator particles coated with crosslinked shellac, for the use as an additive component which comprises the accelerator particles coated with crosslinked shellac, and for a cement slurry which comprises the cementitious system and water.
摘要:
An expanded lightweight aggregate has compositional ranges (Wt. % Range) of about: (a) 40 to 60% ground glass or pumice, 40 to 60% water, 3 to 15% sodium silicate, and 0.1 to 5% NaNO 3 for the slurry; and (b) 50 to 85% ground glass or pumice, and 15 to 50% slurry for the granulator.
摘要:
Ein luftporenbildendes Mittel, insbesondere für zementöse Systeme, enthält mindestens einen Luftporenbildner mit aufschäumender Wirkung, mindestens einen Luftporenbildner mit entschäumender Wirkung sowie Wasser.
摘要:
The present invention relates to a multi-purpose mortar or cement composition for (i) inhibiting the corrosion of steel in mortar or cement structures, (ii) repairing, filling and/or spraying damages, cracks, flaws and cavities in mortar or cement structures and/or (iii) surfacing, coating and/or protecting mortar or concrete surfaces. The present invention further relates to methods of preparation and use of the multi-purpose mortar or cement composition.
摘要:
Cementitious compositions and processes for preparing and using the cementitious compositions are provided. The cementitious compositions are characterized by the property of a reduced or an attenuated water vapor emission from a cementitious mix and a concrete formed therefrom. Certain cementitious compositions are characterized by the property of accelerated drying while still maintaining good workability. Methods of improving water retention and surface drying of concrete, including lightweight concrete are provided. A water soluble ionic salt may be used to sequester water within the pores and capillaries of the cement paste and/or porous lightweight aggregate. In some examples, the salt may be added directly to concrete or aggregates may be infused with a water-salt solution to provide treated porous aggregates having improved water saturation and water retention.