Abstract:
It is described an aqueous mixture or grout containing: a) cementitious material, b) silica sand, c) an aerating agent wherein ii) said aerating agent c) consists of hydrogen peroxide and of a bio-organism containing catalase; iii) said aqueous mixture is obtained without the addition of lime, alkaline and alkaline earth hydroxides and calcium sulphate in hydrated or non-hydrated form. This aqueous mixture is used as starting material in the preparation process of a particular type of autoclaved aerated cement or the autoclaved bioaerated cement here referred to as BAAC.
Abstract:
According to the invention there is provided A hydraulic lime composition including between 1 and 20% by weight of a Pozzolanic material which has a surface area of between 2 and 1000 m 2 g -1 when measured by BET N 2 porosimetry, and an average particle size in the range 0.1 to 1000 μm.
Abstract:
The binder, particularly cement, contains, based on the total weight of the mixture, up to 99 % of cement clinker by weight, from 0.5 to 99 % of fluid fly-ashes by weight, up to 99 % of siliceous fly-ashes by weight and/or calcaeous fly-ashes and/or other components selected from the group comprising slag, pozzolana, tuffs, diatomaceous earth, etc. while the rest consists of impurities. A method for the production of the binder is also claimed.
Abstract:
CMC with CMDS greater than or equal to 0.76, optionally with a non-ionic co-thickener or a CMC with CMDS less than 0.75 is used as both the rheology modifier and partial clay substitute in tape joint compounds. This significant reduction of clay level is sufficient to eliminate most of the negative characteristics of clay in joint compound.
Abstract:
The invention relates to a dry mixture of embedding material or moulding material for producing embedding or moulding material for a metal casting method, such as the lost-wax method, said mixture containing a hydraulic binding constituent. Said binding constituent contains, as a hydraulic binding agent, ground Portland cement clinker which is free of sulfate carriers.
Abstract:
Die Erfindung betrifft eine Einbettungs- bzw. Formmassentrockenmischung zur Herstellung von Einbettungs- bzw. Formmassen für Metallgießverfahren wie das Wachsausschmelzverfahren, aufweisend eine hydraulische Bindemittelkomponente, wobei die Bindemittelkomponente als hydraulisches Bindemittel sulffatträgerfrei vermahlenes Portlandklinkermehl enthält.
Abstract:
A roof cover board made from a mixture of 30-60% stucco; 20-50% perlite; 10-30% cellulose fiber; 3-20% starch; and siloxane. Also disclosed is a stucco-free roof cover board made from a mixture of 30-60% perlite, 30-60% cellulose fiber, 5-25% starch; and siloxane. Also disclosed are methods for making same.
Abstract:
Wallboards, as well as other building materials, are produced by methods which use significantly reduced embodied energy, generating far less greenhouse gases when compared with the energy used to fabricate gypsum wallboard. A novel cementitious core, consisting in one embodiment of post-industrial waste such as slag and combined with pH modifiers, provides a controlled exothermic reaction to create a gypsum- wallboard-like core which can be wrapped in a selected material such as recycled paper and manufactured on a conveyor system to appear, weigh and handle similar to gypsum wallboard, but without the large amounts of energy required to make gypsum wallboard. The manufacturing process results in lower greenhouse gas emissions than the processes used to make gypsum wallboard.
Abstract:
An iron-complexing, pH neutral to basic compound is used as an activator, especially to shorten setting times and increasing the short and long-term strength, in a soluble salt of the carbonic-acid-containing hydraulic binders as an additive. The ferrite content of the binder should be at least 4 % wt. The iron-complexing compound is to be mixed with the binder in the dry state. A hydraulic binder of the invention preferably contains at least 3 mMol% of an iron-complexing compound and a carbonate donor in a molar ratio of between 0.3 and 4 in relation to the iron-complexing compound.
Abstract:
Care is taken with a hydraulic binder based on Portland cement clinker to ensure that the maximum semihydrate content does not exceed a given maximum. A carbonate donor and at least one iron-complexing compound are used as additives to control the properties of the binder. The properties (workability, setting time, short and long-term strength) can be reproducibly set by controlling the semihydrate content. The binders of the invention are distinguished by a low sensitivity of the properties to changes in parameters (e.g water-cement ratio, working temperature).