摘要:
Provided is a cement additive that can suppress the production of Glauber's salt as a by-product, and that can express excellent retention when turned into a cement composition. Also provided is a cement composition including such cement additive. Also provided is a raw material for a cement additive to be used in such cement additive. The cement additive of the present invention includes: a polycarboxylic acid-based copolymer (A) having a structural unit (I) derived from an unsaturated polyalkylene glycol-based monomer (a) represented by the specific general formula (1) and a structural unit (II) derived from an unsaturated carboxylic acid-based monomer (b) represented by the specific general formula (2); and an alkanolamine compound (B), in which a content of the structural unit (II) with respect to a total amount of the structural unit (I) and the structural unit (II) is 60 mol% or less.
摘要:
A hydraulic setting adhesive containing a hydraulic binder, fillers, a water retention agent, a sulfoalkylester surfactant, and optionally a redispersible polymer powder and/or a polymer dispersion, wherein the surfactant is represented by the formula of MSO3—R1—(—COOR2)n, wherein M is selected from the group consisting of hydrogen, alkali metals, alkaline earth metals, and ammonium; R1 is linear or branched, saturated or unsaturated C1-C10 alkylene that optionally can be substituted by one or more hydroxyl, halogen, nitro or cyano groups; R2 can be identical or different from R1 and is represented by C1-C22 linear or branched alkyl; and n is an integer from 1 to 10, and wherein the hydraulic setting adhesive based on its dry weight comprises 0.1-3% by weight of the water retention agent.
摘要:
The present invention relates to the use of amphiphilic sequenced copolymers as an agent for controlling the filtrate in a fluid (F) injected under pressure into an underground formation, comprising - at least one chain (C) soluble in the fluid (F); and - at least one block (B) that is insoluble in the fluid (F).
摘要:
Provided is a hydraulic composition using cement including a pozzolanic substance, the fluidity retention thereof being excellent and the setting retardation thereof being controlled. This is a hydraulic composition comprising a high-range water-reducing agent, an oxycarboxylic acid, and cement including a specified percent of a pozzolanic substance. This provides excellent fluidity and fluidity retention.
摘要:
L'invention concerne un béton comprenant un liant, des granulats d'origine agrosourcée et un accélérateur de durcissement. Ce béton respectueux de l'environnement possède de bonnes propriétés mécaniques. Il peut être avantageusement utilisé comme matériau de construction tel que les blocs de maçonnerie porteurs.