摘要:
A cement composition is provided which has the property of being inseparable in water, having improved strength and no effect in delaying setting time or reducing strength. It is produced at a cheaper cost by reducing the amount of a polyacrylamide compound to a considerable great extent. The polyacrylamide compound is present in an amount of 0.1 to 3% by weight based on the weight of cement, when a dialdehyde is added thereto.
摘要:
A concrete composition for underwater use contains about 0.1 to 4% by weight based on cement content of a water soluble vinyl polymer containing vinyl units having sulfonic groups. The concrete composition is easy to mix and prevents separation of concrete composition constituents as it is laid under water.
摘要:
A concrete composition is provided which has the property of being inseparable in water and no effect in delaying setting time or reducing strength. A polyacrylamide partial hydrolysate having a molecular weight of one million or higher and a hydrolysis degree of from 0.5 to 20% moles is present in an amount of 0.5 to 4% by weight based on the cement constituent proportion.
摘要:
The present invention provides a method for improving the durability of cement-hydraulic substances, the method decreasing the dry shrinkage of cement-hydraulic-set substances such as concrete, mortar or related substances, and increasing resistance to a repetition of the freezing and thawing of the cement-hydraulic-set substances, by the use of terminal alkyletherified compounds or terminal alkylesterified compounds of polymers having --C.sub.2 H.sub.5 O-- and/or --C.sub.3 H.sub.6 O-- as a repetitive unit.
摘要:
The present invention provides a method for improving the durability of cement-hydraulic substances, the method decreasing the dry shrinkage of cement-hydraulic-set substances such as concrete, mortar or related substances, and increasing resistance to a repetition of the freezing and thawing of the cement-hydraulic-set substances, by the use of terminal alkyletherified compounds or terminal alkylesterified compounds of polymers having --C.sub.2 H.sub.5 O-- and/or --C.sub.3 H.sub.6 O-- as a repetitive unit.
摘要翻译:本发明提供一种提高水泥水泥物质的耐久性的方法,该方法降低水泥 - 水硬性物质如混凝土,砂浆或相关物质的干收缩率,并增加对重复冻融的抵抗力 通过使用末端烷基醚化化合物或具有-C 2 H 5 O-和/或-C 3 H 6 O-的聚合物的末端烷基酯化化合物作为重复单元,水泥水硬性物质。
摘要:
The invention relates to a hydraulic cement composition comprising, as a carbonation inhibitor of the cement composition, at least one compound of the formula (I):A--(Y.sub.n --H).sub.lwherein A is a polyamine residue containing 2-10 carbon atoms,Y is --C.sub.3 H.sub.6 --O--,l is a number equal to 1-8,n is a number equal to 1-4,the product of n.times.l is equal to 13-20,the active hydrogen(s) involved in the amino groups in the polyamine residue being partly or wholly substituted with the residue(s) of propylene oxide.
摘要翻译:本发明涉及一种水硬性水泥组合物,其包含作为水泥组合物的碳酸化抑制剂的至少一种式(I)的化合物:A-(Yn-H)1,其中A是含有2-10个碳原子的多胺残基 ,Y是-C 3 H 6 -O-,l是等于1-8的数,n是等于1-4的数,nx1的乘积等于13-20,参与氨基的活性氢 多胺残基中的基团部分或全部被环氧丙烷的残基取代。