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氨基磺酸系高效减水剂的配置技术
来源:http://www.jnjrh.com 日期:2019-06-10 发布人:admin
随着建筑业的疾速开展,对混凝土各方面的性能不时提出了新的请求,如进步混凝土的强度,改善新拌混凝土的和易性,减少混凝土在运输中的塌落度损失等。普通混凝土已难以满足新的施工工艺请求。在混凝土中掺加外加剂是进步混凝土强度、改善混凝土各种性能的有效、烦琐和经济的办法。减水剂是混凝土中用量最大的外加剂种类。目前运用的主要高效减水剂包括改性木素类减水剂、萘磺酸盐甲醛缩合物高效减水剂、三聚氰胺磺酸盐甲醛缩合物高效减水剂及聚羧酸类高效减水剂。
With the rapid development of the construction industry, new requests have been put forward for the performance of concrete from time to time, such as improving the strength of concrete, improving the workability of fresh concrete, reducing the collapse loss of concrete in transportation, etc. It is difficult for ordinary concrete to meet the requirements of new construction technology. Adding admixtures to concrete is an effective, cumbersome and economical way to improve concrete strength and properties. Water reducer is the most used admixture in concrete. The main superplasticizers used at present include modified lignin superplasticizer, naphthalene sulfonate formaldehyde condensate superplasticizer, melamine sulfonate formaldehyde condensate superplasticizer and polycarboxylic acid superplasticizer.
木素系减水剂的主要成分是纸浆废液中的各类木素衍生物,其作为混凝土减水剂已有近六十年的历史。但由于其减水率低,容易形成过度缓凝、混凝土的抗压强度进步幅度小,早期强度偏低,在混凝土中应用遭到了限制,也影响其本身价值的进步。
Lignin series water reducer is mainly composed of various lignin derivatives from pulp waste liquor. It has been used as concrete water reducer for nearly 60 years. However, due to its low water reduction rate, it is easy to form excessive retardation, small progress in the compressive strength of concrete and low early strength, which limits its application in concrete and also affects the progress of its own value.
氨基磺酸
三聚氰胺磺酸盐甲醛缩合物高效减水剂的减水性能优于萘磺酸盐甲醛缩合物高效减水剂。但这种减水剂件原料价钱贵、合成工艺条件请求控制严厉,坍落度损失大,因而,只适用于特殊工程。
The water reducing performance of melamine sulfonate formaldehyde condensate superplasticizer is better than that of naphthalene sulfonate formaldehyde condensate superplasticizer. However, this kind of water reducer is only suitable for special projects because of its high cost of raw materials, strict control of synthetic process conditions and large slump loss.
中国专利93102953.8公开了用链烯基醚与马来酸酐共聚物等聚羧酸类高效减水剂,在低掺量发挥高的塑化效果、活动性坚持性好、水泥顺应性广、减水效率高,但本钱高、价钱贵、操作工艺复杂。
Chinese patent 93102953.8 discloses polycarboxylic acid superplasticizer such as chain alkyl ether and maleic anhydride copolymer. It has high plasticizing effect, good activity persistence, wide cement compliance and high water reducing efficiency at low dosage, but it has high cost, high price and complex operation process.
配置高性能混凝土需求胶合料具有大活动性,可泵性,塌落度的经时损失小,便于浇注等良好的施工性能。这请求减水剂能最大限度的降低混凝土的水灰比,在低水灰比下的混凝土具有较好的活动性,塌落度损失减少,在满足工作性能的前提下,减小混凝土硬化后体积变形,并使混凝土构造密实,强度高,抗渗、抗冻、抗碳化、耐久性好等。
Configuration of high performance concrete needs binder with large activity, pumpability, small time loss of collapse, easy pouring and other good construction performance. This requests that water reducer can reduce the water cement ratio of concrete to the greatest extent. Concrete with low water cement ratio has better mobility and less collapse loss. On the premise of meeting the working performance, it can reduce the volume deformation of concrete after hardening, and make concrete structure compact, high strength, impermeability, frost resistance, carbonization resistance and durability.
目前运用的高效减水剂是以芳香族磺酸盐甲醛缩合物或三聚氰胺磺酸盐甲醛缩合物为主要成分,虽然其减水率较高,但常常本钱高,塌落度损失较大,特别在低水灰比下的活动度差,满足不了高性能混凝土施工的请求;而聚羧酸类的减水剂本钱高,制备工艺复杂。
At present, the high-performance water reducer is mainly composed of aromatic sulfonate formaldehyde condensate or melamine sulfonate formaldehyde condensate. Although its water reduction rate is high, it often has high cost and large collapse loss. Especially under low water cement ratio, its activity is poor, which can not meet the requirements of high performance concrete construction; while polycarboxylic acid water reducer has high cost and complex preparation process.
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