混凝土减水剂的发展与绿色化

混凝土实现绿色化生产,对节约资源、能源和保护环境具有特别重大的意义。为适应绿色高性能混凝土发展的需要,混凝土外加剂的绿色化也成为必然。本文概述了促进我国绿色高性能混凝土发展的绿色减水剂的发展与最新研究成果,并讨论了应进一步研究的问题。分析认为,沿用多年的萘系高效减水剂并不符合减水剂绿色化的要求,寻求其替代品是当今减水剂工作者的重要任务。从资源、环境和安全等绿色化发展的角度,改性木素磺酸盐高效减水剂最具生命力;然而,消除改性木素磺酸盐过度缓凝性使之适应于高强混凝土、以木素替代全部或部分苯酚生产氨基磺酸系减水剂、控制脂肪族高效减水剂中残余甲醛及其回收利用、利用工业副产品替代昂贵的石油基原料对现有的聚羧酸系高效减水剂的改性或开发新型高性能减水剂是实施高效减水剂绿色化所面临的长期而艰巨的挑战。

Progress of Superplasticizer for Concrete and Its Challenges of Greening

It is inevitable to use green chemical admixture for concrete to meet the demands for the development of green high performance concrete. The progress,the recent achievements and the problems of green concrete superplasticizer were summarized. The analytical results show that seeking substitutes for naphthalene based superplasticizer is the major task for the superplasticizer researchers. From the perspectives of resource,environment and safty,the modified lignosulfonate is of vitality in superplasticizer for concrete. However,the long-term and arduous challengers for green superplasticizers are faced by eliminating the excessive retardation action of modified lignosulfonate,substituting or partly substituting for phenol by lignin in the preparation of aminosulfonate based superplasticizer,controlling and recycling the residual formaldehyde in the products of Aliphatic superplasticizer,substituting for materials from petroleum by by-products for manufacturing the polycarboxylic series superplasticizer and developing some new superplasticizers.