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Studies of Modified Lignosulfonates and Their Capabilities

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Tutor: WangLiJiu
School: Dalian University of Technology
Course: Building Materials
Keywords: Lignosulfonate,Chemically modified,Composite modified,Biodegradable modified,Sup
CLC: TU528.042.2
Type: Master's thesis
Year:  2005
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As early as in the 12th century , the Southern Song Dynasty in China famous scholar Zhu Xi had asked the days discarded , and now the waste of resources and increasingly widespread ; At the same time, the rapid development of the green ecological concrete the , making superplasticizer said beneficially prominent. However, pulp waste - lignosulfonate as concrete water reducer due to excessive retarding and reduce the strength of concrete and other shortcomings , limits its application , resulting in a huge waste of resources , modified lignin sulfonate sexual imperative. This thesis a systematic study of the modified method of lignin sulfonate , including chemical modification , the composite modified and biodegradable the modified three methods were tested modified products of cement, concrete performance and explore the mechanism of action of the lignin superplasticizer ; broke through the traditional method to add a single functional groups for the purpose of chemical modification , while increasing the high water-reducing properties of the -COOH and - SO 3 < / sub > H , the lignin sulfonate performance has been greatly improved , concrete water-reducing rate of 21.2% when the dosage is 0.5 % , 7 and 28 days compressive strength were 119 and 116 , close to naphthalene superplasticizer level ; composite modification were studied before and after modification of lignin sulfonate of naphthalene and polycarboxylate superplasticizer the joint action , which modified material / naphthalene superplasticizer = 0.2% / 0.2% , modified product / polycarboxylic acid = 0.2 % / 0.06% , the concrete water reducing rate reached 23.0% and 20.0% , 7 day and 28 day compressive strength than the former 115 and 103 , respectively , after who were 111 and 102 ; recent years, although the biodegradation of lignin become a hot spot , but modified products used as concrete water reducer is always no one try . Repeatedly through the mechanism of biodegradation studies , combined with the characteristics of the lignin superplasticizer , the feasibility of a biodegradable product as a concrete superplasticizer , and confirmed by experiment , when the degradation product content of 0.5 % , the cement fluidity of 180mm, 52mm improved compared with unmodified . Lignosulfonate modified effective, can lay the foundation for future research , in particular, provides a basis for future biodegradable the lignin sulfonate product as concrete water reducer .
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