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1、Engineering Master Dissertation ofChongqing UniversityResearch on poly-carboxylicsuper-plasticizers applicationin Guizhou regionMaster Candidate: Fu PeigenSupervisor: Associate Prof. Lu JianPluralistic Supervisor: Professorate Senior Eng.Li GuangmingSpecialty: Material Science EngineeringCollege of
2、Material Science EngineeringChongqing UniversityOctober 2007摘要贵州地区，地处偏远，混凝土配制材料较其它地区差：主要表现在水泥生产质量控制方面较东部发达地区差；细集料采用山砂，表面形状棱角多、圆润度差、且级配差，因此在混凝土制备方面存在局限性，配制的混凝土和易性差，坍落度损失大。而聚羧酸系高效减水剂是国内外公认的新型、绿色环保型减水剂，具有低掺量、高减水率、分散保持性能好、坍落度损失小、水泥适应性广等特点，具有良好的研究与应用前景。目前，聚羧酸高效减水剂在贵州地区并未推广应用，本论文率先研究了聚羧酸高效减水剂与贵州地材的适应性，并对其
3、在贵州地区的应用进行了混凝土配合比设计。本论文首先通过水泥净浆和砂浆实验研究了聚羧酸高效减水剂与贵州地材的适应性，结果表明，该实验所用聚羧酸高效减水剂具有掺量低，减水率高，与贵州地产胶凝材料适应性广，且有效解决了山砂含泥、粉量重影响拌制砂浆、混凝土流动性差的问题。其次，本论文通过正交实验，重新设计了聚羧酸高效减水剂在贵州地区应用的混凝土配合比，结果表明，聚羧酸高效减水剂的应用降低了水泥用量和用水量，并且在掺合料增大的情况下，提高早期和后期强度。再者本论文中对比了萘系高效减水剂配制的混凝土，无论在新拌混凝土的和易性，坍落度保持性能，压力泌水率，含气量等方面，还是在硬化混凝土，强度、抗渗、抗冻性等
4、方面，聚羧酸高效减水剂配制的混凝土都具有较大优势。在此基础上，论文对聚羧酸高效减水剂在贵州地区配制高强混凝土做出了研究，在低水胶比的情况下，采用矿粉作为掺合料，不仅在强度上能够满足要求，更重要的是解决了硅灰配制高强混凝土的粘度过高的问题，为贵州地区的高强混凝土配制提供了指导意见。关键词：聚羧酸高效减水剂，水泥，山砂，适应性，正交设计，混凝土ABSTRACTGuizhou, being located remote, is relatively poorer than other areas in theconstituent materials of concrete: the cement
5、product quality control is laggardcompared with the developed eastern regions; the fine aggregate is almost mountainsand which has poorer particle shape and grading and its content of clay and powderweighs heavier. Therefore, the limitations exist in concrete preparation, which leads topoor workabil
6、ity and a great slump loss. However, it has been internationallyacknowledged that the poly-carboxylic super-plasticizer is a kind of new greenenvironment-friendly water-reducing admixture which provides lower mix proportion,higher water-reducing rate, better scattered maintaining performance, less s
7、lump lossand more comprehensive cement adjustability, which illustrates a favorable research andapplication prospects. Currently, the poly-carboxylic super-plasticizer has still not beenpopularly applied in Guizhou district and this paper has taken the lead in doing researchon the adaptability betwe
8、en the poly-carboxylic super-plasticizer and local materials inGuizhou and the regions concrete mix proportion design.Firstly, through the cement paste and mortar experiment, the adjustability betweenpoly-carboxylic super-plasticizer and local materials in Guizhou is studied in this thesis,the resul
9、ts of which suggest that poly-carboxylic super-plasticizer can achieve the goalsof low mixing proportion, high water-reducing rate and wide adjustability with theGuizhou local binding materials. It has effectively solved the problem of bad fluidity inmixing mortar and concrete caused by the higher c
10、ontent of clay and powder inmountain sand. Secondly, in this thesis through the orthogonal experiments the mixproportion for the concrete applying poly-carboxylic super-plasticizer in Guizhouregion is redesigned and the results has demonstrated that the application ofpoly-carboxylic super-plasticize
11、r has decreased the dosage of both cement and waterand the initial and final strength will increase with the additives increasing. Furthermore,a contrast with the concrete using the naphthalene super-plasticizer has also been carriedon in this thesis and it has proved the fact that concrete mixed wi
12、th poly-carboxylicsuper-plasticizer relatively prevails in both fresh concrete performance like workability,slump maintenance, compressive bleeding rate, air content, etc. and hardened concretesproperties such as strength, permeability, freezing resistance and so on. On the basis ofthe former study,
13、 this thesis has worked on the preparation of High PerformanceConcrete with poly-carboxylic super-plasticizer in Guizhou region: in the cases of lowwater-gel ratio and slag powder as additives, the HPC can achieve the required strengthand what is more important is that the problem of higher viscidit
14、y in HPC preparationcaused by adding silica fume has been successfully solved, which has provide guidancefor the preparation of HPC in Guizhou region.Key words: poly-carboxylic super-plasticizers, cement, mountain sand, adjustability,orthogonal design, concrete目录摘要 .IABSTRACT. II1序论 . 11.1 高效减水剂的概述 .
