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Scientific Research on Quality Improvement of Concrete by Utilization of Pulverized Coal Ash

利用粉煤灰提高混凝土质量的科学研究

基本信息

批准号：
17560518
负责人：
KASAMI Hideo
金额：
$ 2.25万
依托单位：
Kogakuin University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-17560518/
关键词：
Fly Ash Workability Compressive Strength Modulus of Elasticity Carbonation Placing on consolidated fresh Concrete Deterioration due to High Temperature Replacement Ratio フライアツイュ石炭灰コンクリート減水効果耐久性高性能AE減水剤単位水量乾燥収縮アルカリ骨材

项目摘要

Following (1)~(7) studies was performed in three years from 2005 to 2007.(1) Reference study about pulverized coal ash:Documents investigation of internal and external article, report and standards was performed.(2) Fact-findings about pulverized coal ash:The actual situation of the coal ash all over Japan was investigated, and FA class I was 25%, FA class II was 62%, FA class III was 0% and FA class IV was 25%, and the average fineness of FA class II was clarified approximately 3,800 cm^2/g.(3) Experimental study about strength property of concrete with extensive use of pulverized coal ash:Three series of experiment was made, such as influence of extensive use, strength development and retaining period of formwork, and excessive addition.Compressive strength deteriorates with the replacement ratio, but becomes equivalent with other cement when replacement of 15% in age of 91 days with same W/C and suggested the calculation chart of strength revision T and retaining period of formwork, … More and showed the degree of harmful influence by excessive mix.(4) Experimental study about carbonation of concrete with extensive use of pulverized coal ash:Three series of experiment was made, and clarified the phenomena such as reduce of drying shrinkage, increase of carbonation and decrease of freeze-thaw resistance.(5) Experimental study about quality improvement effect of concrete using pulverized coal ash:Effect of fineness, effect of water content to drying shrinkage, quality improvement effect, and bond strength of placing on consolidated fresh concrete by these four series of experiment reduce of drying was clarified.(6) Experimental study about high temperature deterioration of concrete using pulverized coal ash:The compressive strength and young's module reduction of after long-term high temperature heating from 20-300 degrees Celsius was lower than four types of cement were clarified.(7) Experimental study about inhibitive effect of Alkali-Silica Reaction by pulverized coal ash:The inhibitive effect at replacement rate 15% of class II in inhibitive effect of class I, class II and class III to normal reactive aggregates was showed. Less

2005年至2007年的三年中进行了以下（1）~（7）研究。(1)粉煤灰的文献研究：对国内外有关粉煤灰的文献、报告和标准进行了文献调研。(2)关于粉煤灰的调查结果：对全日本的粉煤灰的实际情况进行了调查，发现FA I级为25%，FA II级为62%，FA III级为0%，FA IV级为25%，FA II级的平均澄清度约为3,800 cm^2/g。(3)大掺量粉煤灰混凝土强度性能的试验研究：进行了大掺量粉煤灰混凝土强度的影响、模板强度发展与保留期、过量掺量粉煤灰混凝土强度的试验研究，结果表明：粉煤灰混凝土强度随粉煤灰掺量的增加而降低，但在相同水灰比条件下，掺量为15%、龄期为91 d时，粉煤灰混凝土强度与其它水泥相当，并提出了强度修正值T与模板保留期的计算图表。 ...更多信息并显示了过度混合的有害影响程度。(4)大掺量粉煤灰混凝土的碳化试验研究：通过三个系列的试验，阐明了粉煤灰混凝土的干燥收缩减小、碳化增强和抗冻融性降低等现象。(5)粉煤灰对混凝土质量改善效果的试验研究：通过四个系列的试验，阐明了粉煤灰细度、含水量对干燥收缩的影响、粉煤灰对新拌混凝土的质量改善效果、粉煤灰对新拌混凝土的粘结强度的影响。(6)粉煤灰混凝土高温劣化的试验研究：明确了粉煤灰混凝土在20-300 ℃长期高温加热后的抗压强度和杨氏模量降低率低于四种水泥。(7)粉煤灰抑制碱-硅反应的试验研究：粉煤灰对Ⅰ、Ⅱ、Ⅲ类活性集料的抑制作用中，Ⅱ类替代率为15%时，对普通活性集料的抑制作用最好。少