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年三年间，进行了以下（1）~（7）项研究。（1）粉煤灰参考研究：进行了国内外文章、报告、标准等资料调查。（2）粉煤灰实况调查粉煤灰：调查了日本各地粉煤灰的实际情况，FA一级为25%，FA二级为62%，FA三级为0% FA IV级为25%，澄清FA II级平均细度约为3800 cm^2/g。 (3)大量使用粉煤灰混凝土强度性能试验研究：进行了三个系列的试验，如广泛使用、模板强度发展和保留期的影响、过量添加等。抗压强度随更换率而下降，但在龄期更换15%时与其他水泥相当。 91天，相同W/C，并提出了强度修正T和模板保留期的计算图，… 更多，并显示了过量混合的有害影响程度。（4）大量使用煤粉的混凝土碳化试验研究灰：进行了三个系列的试验，明确了干燥收缩减少、碳化增加、抗冻融性能下降等现象。（5）煤粉混凝土质量改善效果试验研究灰分：通过减少干燥这四个系列的实验，阐明了细度的影响、含水量对干燥收缩的影响、质量改善效果以及浇筑时对固结新拌混凝土的粘结强度的影响。（6）混凝土高温劣化的试验研究使用粉煤灰：明确了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实验研究：在II类替代率15%时，对I类、II类、III类普通反应骨料的抑制作用较小。