飛灰含量對高流動鹼激發爐石基聚合物混凝土工程性質之影響

EFFECTS OF FLY ASH CONTENT ON THE ENGINEERING PROPERTIES OF HIGH-FLOWABILTY ALKALI-ACTIVATED SLAG-BASED CEMENTITIOUS CONCRETE

張大鵬(Ta-Peng Chang) ； 黃俊傑(Jyun-Jie Huang) ； 楊宗叡(Tzong-Ruey Yang) ； 施正元(Jeng-Ywan Shih)

《中國土木水利工程學刊》 34卷1期 (2022/03) Pp. 63-72

https://doi.org/10.6652/JoCICHE.202203_34(1).0007

摘要

本研究探討F級飛灰四種不同含量對鹼激發爐石基聚合物混凝土工程性質之影響，其他試驗參數包括三種鹼激發量、二種矽鈉比及五個齡期，試驗結果顯示：（1）新拌混凝土平均坍度約251 mm，平均坍流度約519 mm，平均初凝時間約602分鐘，平均終凝時間約642分鐘，坍度及坍流度均隨飛灰含量增加而減少，但凝結時間則隨飛灰含量增加而增加，當飛灰取代量比例增加為50%時，坍度及坍流度最大降低率分別為9.80%及23.64%，最大平均初終凝延長率可分別達16.14%及20.90%。（2）混凝土28天齡期平均抗壓強度為31.11 MPa，飛灰含量50%時，最大降低比率可達39.15%。（3）飛灰含量增加時，混凝土吸水率些微增加，但長度乾縮量則明顯增加。

關鍵字

鹼激發聚合物混凝土 ； 飛灰含量 ； 坍度 ； 坍流度 ； 凝結時間 ； 抗壓強度

並列摘要

This study explored the effects of four different contents of Class F fly ash on the engineering alkali activated slag-based geopolymer concrete. Other experimental parameters include three amounts of alkali activator, two kinds of silica-sodium ratio and five ages. Experimental results showed that: (1) The average slump of about 251 mm, average slump flow of about 519 mm, average initial setting time of about 602 min and average final setting time of about 642 min for fresh concrete. The slump and slump flow decreased with the increase of high contents of fly ash, but setting times increased with the increase of fly ash. When the content of fly ash was increased up to 50%, the highest drop ratios of slump and slump flow were 9.80% and 23.64%, respectively, and the highest extended ratio of initial and final setting times were 16.14% and 20.90%, respectively; (2) The average 28-day compressive strength of concrete was 31.11 MPa. At the fly ash content of 50%, the highest drop ratio could reach 39.15; (3) With the increase of fly ash contents, the water absorption rate was slightly increased, but the drying shrinkage ratio was apparently increased.

並列關鍵字

slag-based geopolymer concrete ； fly ash content ； slump ； slump flow ； setting times ； compressive strength

參考文獻

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