添加碳酸鈣高壓磚於不同養護環境下硬固性質與白華現象之研究

HARDNESS PROPERTIES AND EFFLORESCENCE APPEARANCE OF ADD CALCIUM CARBONATE HIGH-PRESSURE BRICKS IN DIFFERENT ENVIRONMENTS CURING

王和源(Her-Yung Wang) ； 胡琮淵(Cong-Yuan Hu)

《中國土木水利工程學刊》 32卷4期 (2020/06) Pp. 359-366

https://doi.org/10.6652/JoCICHE.202006_32(4).0007

摘要

本研究以添加淨水軟化碳酸鈣結晶，製成高壓磚，期能有效降低構造物上高壓磚的白華現象。研究顯示，碳酸鈣高壓磚隨著齡期增加時，抗壓強度及超音波波速則會提升。白華量化分析由Painet.net圖像分析及刮除率顯示面層或底層白華面積率與刮除率於硬固混凝土養護條件下皆大於其他養護條件（砂質土壤、棧板、保鮮膜密封及恆溫恆濕箱），且底層白華生成量皆較面層多5.31%～19.82%，SEM分析觀察到許多結晶狀氫氧化鈣膠體，約占水泥體積20%～25%；EDS分析鈣元素佔6.64%，較高於其他元素。且以保鮮膜密封養護方式較能抑制白華結晶生成。

關鍵字

碳酸鈣 ； 高壓磚 ； 養護環境 ； 白華現象

並列摘要

In order to effectively reduce the efflorescence appearance of compressed paving units on structures, this study used clear water to soften calcium carbonate crystallization. The effect of age, environment curing and brick type on the hardness properties and efflorescence appearance was discussed by compressive strength, ultrasonic pulse velocity, Paint.net image analysis and scraping rate test, SEM analysis and EDS analysis. The findings show that the compressive strength and ultrasonic pulse velocity of the add calcium carbonate high-pressure bricks increase with age. The quantitative analysis of efflorescence shows, according to Painet.net image analysis and scraping rate, that the surface or bottom efflorescence area ratio and the scraping rate under the hardened concrete curing condition are larger than that under the other curing conditions, and the bottom efflorescence generation is higher than the surface layer by 5.31% ~ 19.82%. For microscopic analysis, a lot of crystalloid Ca(OH)_2 colloid is observed by SEM analysis, about 20% ~ 25% of cement volume. The EDS analysis validates that the Ca is the main element of efflorescence, accounting for 6.64%, much higher than the other elements. The preservative film sealed curing is more effective on suppressing the efflorescence crystal formation.

並列關鍵字

calcium carbonate ； the general high-pressure bricks ； environment curing ； efflorescence appearance

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