低水泥量氣冷高爐石透水混凝土之研究

Study on Air-cooled Blast Furnace Slag Used for Pervious Concrete of Low Cement Amount

林群軒(Cyun-Syuan Lin)

指導教授 ： 吳志興

國立屏東科技大學/工學院/土木工程系所/碩士(2015年)

https://doi.org/10.6346/NPUST.2015.00018

摘要

本文以中鋼公司之氣冷高爐石作為透水混凝土骨材，添加強笙公司之無機離子固化劑，製作水灰比W/C=0.62~0.76之透水混凝土試體。骨材粒徑為 4.75~19.0 mm，配比之水泥用量C為150 kg。搗實工具為長條型鋼棒，底部為直徑5 cm、厚度2 cm之圓型鋼板及底部為5#westeur024#5 cm、厚度2 cm之方型鋼板二種搗實工具，分別用於圓柱試體及梁試體，並以相同的搗實程度製作試體，施作抗壓強度、抗彎強度、透水係數及孔隙率等試驗，以尋求滿足透水性、保水性需求之最大混凝土強度之水灰比W/C。
試驗結果顯示，28天的最大強度之水灰比為W/C=0.72之配比，其抗壓強度fc和破裂模數R值各為41.3 kgf/cm2和16.3 kgf/cm2。相較於C＝350 kg之171 kgf/cm2和41.1 kgf/cm2，強度為其0.24和0.40倍。該配比之水泥用量為167 kg、用水量為75.2 kg、固化劑為1.7 kg、骨材用量為1484 kg。7天對28天抗壓強度比fc7/fc28在0.63~1.09之間，平均為0.87；7天對28天破裂模數比R7/R28在0.63~1.23之間，平均為0.99，皆高於一般常重混凝土的0.70與C＝350 kg之0.85和0.92。28天之破裂模數對抗壓強度比R28/fc28在0.26~0.40之間，平均為0.31，高於一般常重混凝土的0.15或C＝350 kg之0.22。28天透水係數k值皆大於2.3 cm/sec，遠超過臺灣建築中心建議透水性之基準值0.01 cm/sec。28天孔隙率n值在37%~45%之間，亦皆大於基準值15%。
本試驗之C＝150 kg氣冷高爐石透水混凝土強度fc＝41.3 kgf/cm2、R＝16.3 kgf/cm2，於深度6 cm之載重層可符合臺灣建築中心評定基準之B級鋪面強度要求；於深度10 cm可符合A級之要求。

關鍵字

透水混凝土 ； 氣冷高爐石 ； 透水係數 ； 孔隙率 ； 抗壓強度

並列摘要

The thesis used the air-cooled blast furnace (ABF) slag by China Steel Corporation (CSC) as aggregate and added the inorganic ion curing agent by Johnson Corporation in the making of pervious concrete. The water-cement ratios W/C of pervious concrete specimens ranged from 0.62 to 0.76. Aggregate particle size was between 4.75~19.0 mm. Cement amount C in the mix is 150 kg. Tamping tools were two steel rods, one with 5 cm diameter round bottom, 2 cm thickness, and the other with 5#westeur024#5 cm square bottom, 2 cm thickness, were used to impact cylindrical and beam specimens respectively. The specimens were made by the same degree of impacting, and were performed the compressive strength, flexural strength, permeability coefficient, and porosity tests. The purpose of the tests is to find the W/C of maximum strength for the concrete, which also have to meet the permeability and water retention requirements.
Test results showed that, both the W/C of the maximum strength of 28 day concrete were 0.72. The values of the compressive strength fc and modulus of rupture R were 41.3 kgf/cm2 and 16.3 kgf/cm2 respectively. Compared with the values 171 kgf/cm2 and R=41.1 kgf/cm2 of C=350 kg, the strengths were its 0.24 and 0.4 time. The mix for this specific W/C was 167 kg cement, 75.2 kg water, 1.7 kg curing agent and 1484 kg slag aggregate. The ratio of the 7 day to 28 day compressive strength fc7/fc28 were between 0.63~1.09, averaged at 0.87. The ratio of modulus of rupture Rc7/Rc28 were between 0.63~1.23, averaged at 0.99, higher than 0.70 of normal concrete or 0.85 and 0.92 of C=350 kg concrete. The ratio of the 28 day compressive strength to modulus of rupture R/fc were between 0.26~0.40, averaged at 0.31, higher than 0.15 of normal concrete or 0.22 of C=350 kg concrete. All the permeability coefficient k values exceeded 2.3 cm/sec, far beyond the criteria value 0.01 cm/sec proposed by Taiwan Architecture and Building Center. The porosity n values ranged between 37%~45%, were also larger than the criteria value 15%.
The strengths fc＝41.3 kgf/cm2 and R＝16.3 kgf/cm2 of the tested C=150kg ABF slag previous concrete can be used in class B pavement proposed by Taiwan Architecture and Building Center for load layer of 6 cm depth, and can be used in class A pavement for load layer of 10 cm depth.

並列關鍵字

pervious concrete ； air-cooled blast furnace slag ； permeability coefficient ； porosity ； compressive strength

參考文獻

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