水災淤泥應用於控制性低強度材料之可行性研究

Study on the Feasibility of the Controlled Low Strength Material from Flood Sludge

胡家珩(Jie-Heng Hu)

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(2010年)

https://doi.org/10.6346/NPUST.2010.00142

摘要

本文針對台灣2009年88水災淤泥應用於控制性低強度材料（Controlled Low Strength Materials, CLSM）之可行性進行研究。先提出一CLSM配比設計的程序，在固定水灰比W/C=1.8下，取水泥量 C=180、210、240 kg三組試樣，每組水災淤泥佔淤泥加細骨材總量的百分比K=0、25、50、75、100 %分5種試樣。每種試樣皆作含氣量、單位重、管流度、凝結時間、抗壓強度等試驗。前二項試驗作為修正配比設計之參考，後三項試驗乃用於評估各試樣作CLSM之可行性。
試驗結果顯示，淤泥佔量K越大，則含氣量A及凝結時間越大，單位重U和管流度越小。除了C=210 kg、K=0 %及C=240 kg、K=0 %之配比試樣因骨材析離而抗壓強度下降外，其餘試樣皆顯示淤泥佔量K越大，抗壓強度F越小。C=210 kg、K=100%之配比試樣可滿足行政院公共工程委員會對管溝回填的管流度15~20 cm、凝結時間小於12小時、28天抗壓強度F=20~50 kgf/cm2之要求；另者，C=180 kg、K=50%和C=210 kg、K=75%之配比試樣可滿足管流度20~30 cm之要求。因此，若從淤泥取代量來考量，需一般流動性者，以C=210 kg、K =100%為最佳配比；需高流動性者，以C=210 kg、K=75%為最佳配比。

關鍵字

水災淤泥 ； 控制性低強度材料 ； 管流度

並列摘要

The paper studied on the feasibility of the flood sludge from the 88 water disaster occurred in Taiwan in 2009 being used as a controlled low strength materials (CLSM). Firstly, a CLSM mix design procedure was proposed with fixed water/cement ratio W/C=1.8, three sample sets with cement amount C=180, 210, 240 kg were chosen. In each set, 5 samples were made by replacing 0%, 25%, 50%, 75%, 100% aggregate by flood sludge. Each sample was then performed the tests of unit weight, air content, flow consistency, setting time and compressive strength. The former two tests were used to revise the mix design, the latter three tests were used for evaluating the feasibility of each mix sample used as a CLSM.
The test results showed that, when the flood sludge replacement K was larger, the air content and setting time became larger, but the unit weight and flow consistency became smaller. Except the mix samples of C=210 kg with K=0% and C=240 kg with K=0%, in which aggregate segregation occurred, compressive strength became smaller. The mix sample of C=210 kg with K=100% could satisfy the requirements of 15~20 cm flow consistency, setting time less than 12 hours, and 20~50 kgf/cm² 28-day compressive strength, which were proposed by the Public Construction Commission of Executive Yuan for pipe and trench re-filling. In addition, the mix samples of C=180 kg with K=50% and C=210 kg with K=75% could satisfy the requirement of 20~30 cm flow consistency. Therefore, the best sample was C=210 kg with K=100% for normal flowing replacement, and C=210 kg with K=75% for high flowing replacement when the replacement amount of sludge was considered.

並列關鍵字

flood sludge ； flow consistency ； controlled low strength materials ； CLSM

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