- 學位論文
淤積土砂之現地拌合配比研究-以瓦魯斯溪為例
Study on Mixing Ratio of Sediment Depostion in Situ-A Case Study of Varus Creek
摘要
本研究以屏東縣來義鄉瓦魯斯溪集水區(東部落)為例並參考前人相關之研究報告，採取不區分粗、細骨材之配比乃以1：6、1：9及1：12之配比進行現地拌合試驗，材料之拌合用量比例，則採用重量比法進行計算，現地拌合水量，乃根據蒐集之相關文獻建議，將水灰比設定在0.42~0.55之間，避免現拌時用水量過多而產生析離及用水量過低導致試體收縮過度破壞。 另一方面為瞭解砂石比例變化對拌合試體強度之影響，進行室內之拌合試驗且為減少水泥用量對強度之增減效益，故擇定水泥用量配比為1：9進行室內拌合配比之用量計算，且根據相關文獻研究成果顯示，天然礫石及砂之含量，最高均約為70％，因此本計畫乃設定拌合之礫石與砂之比例分別為30/70、50/50及70/30，作為後續成果之檢討比對。 拌合粒料之含泥量對拌合體強度之影響程度亦為考量之重點，因此室內拌合採配比1：9進行試驗實乃以現地礫石與砂比例為70/30之配比進行拌合，且含泥量則分別為細骨材含量之0％、3％及5％，作為後續強度成果之檢討。 綜合觀測資料與分析結果歸納成果如下： 1.採樣孔粒徑調查結果顯示，自上游往下游之粒徑曲線漸趨於平滑，且粒徑停留百分比有「大粒徑減少而小粒徑增加之趨勢」。 2.瓦魯斯溪集水區(東部落)的含土量為29.94％、FM為7.03、含水量為1.86％、比重為2.11％，而參考經濟部中央地質調查所出版之台灣地區陸上砂石資料調查與研究報告，瓦魯斯溪級配為良好礫石。 3.含泥量0％之7天初期強度會略大於含泥量3％及5％。 4.在28天抗壓強度時可明顯看出，5%的含泥量小於0%含泥量。 5.在強度增長比值上，含泥量0％大於含泥量3%及5%，顯示出含泥量對於強度增長及強度要求方面影響甚鉅。 6.含泥量(0％、3％、5％及7%)之28天平均抗壓強度會隨含泥量增加而下降，因此可以確定含泥量對抗壓強度的減損是高度相關的，而未來在現地工程施作時，應對含泥量所造成的減損進行預防措施，以確保施作品質控管及澆置時間控制，避免材料乾縮影響膠結。 7.瓦魯斯溪集水區(東部落)淤積土砂現地拌合各配比之抗壓強度隨灰固比增加而增加，且具有線性關係y=794.77x+6.4243。，而線性迴歸之相關係數R2為0.9987屬高度相關性，因此淤積土砂現地拌合配比之最大影響因子為灰固比。 8.各配比現地拌合之單價分別為1,223元、902元及723元，約為預拌混凝土單價之55％~70％左右，且若運距增加則現地拌合之單價優勢越高。
並列摘要
In the study according to the reference, the mixing ratio to used non-sieve fine and coarse aggregate (the ratio of 1:6,1:9,1:12).The used quantity of cement and aggregate was design by weight method. The test-2 is control the coarse aggregate ratio to three group,the coarse aggregate ratio are 30 percent,50 percent,and 70 percent.The test-3 is control the mud content ratio to four group,the mud content ratio are 0 percent, 3 percent, 5 percent,and 10 percent. The water-cement ratio was design between 0.42~0.55. This paper is now in order to understand the relation between strength of the ratio of on-situ mixing, Some results from the research are as follow: 1.The particle size of the sampling hole survey, from upstream to downstream of the particle size curve gradually becomes smooth, and the particle size stays the percentage of large particle size reduction and the increasing trend of small particle size. 2.Soil amount to 29.94%, FM 7.03, the moisture content of 1.86%, accounting for 2.11% in Varus Creek (tribes of the east)containing while the reference the the Taiwan onshore gravel data survey published by the Ministry of economic affairs, the central geological Survey study, tuvalu the adams creek graded as good gravel. 3.The mud content 0% 7 days early strength will be slightly larger than the clay content of 3% and 5%, respectively. 4.28 day compressive strength is evident less than 0%, 5% clay content clay content. 5.Mud content of 0% on the strength of growth in the ratio of more than 3% and 5% clay content, clay content shows the strength of the growth and strength requirements is greatly influenced. 6.With clay content (0%, 3%, 5% and 7%) of the 28-day average compressive strength decreased with increasing clay content, so you can determine clay content on the compressive strength of the derogation is highly relevant, andfuture respond to the impairment caused by the clay content in situ engineering facilities for precautionary measures, to ensure that the facilities works quality control tube and pouring control to avoid material drying shrinkage affect cementation. 7.Varus creek(tribes of the east) silt sediment now mixing ratio of compressive strength with gray solid ratio increases, and has a linear relationship y = 794.77x +6.4243. Linear regression correlation coefficient R2 = 0.9987 are highly correlated, therefore silt sediment now mixing ratio of the maximum impact factor gray solid ratio. 8.The ratio now mixing unit price of 1,223 yuan, 902 yuan and 723 yuan, which is about ready-mix concrete unit price 55% to 70%, and if the transport distance increased now to mixing of the higher unit price advantage.