- 期刊
知本溪樂林橋段淤積土砂現地拌合配比之研究
A Study on Mixing Ratio of Sediment Deposition in Situ at Leling Bridge Section of Chihpen River
摘要
本研究以知本溪樂林橋段淤積土砂為例，參考前人研究成果採用不區分粗細骨材的配比1：6、1：9及1：12進行拌合試驗。在材料之用量上，則採用重量比法進行計算；而拌合水量方面，將水灰比設定在0.42~0.55之間。另為瞭解砂石比例變化對拌合體強度之影響，且為減少水泥用量對 強度之增減效益，因此擇定水泥用量適中的配比1：9進行拌合配比之用量計算，又根據前人研究成果，天然礫石及砂之含量，最高均約為70％，因此規劃拌合之石、砂比例分別為30/70、50/50及70/30。綜合觀測資料與分析結果，拌合時漿體稠度隨著含砂量增加而增加，且當含砂量達70％時漿體流動性已幾近消失；含石量較高之配比，則初期強度越高，具有早強特性，而含砂量較高之配比，則需要較長時間，拌合體強度才會表現出來；砂、石比例與抗壓強度之迴歸公式為y=-802.65x^2+880.88x-35.941，相關係數R為0.7367屬中等相關以上。
並列摘要
In the study we accorded to the reference of mixing ratio to used non-sieve fine and coarse gravel (the ratio of 1:6, 1:9, 1:12) for the sediment deposition in situ at Leling bridge section of Chihpen River. The used quantity of cement and gravel was design by weight method. The water-cement ratio was design between 0.42~0.55. The test-2 is control the coarse gravel ratio to three group, the coarse gravel ratio are 30%, 50% and 70%t. Some results from the research are as follow. The consistency of slurry increases with the increase of sand content, and when the sand content reaches 70%, the slurry fluidity has almost disappeared. The higher ratio of gravel content, the initial strength is higher, with early strength characteristics. The higher ratio of sand content, you need a longer time, the strength of the mixture will be demonstrated. The regression formula of the ratio of sand, gravel and compressive strength is y=-802.65x2+880.88x-35.941, and the correlation coefficient R is 0.7367, it above the significant level of statistics.