本文使用石門水庫淤泥再生輕質粒料取代常重粗粒料，以坍流度試驗、V型漏斗法及U箱型法檢驗自充填輕質混凝土(SCLC)新拌性質，以動彈（剪）性模數、動波松比、超音波速及熱傳導係數等非破壞性試驗量測其硬固性質，並進行三個齡期之圓柱試體抗壓試驗；最後以量測不確定度數學模式進行分析評估，以了解SCLC替代自充填混凝土(SCC)可行性，以及品質穩定度與試驗結果信賴度。
試驗變數包括在單一水膠比(W/B=0.35)情況，使用常重粒料及比重分別為1.1 (SG11)，1.3 (SG13)及1.6(SG16)等三種水庫淤泥再生輕質粒料；以及在比重1.3之輕質粒料條件，使用三種水膠比(W/B = 0.32, 0.33, 0.34)。
根據混凝土試體抗壓強度試驗結果之不確定因素來源可分為常態分配與矩形平均分配兩類，當W/B = 0.35時，混凝土28天抗壓強度在信心水準95.44 % (兩個標準差)的範圍分別為383~417 kgf/cm2 (SG11)、419~463 kgf/cm2(SG13)、459~497 kgf/cm2 (SG16)及485~507 kgf/cm2 (NC)，顯示常重粒料SCC具有較高的信賴度。
所有試驗結果顯示SCLC早期抗壓強度發展趨勢優於SCC，7天抗壓強度達344~396 (kgf/cm2)為28天抗壓強度68~71 %。另外，U型箱試驗期充填高度BH達330 mm以上；V型漏斗流下速度(Vm)試驗顯示SCLC較為緩慢約為SCC的70 %，其中SP添加量高者Vm相對提高；SCLC熱傳導係數在1.05~1.31（W/mK）間，約為SCC熱傳導係數的60%，因此，除了流動速度較慢外，SCLC大部份的其餘材料特性均優於SCC。

關鍵字：輕質粒料、V型漏斗法、U箱型法、自充填輕質混凝土(SCLC)、信心水準、不確定因素。

The locally regenerated lightweight aggregates made from silts taken from domestic Shimen reservoir in Taiwan were used as substitutes for normal weight aggregates used in SCC with different mixture designs in this study. To evaluate the plastic properties of the fresh lightweight concrete(SCLC), the slump-flow test、V-Funnel and U-Box method(to measure the passing ability of SCLC in congested reinforcement or other obstruction)were employed. For the evaluation of the hardened SCLC, the non-destructive test methods used in this paper follows the procedures specified in ASTM, and thus dynamic modulus of elasticity, Poisson’s ratio, and thermal conductivity were measured. The Ultrasonic Pulse Velocity Method (UPVM) was also conducted on test specimen. The cylinder specimen compressive strength for different curing ages was studied via uncertainty mathematical models and by means of analysis of variance. The reliability appraisals for the test results were also studied to assess the quality stability of SCLC in order to evaluate the feasibilities of using SCLC as a substitute for SCC.
Mixture were proportioned with a w/binder ratio of 0.35 for a normal weight SCC, and 3 kinds of SCLC with different densities, i.e., specific gravity S.G. =1.1, S.G.=1.3, and S.G.=1.6 respectively. A series of w/binding materials ratio (w/b=0.32, 0.33 and 0.34respectively) vs compressive strength of SCLC have been also tested for the SCLC specimen with S.G. =1.3 lightweight aggregates.
Based on the tests conducted, and by means of the statistical analysis of normal/average distribution, it was found that under the confidence standard of 95.44%(with 2σ deviation), the compressive strength for an age of 28days are as follows respectively:383~417kgf/cm2 for (SG1.1), 419~463 kgf/cm2 for (SG1.3), 459~497 kgf/cm2 for (SG1.6), and 485~507 kgf/cm2 for normal weight concrete (NC), revealing that the degree of reliability for SCC is high than that of SCLC.
The test results revealed that the early time compressive strength of SCLC surpassed that of SCC. For an age of 7 days, compressive strength of SCLC was as high as 344~396 kgf/cm2, being approximately equal to 68~71% of that of an age of 28 days. Moreover, test results of U-box flowing test showed that the backfill height (BH) reached as high as 330 mm or more. Test results from V-Funnel method revealed that the flowing speed of SCLC was slower than that of SCC, among which Vm value increased as super-plasticizer (SP) dosage increased. The thermal conductivity of the SCLC ranges from 1.07 to 1.31(W/m K) and is only about 60% of SCC. Most of the material properties of SCLC are better than those of SCC except that the flowing speed of the former is slower for SCLC.
Key words: lightweight aggregates, Self-Compacting Concrete, SCLC, confidence standard.

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