以拉拔法評估混凝土品質之試驗與研究

Test and Study for Pullout Test Method Estimating Concrete Quality.

陳怡豪(Yi-Hao Chen)

指導教授 ： 彭添富

國立臺北科技大學/工程學院/土木與防災研究所/碩士(2005年)

https://doi.org/10.6841/NTUT.2005.00283

摘要

混凝土材料於現今營造工程中，仍舊是扮演著非常重要的角色。不論是在主要結構或者次要結構方面，混凝土的使用動輒就是數十方甚或數百方的計量，在這數量大且變異性複雜的複合材料當中，混凝土的品質優劣會直接影響結構物的安全。然而強度是混凝土品質的直接參考指標，經由強度的大小即可知道混凝土是否有發揮其應有的效能。
本研究利用拉拔法來評估混凝土強度，此法屬於非破壞檢測法的其中一種。藉由此法可以找出混凝土抗壓強度與拉拔強度間之關係，並記錄其物理量值，再建立兩者間的關係曲線。曲線的建立，即可有效預測混凝土是否有達到既定強度。
此種非破壞檢測方法在國內並不常見，但是仍有推廣之必要。因其試驗結果出來後發現，藉版試體最大拉拔力算得之拉拔強度與圓柱試體抗壓強度間兩者關係甚為密切，且相較於其他非破壞檢測儀器，拉拔試驗儀的費用較為低廉，而拉拔頭的安裝、儀器的操作、結果的精確都能發揮良好的表現，因此此種檢測技術實待推廣，相信其可以對工程之品質作更好的管控。

關鍵字

拉拔法 ； 拉拔強度 ； 混凝土抗壓強度

並列摘要

The concrete material is used in the construction projects now, and is still playing a very important role. No matter it is in main structures or secondary structures, the usage of the concrete count is much steres. The material is used in big quantity and its variability is complex, it will influence the security of the structures directly whether the quality of the concrete is good or bad. And the strength is a reference index of the concrete quality, we can know whether the concrete perform its efficiency or not via the number of strength.
This research utilizes the pullout test method to assess the intensity of concrete. This method is one kind of non-destructive test methods. To use this method, we can find out the relationship between the strength of the concrete and the pullout strength. After record its physical values, we establish the relation curve between the two values. When the curve was set up, we can predict effectively whether the concrete reach the set intensity.
This method of non-destructive test methods is not common in our country, but it is still necessity to be popularized. Because we discover the relationship between the pullout strength that was calculated from the maximum pullout force and the strength of cylinder specimen is greatest while getting the results. The machine of the pullout test method is cheaper than machines of other non-destructive test methods, and the method can present the accurate results. So this kind of detection technique waits to popularize in fact, it is believed that it can make better quality in construction projects.

並列關鍵字

pullout test method ； pullout strength ； strength of the concrete

參考文獻

【2】 ASTM C 900(1982),“ Standard Test Method for Pullout Strength of Hardened Concrete”, Annual Book of ASTM Standards, Vol.04.02., pp.582-585.

【4】 ACI Committee 228 Report(1995),“ In-Place Methods to Estimate Concrete Strength”, ACI 228.1R-95.

【5】 ACI Committee 214 Report(1996),“ Simplified Version of the Recommended Practice for Evaluation of Strength Test Results of Concrete”, ACI 214.3R-88.

【7】 Hellier, A.K., Sansalone, M., Carino, N.J., Stone, W.C., and Ingraffea, A.R.(1987),” Finite-element analysis of the pullout test using a nonlinear discrete cracking approach”, ASTM J. Cement, Concr. Aggregates, Vol.9, No.1, pp.20-29.

【10】 Krenchel, H. and Shah, S.P.(1985),“ Fracture analysis of the pullout test,” Materials and Structures(RILEM), Vol.18, No.108, pp.439.