Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/15933
標題: 以超音波法評估混凝土之不同齡期強度
Estimate of Concrete Strength at Various Ages Using the Ultrasounic Pluse Velocity
作者: 李承遠
Lee, Cheng-yuen
關鍵字: Ultrasounic Pluse Velocity
超音波速
early age
Concrete
Strength
早齡期
混凝土
強度
出版社: 土木工程學系所
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Carino, “Setting Time and Strength of Concrete Using the Impact-Echo Method”, ACI Materials Journal, 1988; Vol.85, No.5, pp.389-399. 51. H. W. Chung and K.S. Law, “Diagnosing in Situ Concrete by Ultrasonic Pulse Technique”, Concrete International, Vol.13, No.10,1983, pp.42-49. 52. F. Sellect Scott, N. Landis Eric, L. Peterson Michael, P. Shah Surendra and D. Achenbach Jan, “Ultrasonic Investigation of Concrete with Distributed Damage”, ACI Materials Journal, Vol.95, No.1, January-February 1998, pp.27-36. 53. Wimal Suaris and Viraj Fernando, “Ultrasonic Pulse Attenuation as a Measure of Damage Growth during Cyclic Loading of Concrete”, ACI Materials Journal, May-June 1987, Vol.84, pp.185-193. 54. T.T. Wu and T. F. Lin, “The Stress Effect on the Ultrasonic Velocity Variation of Concrete under Repeated Loading”, ACI Materials Journal, Vol.95, No.5, September-October 1998, pp.519-524. 55. Andersen Johannes and Nerenst Poul, “ Wave Velocity in Concrete”, Journal of ACI, Vol.48, No.8, April 1952,pp.613-636. 56. R. Jones, “Testing of Concrete by an Ultrasonic Pulse Technique”, RILEM Int. Symp. On Nondestructive Testing of Materials and Structures, Paris. Vol.1, Paper No.A-17, January 1954, pp.137, RILEM Bull. No.19, 2nd part, November 1954. 57. M.F. Kaplan, “Effects of Incomplete Consolidation on Compressive and Flexural Strength, Ultrasonic Pulse Velocity, and Dynamic Modulus of Elasticity of Concrete”, Journal of ACI, Vol.56, No.9, March 1952, pp.853-867. 58. Sandor Popovics, “A Hypothesis Concrete the Effects of Macro-Porosity on Mechanical Properties of Concrete”, Fracture of Concrete and Rock, SEM-RILEM International Conference, June 1987,Houston Texas, pp.170-174. 59. ASTM C 597 (1992), "Standard Test Method for Pulse Velocity Through Concrete," Annual Book of ASTM Standards, Vol. 04.02. 60. ASTM C 1383 (1998). "Standard Test Method for Measuring the P-Wave Speed and the Thickness of Concrete Plates Using the Impact-Echo Method" Annual Book of ASTM Standards, Vol. 04.02., 1998. 61. Malhotra, V.M., /Editor et al. (1984).“In Situ/Nondestructive Testing of Concrete”, ACI SP-82, 1984. 62.Komloš, K., Popovics, S., Nürnbergerová, T., Babál, B. and Popovics, J.S. (1996).〝Ultrasonic Pulse Velocity Test of Concrete Properties as Specified in Various Standards,〞Cement and Concrete Composites Volume: 18, June, 1996, pp. 357-364.
摘要: 本研究之目的探討混凝土於早齡期之波速與強度成長率關係,首先將既有資料之波速與強度(水泥糊體量36%,不同水灰比:w/c=0.3、0.4、0.5、0.6、0.7,其砂率有三種30、45、60%,齡期為1、3、7、9、14及28天),轉換成波速與強度成長率,並建立其波速與強度成長率關係曲線,之後規劃試體驗證其迴歸曲線是否適用不同水泥糊體量及不同砂率,驗證混凝土配比為不同水泥糊體量36%與42%,不同水灰比:w/c=0.4、0.5、0.6、0.7,固定砂率40%,製作混凝土圓柱試體,分別在齡期1、4、7、9、14、28天時對圓柱試體量量測波速(超音波法與敲擊回音法)與抗壓強度。 實驗結果顯示,水泥糊體量36%在各水灰比(0.4~0.7),用其波速成長率評估強度,可得良好結果,除齡期第一天波速成長率未達資料所建立迴歸曲線範圍內,大部份預測強度與實測強度差異皆低於±10%以內,而水泥糊體量42%在各水灰比(0.4~0.7),其波速成長率評估強度會有較大變異性,由此可知,不同的水泥糊體量將會影響迴歸方程式之適用性,值得做進一步之探討。 另外,在同齡期下相同試體,其敲擊回音法之波速明顯小於超音波法之波速,且兩者之間並無明顯關係,導致敲擊回音法之波速成長率使用超音波波速與強度成長率關係曲線會造成相當大的誤差,故另建立IE-V與強度成長率關係曲線,其中每個資料點與迴歸曲線變異性不大,顯示所建立之模擬曲線方程式可適用於敲擊回音法之波速評估早齡期混凝土強度。
The purpose of this thesis is to discuss the relationship between the wave velocity and the compressive strength growth rates of concrete at various ages. At the start, the relationship between the ultrasonic pulse velocity (UPV) and the compressive strength growth rates is established based on the previous test data. All the tested specimens had a constant cement paste volume ratio (Vpaste) of 36%. The variables in mixture proportion of the tested specimens included five water-cement ratios of 0.3, 0.4, 0.5, 0.6, and 0.7 and three volume ratios of fine aggregate to total aggregate (30%, 45%, and 60%). Those specimens were tested at 1, 3, 7, 14 and 28 days. The experimental data were used to establish the relationship curve between the UPV and the compressive strength growth rates. Subsequently, verification program is carried out to investigate if the established relationship is suitable for other concrete specimens with different mixture proportions. The specimens were made of concrete with cement paste volume ratios of 36% and 42%, the constituents of the specimens varied in different water/cement ratios (w/c=0.4, 0.5, 0.6 and 0.7). The volume ratio of fine aggregate to total aggregate was 40%. These specimens were tested at 1, 4, 7, 14 and 28 days. For each test, the UPV and impact-echo velocity (IEV) were measured before compressive test. Experimental results show that the most individual difference between the estimated strength by UPV and the measured strength of concrete are less than 10%. It has been verified that the established relationship curve is suitable for concrete having different mixture proportions with same cement paste content (Vpaste=36%). However, the estimate of concrete strength by UPV of the cement paste is 42% has greater variation than cement paste is 36%. Therefore, the effect of cement paste on the relationship between the wave velocity and the compressive strength growth rates of concrete at various ages should be considered in future research. In addition, IEV is smaller than UPV of the same specimen at same age and between both is not related obviously. As a result, there is a need to establish its own relationship between IE-V and the compressive strength growth rates. A small difference between each experimental data and the best-fit curve of the IEV-strength growth rate relationship is found. The use of the measured IEV to predict compressive strength of concrete is suitable.
URI: http://hdl.handle.net/11455/15933
其他識別: U0005-0508200916112500
文章連結: http://www.airitilibrary.com/Publication/alDetailedMesh1?DocID=U0005-0508200916112500
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