TY - JOUR
T1 - Characterization of multi-scale porosity in cement paste by advanced ultrasonic techniques
AU - Punurai, Wonsiri
AU - Jarzynski, Jacek
AU - Qu, Jianmin
AU - Kim, Jin Yeon
AU - Jacobs, Laurence J.
AU - Kurtis, Kimberly E.
PY - 2007/1
Y1 - 2007/1
N2 - The effectiveness of advanced ultrasonic techniques to quantitatively characterize the capillary porosity and entrained air content in hardened cement paste is examined. Direct measurements of ultrasonic attenuation are used to measure the volume fraction and average size of entrained air voids and to assess variations in intrinsic porosity - as influenced by water-to-cement ratio (w/c) - in hardened cement paste samples. For the air entrained specimens, an inversion procedure based on a theoretical attenuation model is used to predict the average size and volume fraction of entrained air voids in each specimen, producing results in very good agreement with results obtained by standard petrographic methods and by gravimetric analysis. In addition, ultrasonic attenuation measurements are related to w/c to quantify the relationship between increasing porosity (with increasing w/c) and ultrasonic wave characteristics.
AB - The effectiveness of advanced ultrasonic techniques to quantitatively characterize the capillary porosity and entrained air content in hardened cement paste is examined. Direct measurements of ultrasonic attenuation are used to measure the volume fraction and average size of entrained air voids and to assess variations in intrinsic porosity - as influenced by water-to-cement ratio (w/c) - in hardened cement paste samples. For the air entrained specimens, an inversion procedure based on a theoretical attenuation model is used to predict the average size and volume fraction of entrained air voids in each specimen, producing results in very good agreement with results obtained by standard petrographic methods and by gravimetric analysis. In addition, ultrasonic attenuation measurements are related to w/c to quantify the relationship between increasing porosity (with increasing w/c) and ultrasonic wave characteristics.
KW - Admixture (D)
KW - Air entrainment
KW - Microstructure (B)
KW - Modelling (E)
KW - Pore size distribution (B)
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U2 - 10.1016/j.cemconres.2006.09.016
DO - 10.1016/j.cemconres.2006.09.016
M3 - Article
AN - SCOPUS:33751523833
SN - 0008-8846
VL - 37
SP - 38
EP - 46
JO - Cement and Concrete Research
JF - Cement and Concrete Research
IS - 1
ER -