Relationship Between Paste Volume and Cementitious Materials Content in Hardened Concrete

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Volume 3, Issue 4 (April 2006)

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ISSN: 1546-962X
Page Count: 9

Relationship Between Paste Volume and Cementitious Materials Content in Hardened Concrete
Cong, DX
Senior Petrographer, Wiss, Janney, Elstner Associates, Inc., Texas

(Received 3 December 2004; accepted 10 November 2005)

Abstract

A linear regression equation is developed between the paste volumes via the point count method and total cementitious materials contents of 31 concrete samples with known mix proportions. The equation has a coefficient of determination (R²) of 0.96 and a standard deviation of 13.6 kg/m³. The equation can be used to calculate the total cementitious materials content based on the paste volume measured via point count and the water-to-cementitious-materials ratio estimated petrographically, and the result is more accurate than the traditional method currently used by many concrete petrographers. The equation is equally effective for portland cement concrete and concrete containing fly ash. In addition, the effect of fly ash, and the traditional method for estimating the cementitious materials content are further discussed.

Keywords:
cementitious materials content, fly ash, paste volume, point count, regression

Paper ID: JAI13057
DOI: 10.1520/JAI13057
ASTM International is a member of CrossRef.

Author Title Relationship Between Paste Volume and Cementitious Materials Content in Hardened Concrete Symposium Petrographic Techniques for Examining Hydraulic Cements and Concretes, 2004-12-10 Committee C09

		Home Journals STPs Manuals Topics Subscriptions/Pricing Digital Library / Journals / Journal of ASTM International (JAI) / Citation Page Volume 3, Issue 4 (April 2006) Click here to download this paper now for $25 PDF (208K) View License Agreement ISSN: 1546-962X Page Count: 9 Relationship Between Paste Volume and Cementitious Materials Content in Hardened Concrete Cong, DX Senior Petrographer, Wiss, Janney, Elstner Associates, Inc., Texas (Received 3 December 2004; accepted 10 November 2005) Abstract A linear regression equation is developed between the paste volumes via the point count method and total cementitious materials contents of 31 concrete samples with known mix proportions. The equation has a coefficient of determination (R²) of 0.96 and a standard deviation of 13.6 kg/m³. The equation can be used to calculate the total cementitious materials content based on the paste volume measured via point count and the water-to-cementitious-materials ratio estimated petrographically, and the result is more accurate than the traditional method currently used by many concrete petrographers. The equation is equally effective for portland cement concrete and concrete containing fly ash. In addition, the effect of fly ash, and the traditional method for estimating the cementitious materials content are further discussed. Keywords: cementitious materials content, fly ash, paste volume, point count, regression Paper ID: JAI13057 DOI: 10.1520/JAI13057 ASTM International is a member of CrossRef. Author Title Relationship Between Paste Volume and Cementitious Materials Content in Hardened Concrete Symposium Petrographic Techniques for Examining Hydraulic Cements and Concretes, 2004-12-10 Committee C09