Factorial Design of Cement Slurries Containing Limestone Powder for Self-Consolidating Slurry-Infiltrated Fiber Concrete

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Title: Factorial Design of Cement Slurries Containing Limestone Powder for Self-Consolidating Slurry-Infiltrated Fiber Concrete

Author(s): Mohammed Sonebi, Lucie Svermova, and Peter J. M. Bartos

Publication: Materials Journal

Volume: 101

Issue: 2

Appears on pages(s): 136-145

Keywords: concrete; slump test; slurry.

DOI: 10.14359/13054

Date: 3/1/2004

Abstract:
Slurries with high penetrability for production of self-consolidating slurry-infiltrated fiber concrete (SIFCON) were investigated in this study. Factorial experimental design was adopted in this investigation to assess the combined effects of five independent variables on mini-slump test, plate cohesion meter, induced bleeding test, J-fiber penetration test, and compressive strength at 7 and 28 days. The independent variables investigated were the proportions of limestone powder (LSP) and sand, the dosages of high-range water-reducing admixture [superplasticizer (SP)] and viscosity agent (VA), and water-binder ratio (w/ b). A two-level fractional factorial statistical method was used to model the influence of key parameters on properties affecting the behavior of fresh cement slurry and compressive strength. The models are valid for mixtures with 10 to 50% LSP as replacement of cement, 0.02 to 0.06% VA by mass of cement, 0.6 to 1.2% SP, and 50 to 150% sand (percent mass of binder) and 0.42 to 0.48 w/b. The influences of LSP, SP, VA, sand, and w/ b were characterized and analyzed using polynomial regression, which identifies the primary factors and their interactions on the measured properties. Mathematical polynomials were developed for mini-slump, plate cohesion meter, J-fiber penetration test, induced bleeding, and compressive strength as functions of LSP, SP, VA, sand, and w/ b. The estimated results of mini-slump, induced bleeding test, and compressive strength from the derived models are compared with results obtained from previously proposed models that were developed for cement paste. The proposed response models of the self-consolidating SIFCON offer useful information regarding the mixture optimization to secure a high penetration of slurry with low compressive strength.


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