A new method to determine initial setting time of cement and concrete using plate test

The present study developed a new method for determination of cement and concrete setting times. The disadvantage of current methods is that most only determine setting time of either cement or concrete and cannot determine the setting time of all types of concrete and cement, especially those containing mineral admixtures. In the proposed method, a plate with a rough surface is rigidly attached to the bottom of a precision balance in a PVC cylinder and immersed in fresh mixture poured into the side of the cylinder opposite the balance. The shear force exerted on the plate increases over time and the value recorded by the balance increases moment-by-moment. The difference between the sequential weights recorded at specific intervals was maximized at the setting time moment. Three types of cement paste and three types of self-compacting concrete were evaluated using the new method. The initial setting time obtained by this method was confirmed using the results of existing test methods. The results show the feasibility and accuracy of the proposed plate test method to determine initial setting times of cement and concrete.

[1]  Xiaosheng Wei,et al.  Determination of Concrete Setting Time Using Electrical Resistivity Measurement , 2007 .

[2]  William John McCarter,et al.  CHARACTERIZATION AND MONITORING OF CEMENT-BASED SYSTEMS USING INTRINSIC ELECTRICAL PROPERTY MEASUREMENTS , 2003 .

[3]  Sofiane Amziane,et al.  A novel settling and structural build-up measurement method , 2008 .

[4]  F. Tamás Electrical conductivity of cement pastes , 1982 .

[5]  James J. Beaudoin,et al.  On the relationship between porosity and electrical resistivity in cementitious systems , 1996 .

[6]  D. Kee,et al.  NEW METHOD FOR THE DETERMINATION OF YIELD STRESS , 1980 .

[7]  Xiaosheng Wei,et al.  Study on hydration of Portland cement with fly ash using electrical measurement , 2005 .

[8]  C. Mari,et al.  The evolution of cement paste hydration process by impedance spectroscopy , 2001 .

[9]  Parviz Ghoddousi,et al.  Effects of particle packing density on the stability and rheology of self-consolidating concrete containing mineral admixtures , 2014 .

[10]  N. Neithalath,et al.  Monitoring the evolution of material structure in cement pastes and concretes using electrical property measurements , 2013 .

[11]  Yanzhou Peng,et al.  Dense packing properties of mineral admixtures in cementitious material , 2009 .

[12]  Jan Olek,et al.  Characterizing Enhanced Porosity Concrete using electrical impedance to predict acoustic and hydraulic performance , 2006 .

[13]  Daniel De Kee,et al.  A slotted plate device for measuring static yield stress , 2001 .

[14]  I. Topcu,et al.  Electrical conductivity of setting cement paste with different mineral admixtures , 2012 .

[15]  Thomas O. Mason,et al.  Influence of Silica Fume on the Early Hydration of Portland Cements Using Impedance Spectroscopy , 1992 .

[16]  Edward J. Garboczi,et al.  Impedance Spectroscopy of Hydrating Cement‐Based Materials: Measurement, Interpretation, and Application , 1994 .

[17]  N. Neithalath,et al.  Electrical conductivity based characterization of plain and coarse glass powder modified cement pastes , 2007 .

[18]  Ping Gu,et al.  Dielectric behaviour of hardened cementitious materials , 1997 .

[19]  P. Tumidajski Relationship between resistivity, diffusivity and microstructural descriptors for mortars with silica fume , 2005 .

[20]  J. Beaudoin,et al.  Investigation of the retarding effect of superplasticizers on cement hydration by impedance spectroscopy and other methods , 1994 .

[21]  Xiaosheng Wei,et al.  Early hydration of calcium sulfoaluminate cement through electrical resistivity measurement and microstructure investigations , 2011 .

[22]  Sofiane Amziane,et al.  A new look at the measurement of cementitious paste setting by Vicat test , 2010 .

[23]  Lianzhen Xiao,et al.  Early-age hydration of fresh concrete monitored by non-contact electrical resistivity measurement , 2008 .

[24]  Xiaosheng Wei,et al.  Selection of superplasticizer in concrete mix design by measuring the early electrical resistivities of pastes , 2007 .