Yield stress of cement grouts

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Yield stress of cement grouts - DIVA

In this work,measurement of the yield stress of cement grout was performed with different measurement techniques using a conventional rheometer.In addition,in-line measurements using an ultrasound based technique were made in order to visualize the flow profile and perform a direct measurement of the yield stress.Two ranges of yield stress Yield stress of cement grouts - DIVA2017 (English) In Tunnelling and Underground Space Technology,ISSN 0886-7798,E-ISSN 1878-4364,Vol.61,p.50-60 Article in journal (Refereed) Published Abstract [en] The rheology of cement grout is complex due to its thixotropic nature and the presence of a yield stress.Yield stress of cement grout Incipientus Ultrasound Flow Sep 07,2016 Yield stress of cement grouts#0183;Rahman,M.,Wiklund,J.,Kotz Yield stress of cement grouts#233;,R.,H Yield stress of cement grouts#229;kansson,U.(2016).Yield stress of cement grout.Tunnelling and Underground Space Technology 61:50-60 September 2016.

Yield stress for zeolite-cement grouted sand

zeolite-cement grouted sand specimens is less than 1%.Beyond the yield point (YP),a sudden increase in the strain occurs,and the stressstrain curve continues with a slight gradient.Time after mixing (min) Yield stress (Pa) 5 4 10 6 15 8 20 10 6 more rows Oct 8 2020Author:Mashuqur Rahman,Johan Wiklund,Reinhardt Kotz Yield stress of cement grouts#233;,Ulf H Yield stress of cement grouts#229;kanssonCited by:16Publish Year:2017Yield stress of cement grouts - ScienceDirectWas this helpful?Yield stress of cement grouts - ScienceDirectJan 01,2017 Yield stress of cement grouts#0183;4.2.Yield stress determined by stress ramp test.To determine the static and dynamic yield stresses of cement grout,stress ramp tests were used because of their broad applicability for the determination of yield stress (Barnes,1999,Nguyen and Boger,1992).In contrast to the simple yield stress fluid,thixotropic suspensions show an infinite viscosity at an applied stress lower than the Rheology of Natural Hydraulic Lime Grouts for Conservation The static yield stress has already been defined above,while the dynamic yield stress can be seen as the yield stress when the grout is subjected to shear and is in a fully broken down state.Rahman et al.[ 28 ] measured the yield stress of cement-based grout considering the effect of thixotropy and hydration.

Rheology of Natural Hydraulic Lime Grouts for Conservation

The static yield stress has already been defined above,while the dynamic yield stress can be seen as the yield stress when the grout is subjected to shear and is in a fully broken down state.Rahman et al.[ 28 ] measured the yield stress of cement-based grout considering the effect of thixotropy and hydration.Rheological Properties of Cement-Based Grouts Determined The grouts were 1) Talc for fluidity and strength by reacting with cement,2) Palygorskite (attapulgite) for early gelation by being thixotropic,and 3) Powdered quartz for chemical integrity.The freshly prepared grouts behaved as Bingham fluids with viscosities from 0.151 to 0.464 Pas and yield stresses 5.2 Pa to 36.7 Pa.Statistical analysis Rheological Properties of Cement-Based Grouts Determined The grouts were 1) Talc for fluidity and strength by reacting with cement,2) Palygorskite (attapulgite) for early gelation by being thixotropic,and 3) Powdered quartz for chemical integrity.The freshly prepared grouts behaved as Bingham fluids with viscosities from 0.151 to 0.464 Pas and yield stresses 5.2 Pa to 36.7 Pa.Statistical analysis

Research on Time-Varying Behavior of Cement Grouts of

The thesis presents an research on the time-varying behavior of cement grouts with different water-cement ratio of 0.5,0.55,0.6,0.65,0.7,0.75,0.8,0.9,1.0,1.1,1.25,1.0,2.0,5.0 and10.0 at 0 minute,5minutes,10minutes,20minutes,30minutes,60minutes,respectively.This was to investigate the time-varying behavior of reheological parameters of cement grouts with different water-cement ratios.It Related searches for Yield stress of cement groutsdensity of cement groutusing cement as groutcement grout mixturecement grout mixPrevious123456NextIn-line rheology of cement grouts - Feasibility study of Rheological properties of cement grouts were measured by H Yield stress of cement grouts#229;kansson (1993) using different laboratory and field measurement techniques.It was shown that the determined yield stress and viscosity of the grouts used differ significantly depending on the measuring technique.The instruments used in the fieldRelated searches for Yield stress of cement groutsdensity of cement groutusing cement as groutcement grout mixturecement grout mix12345NextYield stress of cement grouts - DIVA2017 (English) In Tunnelling and Underground Space Technology,ISSN 0886-7798,E-ISSN 1878-4364,Vol.61,p.50-60 Article in journal (Refereed) Published Abstract [en] The rheology of cement grout is complex due to its thixotropic nature and the presence of a yield stress.

Related searches for Yield stress of cement grouts

density of cement groutusing cement as groutcement grout mixturecement grout mixPROPERTIES AND PERFORMANCE OF CEMENT-BASED GROUTSGrouts containing selected additives were compares with conventional bentonite and cement grouts.Significant enhancement of grout alumina grit,steel fibers,and silicon carbide increased the thermal conductivity when compared to unfilled,high solids bentonite grouts and conventional cement grouts.PROPERTIES AND PERFORMANCE OF CEMENT-BASED GROUTSGrouts containing selected additives were compares with conventional bentonite and cement grouts.Significant enhancement of grout alumina grit,steel fibers,and silicon carbide increased the thermal conductivity when compared to unfilled,high solids bentonite grouts and conventional cement grouts.

Optimisation of rheological parameters and mechanical

Optimisation of rheological parameters and mechanical properties of superplasticised cement grouts containing metakaolin and viscosity modifying admixture.M plate cohesion,yield stress,and plastic viscosity.Results indicate that the use of MTK increased yield stress,plastic viscosity,cohesion plate,and flow time due to the higher Multi-Blend Cementitious Injection Grouts for Repair and Figure 1Effect of the mixing procedure on the flow curves of Grout 13b-0 Table 4Effect of the mixing procedure on the yield stress [in Pa] of grouts GROUT 13b-0 GROUT 13b-10 TIME[min] HT US HT US 0 3.74 0.84 9.20 6.30 15 4.41 0.99 10.05 6.95 30 5.46 1.14 10.85 7.73 60 8.00 1.58 12.52 9.08 90 10.23 2.27 14.78 10.56 120 13.41 3.01 17.00 12.70 In-line rheology of cement grouts - Feasibility study of Rheological properties of cement grouts were measured by H Yield stress of cement grouts#229;kansson (1993) using different laboratory and field measurement techniques.It was shown that the determined yield stress and viscosity of the grouts used differ significantly depending on the measuring technique.The instruments used in the field

In-line rheology of cement grouts - Feasibility study of

Rheological properties of cement grout such as viscosity and yield stress are commonly measured off-line using laboratory instruments,and some simple tools are available to make field measurements.However,these methods often lack accuracy and reliability.IN-LINE RHEOLOGY OF CEMENT GROUTS FEASIBILITYrelative to other materials,cement based materials are commonly used as grouts and,in this context,the rheology of the cement grout is an important factor.Rheological properties of cement grout such as viscosity and yield stress are commonly measured off-lineIN-LINE RHEOLOGY OF CEMENT GROUTS FEASIBILITYrelative to other materials,cement based materials are commonly used as grouts and,in this context,the rheology of the cement grout is an important factor.Rheological properties of cement grout such as viscosity and yield stress are commonly measured off-line

How to determine concrete yield

receiving more concrete than bargained for,strength will inevitably be affected.When the cement content is kept constant and yield incre a s e s ,the cement factor is,in ef-fect,lowe r ed and the result will be lowe r ed stre n g t h .Co n ve r s e l y ,if aggregates are contaminated with materi-How to determine concrete yieldreceiving more concrete than bargained for,strength will inevitably be affected.When the cement content is kept constant and yield incre a s e s ,the cement factor is,in ef-fect,lowe r ed and the result will be lowe r ed stre n g t h .Co n ve r s e l y ,if aggregates are contaminated with materi-GROUT FOR CONCRETE MASONRY - NCMAThe Effects of Concrete Masonry Unit Moisture Content on Grout Bond and Grout Compressive Strength,MR 11.National Concrete Masonry Association Research and Development Laboratory,1997.Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete,ASTM C618- 03.ASTM International,2003.

GROUT FOR CONCRETE MASONRY - NCMA

The Effects of Concrete Masonry Unit Moisture Content on Grout Bond and Grout Compressive Strength,MR 11.National Concrete Masonry Association Research and Development Laboratory,1997.Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete,ASTM C618- 03.ASTM International,2003.From Mini-Cone Test to Abrams Cone Tests Measurement of This article reports on a type of stoppage test,the mini-cone test,and its use for cement pastes and grouts yield stress measurement.Stoppage tests in civil engineering consist of measuring the shape of a fresh material deposit after flow occurred.The authors first review the Abrams cone test,used for concrete.Estimation of the Yield Stress of Cement Pastes from This study proposes a continuous method for predicting the yield stress development from mixing until the final setting point.Samples prepared with water to cement ratios (w/c) of 0.3,0.35 and 0.4 are tested using a vane in cup rheometer,a Vicat needle and a non contact electrical resistivity machine (NC-ERM).Times corresponding to the initial yield stress (ta),a dramatic increase in the

Estimation of the Yield Stress of Cement Pastes from

This study proposes a continuous method for predicting the yield stress development from mixing until the final setting point.Samples prepared with water to cement ratios (w/c) of 0.3,0.35 and 0.4 are tested using a vane in cup rheometer,a Vicat needle and a non contact electrical resistivity machine (NC-ERM).Times corresponding to the initial yield stress (ta),a dramatic increase in the Estimation of Viscosity and Yield Stress of Cement Grouts yield stress of cement grouts,considering the effect of elevated ground temperature on the rheology of both cement grouts and water.Temperature is controlled between 12 Yield stress of cement grouts#176;C and 45 Yield stress of cement grouts#176;C to simulateEstimation of Viscosity and Yield Stress of Cement Grouts However,the yield stress failed to be estimated by the Lapasin model due to the absence of plastic behavior of cement grouts.In contrast,yield stress can be linearly correlated to the measured relative flow area.In this work,it was also found that the dependence of yield stress of cement grouts on relative flow area is a strongly

Estimation of Viscosity and Yield Stress of Cement Grouts

However,the yield stress failed to be estimated by the Lapasin model due to the absence of plastic behavior of cement grouts.In contrast,yield stress can be linearly correlated to the measured relative flow area.In this work,it was also found that the dependence of yield stress of cement grouts on relative flow area is a strongly Comparison between methods for determining the yield The determination of the yield stress ( 0) of cement-based materials is of great interest for engineering applications,since it accurately describes the flow behavior and assesses empirical properties related to its workability,such as the slump of concretes and the spreading of mortars.In this work,the 0 of cement pastes was determined by different methods.Comparative study of the yield stress determination of Different methods have been proposed in the literature to determine the yield stress of cement grouts.These methods may present wide differences especially for thixotropic materials such as cement pastes.In this paper,different mixtures of watercementsuperplasticizer were studied for various w/c ratios and superplasticizer dosages.

Cited by 16Publish Year 2017Author Mashuqur Rahman,Johan Wiklund,Reinhardt Kotz Yield stress of cement grouts#233;,Ulf H Yield stress of cement grouts#229;kanssonYield stress of cement grouts Request PDF

Rahman et al.[28] measured the yield stress of cement-based grout considering the effect of thixotropy and hydration.In the same work,it was shown that there exists a critical shear rate range Cited by 16Publish Year 2017Author Mashuqur Rahman,Johan Wiklund,Reinhardt Kotz Yield stress of cement grouts#233;,Ulf H Yield stress of cement grouts#229;kanssonYield stress of cement grouts - ScienceDirectIn this work,measurement of the yield stress of cement grout was performed with different measurement techniques using a conventional rheometer.In addition,in-line measurements using an ultrasound based technique were made in order to visualize the flow profile and perform a direct measurement of the yield stress.Two ranges of yield stress Cited by 16Publish Year 2017Author Mashuqur Rahman,Johan Wiklund,Reinhardt Kotz Yield stress of cement grouts#233;,Ulf H Yield stress of cement grouts#229;kanssonYield stress of cement grout Incipientus Ultrasound Flow Sep 07,2016 Yield stress of cement grouts#0183;Rahman,M.,Wiklund,J.,Kotz Yield stress of cement grouts#233;,R.,H Yield stress of cement grouts#229;kansson,U.(2016).Yield stress of cement grout.Tunnelling and Underground Space Technology 61:50-60 September 2016.

Cement Grouts Scientific.Net

Abstract The thesis presents an research on the time-varying behavior of cement grouts with different water-cement ratio of 0.5,0.55,0.6,0.65,0.7,0.75,0.8,0.9,1.0,1.1,1.25,1.0,2.0,5.0 and10.0 at 0 minute,5minutes,10minutes,20minutes,30minutes,60minutes,respectively.This was to investigate the time-varying behavior of reheological parameters of cement grouts with different water-cement ratios Author Zhipeng Xu,Yichen Miao,Haikuan Wu,Xun Yuan,Changwu LiuPublish Year 2020Rheological Properties of Cement-Based GroutsFeb 07,2014 Yield stress of cement grouts#0183;The rheology of cement-based grout is characterized by viscoplasticbehaviour and a yield stress[1] (Figure 1).Injectability,stability (homogeneity and coherence) of the suspension,and rate of maturation are the main prop- erties of freshly prepared grouts [2]-[4].The stress/strain/time properties of dense cement pastes have been tho-4.3.Yield stress determined by constant shear rate test

(PDF) Effects of Polypropylene Fibers and Measurement

Different methods have been proposed in the literature to determine the yield stress of cement grouts.These methods may present wide differences especially for thixotropic materials such as

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