Influence of set retarding admixtures on calcium sulfoaluminate cement hydration and property development

Burris, Lisa E.; Kurtis, Kimberly E.

doi:10.1016/j.cemconres.2017.11.005

Cited by 80 publications

(24 citation statements)

References 23 publications

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“…For mixed use of retarding admixture, such as mixture Nos.13 and 14, the compressive strengths at 1 and 28 days are 53.9 and 88.7 MPa, 6.5 and 88.8 MPa respectively, with the corresponding initial setting time being 180 and 690 minutes. The above results are consistent with previous research results ( Burris and Kurtis 2018), where CSA cement pastes, especially those with greater retarder dosages, appear to show a regression in strength over time. Figures 8 and 9 display the variation of shear stress and viscosity for cement paste vs. paste mixing time with the addition of different supplementary cementitious materials, including fly ash (FA), silica fume (SF) and furnace slag (SG), with Figs.…”

Section: Effect Of Retarding Admixturesupporting

confidence: 93%

“…Relatively little is known about the mixture design that links the selection of material proportioning with the desired fresh and hardened properties, such as the retarder dosage and development of strength and elastic modulus of the concrete. Currently, citric acid and sodium borate are both primary set retarding agents recommended for use in CSA cement concrete (Burris et al 2018;Champenois et al 2015).…”

Section: Introductionmentioning

confidence: 99%

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Effects of Retarding Admixture, Superplasticizer and Supplementary Cementitious Material on the Rheology and Mechanical Properties of High Strength Calcium Sulfoaluminate Cement Paste

Zhang

2020

ACT

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In this paper, the effects of retarding admixture, polycarboxylate (PCE) superplasticizer and supplementary cementitious material (SCM) on the rheology of high strength calcium sulfoaluminate (CSA) cement paste are investigated. At the water to binder ratio of 0.3, one PCE, two retarding admixtures, and three SCMs were used in the test. The test results show that much more PCE is needed for paste with citric acid than that with sodium borate to achieve a similar initial flowability. The reference paste and pastes mixed with sodium borate or fly ash exhibit shear thickening; pastes mixed with citric acid or silica fume exhibit shear thinning. The addition of citric acid increases the maximum shear stress of pastes, while the maximum shear stress can be significantly reduced by silica fume. Both the retarding admixtures and SCMs will strongly reduce the early-age compressive strength of the cement paste. At 28 days of age, CSA cement paste incorporating retarding admixtures has comparable strength to the reference paste. Silica fume has less negative effect on the compressive strength of the CSA cement paste due to the significant filling effect.

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Section: Effect Of Retarding Admixturesupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Effects of Retarding Admixture, Superplasticizer and Supplementary Cementitious Material on the Rheology and Mechanical Properties of High Strength Calcium Sulfoaluminate Cement Paste

Zhang

2020

ACT

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“…Due to their rapid-hardening, poor workability [23][24][25] and their low pH as compared to OPC, CSAs have been widely used in small-scale repairs [26], permeability resistance engineering [27,28] and waste encapsulation [29][30][31]. In order to extend their use to larger-scale applications, addition of superplasticizers and retarders were suggested by several authors [24,26,32]. Polycarboxylate superplasticizers (PCE) are the newest and the most widely used superplasticizers in concrete.…”

Section: Introductionmentioning

confidence: 99%

“…PCEs are known to well improve the initial fluidity of CSA pastes, but lose their dispersion efficiency rapidly due to the high reactivity of CSA [24]. Retarders, such as borax [36][37][38][39], sodium gluconate [37,40], tartaric acid [37] and citric acid [26,38,40], may be used in order to overcome the quick loss of dispersion efficiency of PCEs. In cement paste, these retarders tend to form a highly negatively charged complexes with Ca 2+ [36,37,41,42], and adsorb on the surface of minerals leading to a decrease in the consumption of free water and PCEs by the hydrates [36].…”

Section: Introductionmentioning

confidence: 99%

Influence of polycarboxylate superplasticizer, citric acid and their combination on the hydration and workability of calcium sulfoaluminate cement

Belhadi

Govin

Grosseau

2021

Cement and Concrete Research

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PCEs are well known to improve the initial fluidity of CSA. However, their dispersion efficiency drops quickly over time. This issue can be solved by incorporating retarders. In this context, this paper deals with the influence of citric acid, used as a retarder, PCE and their combination on the hydration and workability of CSA. Isothermal calorimetry, XRD and TG analysis were used to describe the hydration process, while workability was characterized with the mini-cone test. Adsorption behavior was investigated using total organic carbon analyzer coupled with ion chromatography. Results show that the introduction of citric acid retained the dispersion efficiency of PCE over time. However, the initial dispersion efficiency of PCE was decreased by citric acid as the latter tend to adsorb first on the surface of cement grains, inhibiting the adsorption of PCE. A dispersion model was proposed to describe the acting mechanism of these admixtures on CSA.

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“…Calcium sulphoaluminate cements (CSA) are promoted as one of the most promising cementitious materials due to their outstanding properties such as lower CO 2 emissions [ 1 ], fast setting and hardening, high early strength [ 2 ], impermeability [ 3 ] and good durability [ 4 ]. In recent years, CSA has been attracting more and more attention in the fast repairing of civil structures [ 5 ], waste stabilization/solidification [ 6 ], as expansion material for shrinkage compensation [ 7 , 8 ] and low-temperature construction projects [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Research on the Hydration Properties of C4A3S-CSH2 Cement System at Different Temperatures

Lan

Chen

et al. 2020

Materials

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Sulphoaluminate cement has the advantage of low-temperature application performance, but its hydration mechanism at low temperatures is not yet clear. Anhydrous calcium sulfoaluminate (C4A3S) is the main mineral in the composition of sulfoaluminate cement clinkers. In this paper, C4A3S mixed with gypsum (CaSO4∙2H2O) to form a C4A3S-CSH2 cement system; X-ray diffraction (XRD), thermogravimetric analysis (TG-DTG), scanning electron microscopy (SEM) and mercury intrusion analysis (MIP) to clarify the effect of temperatures on the hydration properties of C4A3S-CSH2 cement system. The results showed that hydration of the C4A3S-CSH2 cement system could carry on at low temperatures, even at −15 °C. The main hydration product was ettringite. Low temperatures did not change the types of the hydration products, but the low temperature of 0 °C was more favorable for the formation of ettringite. The early hydration of the C4A3S-CSH2 cement system was inhibited by the decrease in temperature. However, hydration of the cement at 0 °C continued at a high rate after one day. Morphologies of the ettringite for the C4A3S-CSH2 cement system at −15 °C were needle-like structures, while they were of columnar structure at 0 °C. The compressive strength of samples at 0 °C reached 82 MPa, which is significantly higher than that at 20 °C.

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Influence of set retarding admixtures on calcium sulfoaluminate cement hydration and property development

Cited by 80 publications

References 23 publications

Effects of Retarding Admixture, Superplasticizer and Supplementary Cementitious Material on the Rheology and Mechanical Properties of High Strength Calcium Sulfoaluminate Cement Paste

Effects of Retarding Admixture, Superplasticizer and Supplementary Cementitious Material on the Rheology and Mechanical Properties of High Strength Calcium Sulfoaluminate Cement Paste

Influence of polycarboxylate superplasticizer, citric acid and their combination on the hydration and workability of calcium sulfoaluminate cement

Research on the Hydration Properties of C4A3S-CSH2 Cement System at Different Temperatures

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