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Control of Viscosity of Cementitious Materials Using Waste Limestone Powder
International Journal of Concrete Structures and Materials volume 13, Article number: 28 (2019)
Ultra high performance cementitious materials possess high solid volume fraction by a decreased water-to-binder ratio. The use of a high-range water reducing admixture allowed us to obtain the initial fluidity of ultra-high performance cementitious materials, but its poor workability and significant loss of fluidity remained. Incorporating a high volume of supplementary cementitious materials reportedly weakens workability because they reduce the plastic viscosity of a mix. Hence, in this research, waste limestone powder was tested to evaluate its effect on the rheological properties of cement paste. The results give new insight on controlling the fluidity and plastic viscosity when preparing the mix for ultra-high performance concrete.
For construction application, concrete development has focused on improving fluidity to assure a fresh state performance. The conventional approach was based on the mixture’s water control (both unit water content and water-to-cement ratio); thus, introducing a high-range water-reducing admixture (HRWRA or superplasticizer) was an innovative contribution. After introducing the concept of rheology, the fluidity of cementitious materials can be controlled further with yield stress and plastic viscosity. According to Wallevik et al. (2011), many factors influence the yield stress or plastic viscosity of cementitious materials. HRWRA is the most widely used method to improve fluidity of cementitious materials due to its ability to decrease the yield stress (Winnefeld et al. 2007; Mikanovic and Jolicoeur 2008). The recent trend of developing polycarboxylates, the main component of HRWRA, helps decrease viscosity as part of the overall effort to lower yield stress. Incorporating such an HRWRA may control the yield stress and viscosity independently, but still the use of supplementary cementitious materials or filler is an in-hand solution in field.
In practice, it is sometimes inconvenient to handle high performance cementitious materials with a very low water-to-binder ratio (w/b): it shows extremely high plastic viscosity even though enough dosage of HRWRA is incorporated to achieve a sufficient fluidity (Yen et al. 1999; Vikan and Justnes 2007; Mazanec et al. 2009). Hence it is very important to control not only yield stress but also the plastic viscosity of cementitious materials. As a method of controlling the plastic viscosity of cementitious materials, there are two well-known ways: increasing the sand-to-aggregate ratio for mix design and using a viscosity modifying admixture (Leemann and Winnefeld 2007). The recent trend of manufacturing high performance concrete mixtures is changing the common ready mix methodology by decreasing portions of coarse aggregate as well as Portland cement, which is achieved by incorporating supplementary cementitious materials. It also contributes to the plastic viscosity of high performance concrete.
On the other hand, particles in concrete come in various sizes, shapes, and forms, e.g., cement, fine aggregate, and coarse aggregate. Therefore, because of these different size particles, freshly mixed concrete can assume a complex movement (Farzam et al. 2000; Mindess et al. 2002; Neville 2012; Mehta and Monteiro 2013). Cement paste can be considered a base substance determining the fluidity of the other materials in the particle hierarchy of mortar and concrete (Toutou and Roussel 2007; Erdem et al. 2010). Rheological behavior of paste is influenced by particle types (Kim et al. 2012) and conditions (Erdoğan et al. 2008; Nair and Ferron 2014; Han and Ferron 2015). For cement paste, flocculation and breakage of particles were determined by hydration of particles and colloidal forces (Yang and Jennings 1995; Roussel 2005; Yim et al. 2014; Kim et al. 2016). However, without these interparticle forces in fresh state cement paste, different particle sizes also influence the rheological properties (Pons et al. 2006; Bentz et al. 2012). For different particle sizes and particle size distributions, specific surface and packing density are the main factors dominating rheological behaviors (Roy and Asaga 1979; Coussot 2005; Roussel 2005; Dils et al. 2013) . First, the specific surface of a particle is increased with decreased particle size. Without any repulsive forces such as a water reducer, an increased specific surface induces an increased wettable surface area (Nehdi et al. 1998); thus, the required water content is increased. It can be inferred that an increased specific surface with small particles causes increased yield stress and plastic viscosity. The packing density is a key element, which determines the plastic viscosity of the paste. Based on the idea of inverse fluidity for plastic viscosity, particles in cement paste gives the paste a higher plastic viscosity than fluid without particles. Furthermore, the paste including the particles with a higher maximum packing density (capability of particle number for certain thickness of sheared fluid) has a lower plastic viscosity than the paste including particles with low maximum packing density (Krieger and Dougherty 1959). In addition, according to the Krieger-Dougherty model (see Eq. 1), the viscosity of the medium (controlled by using a viscosity modifying admixture and the intrinsic viscosity (determined by the shape of cement grains) are the factors affecting the viscosity. However, in practice, it is difficult to change the particle shapes in the medium and the intrinsic viscosity. However, for the cement paste system, the most easily controllable factor is the packing density, which is achieved by changing particle size distribution (Toutou and Roussel 2007).
where, η, η0, and [η] are the viscosity of the suspension, the viscosity of the medium, and the intrinsic viscosity, respectively, ϕ and ϕm are the volume concentration of particles and the maximum packing, respectively.
In this research, to control the plastic viscosity of the cement paste, especially, decreasing plastic viscosity, the particles with different sizes were replaced. According to Bentz et al. (2012), by inducing different particle size distribution using fly ash, rheological properties of cement paste was controlled. Although fly ash is a widely used supplementary cementitious material, it is difficult to use fly ash solely for viscosity control because it has its own reactivity with late early-age strength development (Berry et al. 1994; Sebök et al. 2001) and other effects, including the reduction of cement paste pH. Hence, in this research, using waste limestone powder (WLP), influence of rheological properties of the cement paste evaluated, and it is expected to contribute to providing a fundamental idea on controlling plastic viscosity of the ultra-high performance concrete.
Materials and Sample Preparation
To evaluate the effect WLP on plastic viscosity of concrete, our experiment was conducted in the paste phase. Based on the cement pastes of three different low w/b, their viscosities were measured. All mixtures contained superplasticizer. The dosage of superplasticizer was controlled from the minimum recommended application, which produced too thick of a mixture to be measured with a rheometer to the maximum application, which produced a mixture showing cement segregation and bleeding. Superplasticizers are used as a chemical admixture. For normal cement paste without any dispersing admixture or plasticizer, cement particles are flocculated and coagulated (Yang and Jennings 1995). Therefore, in this research, focusing solely on the relationship between particle conditions provided by the mix design, superplasticizer was added at a prefixed dosage to achieve a yield stress of zero. The superplasticizer used in this research was a polycarboxylate-based superplasticizer and it is commercially available in South Korea. The WLP was replaced 10%, 20%, and 30% of cement mass as a main control factor. Table 1 summarizes the mixture conditions and lists the dosages of superplasticizer.
Cement used in this research was ordinary Portland cement available in South Korea. The properties of this cement are similar to Type I cement as regulated in ASTM C150 (ASTM International 2012). The basic physical properties of cement powder are: specific gravity, 3.13; fineness, 3660 cm2/g, and with content possessing a fineness of less than 45 μm, the volume is 89.0%. The WLP used in this research is a low-quality waste limestone, which is a byproduct of the cement manufacturing process. The WLP was rejected due to its dimension, but its chemical composition and purity still meets the standards of cement manufacturing. That means the powder is inert in a concrete mix and can be considered as filler. The WLP was prepared at three different fineness levels: because it comes from cement manufacturing powder, the WLP was originally ground into two different fineness levels. After the grinding process, three different WLP s with different fineness levels were obtained: 1880, 4120 and 7340 cm2/g, which were labeled as L2000, L4000 and L7000 powders, respectively. L2000 was the original WLB, and L4000 and L7000 were produced by ball-milling. Their specific gravity was 2.73. The physical properties of cement, and WLP s are summarized in Table 2.
In this research, all tests were conducted in the paste phase. The sample mixtures were mixed with an agitator with a vane-shaped impeller. The mixed sample amount was 130 g. The mixing protocol was introducing powders in the mixing water containing chemical admixtures and mixing at 400 rpm for 5 min. This mixing intensity was chosen according to Han et al.’s research (Han and Ferron 2015, 2016) on unexpected flocculation of the particles, foaming, and temperature change with high mixing intensity using a superplasticizer.
Analyzing the powder properties used in this research is important to understand the relationship between changing rheological properties and various powder combinations. Therefore, the particle size distributions of three different WLPs were measured using a light scattering method. Figure 1 shows the results compared with that of the cement used. Based on these data, specific surface area and mean particle sizes were calculated. Assuming that each particle is a sphere made the calculation simple. Because the cubic root of the measured mass (or volume) distribution had the same density, the diameter distribution and the mean particle size was given by the mean of the diameter distribution. The specific surface area was then obtained by squaring the diameter distribution and then taking its mean. Lastly, the packing density of the particles was calculated by the compressive packing model proposed by de Larrard (1999).
The spread of cement paste was measured to intuitively show its fluidity. The test was similar to the slump flow test, ASTM C1611 (ASTM International 2010), but different dimensions of slump cone were used. The cone was 62 mm and 70 mm for the top and bottom inner diameter, respectively. The height of the cone was 40 mm. Because of the small size of the cone and well-flow mixtures, the cone was quickly filled. The flow measurement was conducted at two 90° crossed centerlines of the flown mixture and then averaged.
To quantitatively evaluate the rheological behavior of mixtures, each flow curve of the sample mixtures was measured with the rotational MARS III rheometer from Thermo Fisher Scientific, Inc. (Waltham, MA, USA). The measuring geometry used the parallel plates of 35 mm diameter with 1 mm gap. The rheological measurement was conducted with the mixture right after the mixing and the temperature was set at 23.5 °C. The relative humidity of the lab was 24%. To obtain the flow curve of each mixture, an applied shear rate was increased with the step-up method. As shown in Fig. 2, the shear rate was applied with 10 steps up and 10 steps down from 0.01 s−1 to 50 s−1 as 0.01 s−1, 0.1 s−1, 1 s−1, 3 s−1, 5 s−1, 10 s−1, 20 s−1, 30 s−1, 40 s−1 and 50 s−1. Those ranges proved suitable for sensitively and accurately simulating the gravity-induced flow of cement-based materials (Kim et al. 2015). Although the flow curves of concrete are generally explained by the Bingham fluid model, the measured data in this study gave a zero-yield stress due to the high fluidity of the paste samples. Only plastic viscosity was considered as the rheological property of the samples.
Physical Conditions of Mixed Powders
Particle Condition of Single Powders
Based on the measured particle size distribution, the physical properties of cement, L2000, L4000, and L7000 powder were calculated (see Table 3). As shown in the table, the change on the packing density was much less than the variation of mean particle size. Compared with the cement powder, the original WLP (L2000) consisted of larger particles. For WLP, as the grinding was increased, the mean particle size decreased and the specific surface increased. On the other hand, as the grinding increased, the packing density decreased. This was considered as the milling process continued; thus, the size of the WLP particles was equalized by grinding. Considering cement powder, the raw WLP had the highest packing density. Based on these results, for a single powder, the raw WLP consisted of relatively well-graded particles.
Particle Conditions of Mixed Powders
Based on the single powder physical properties (see Table 3), mixed powder physical properties are calculated and summarized in Table 4. Since the density of WLP was lower than that of cement, as the replacing content of WLP was increased, the entire density of the powder was decreased. For packing density of the mixed powders, when WLP was used to replace 20% of the standard content, the packing density was calculated at its highest value regardless of WLP particle size. Similar to the packing density result, the specific surface of the powders showed the highest value at 20% WLP replacement.
Determining Acceptable Dosage of Superplasticizer
The acceptable range of the superplasticizer dosage was determined for the paste samples to obtain the plastic viscosity of 0.1 to 2.0 Pa·s at which it was unable to measure with the rheometer and the plastic viscosity at which bleeding was observed. The acceptable ranges of the pastes depending on water-to-cement ratios are shown in Fig. 3. As the w/b was decreased, a higher dosage of superplasticizer was needed. Additionally, the yield stress of the cement paste decreased toward zero. Notably, it was impossible to operate the rheometer out of the acceptable range (e.g., if the plug flow had too high of a viscosity and yield stress) or if a migration of the mixing water was evident (i.e., too low of a viscosity). Hence, it can be stated that depending on the w/b or volume fraction, superplasticizers have a certain threshold or optimum dosage. Although this threshold can vary depending on the mixture’s chemical properties, cement powder fineness, shape or properties of the polymer chain, and volume fraction of superplasticizer, this threshold is not discussed because it is out of the work scope. Also, based on this result, it is considered that there is a limitation to superplasticizer dosage when decreasing the viscosity of cement paste depending on a certain w/b or volume fraction. Therefore, it can be stated that to overcome this limitation, other factors should be controlled such as changing the volume fraction or applying an improved superplasticizer.
Fluidity Analysis with Spread Test
During the test, two values were measured: (1) a final spread diameter and (2) time to spread of 200 mm. According to former research (Saak et al. 2004; Flatt 2004; Roussel and Coussot 2005; Wallevik 2006; Tregger et al. 2008; Rößler et al. 2008; Laskar 2009), it is known that the slump and the slump flow of cementitious materials relate to yield stress. Additionally, when the time to reach a certain distance for cementitious materials is measured, it can be considered as a flowing speed; hence, it can be connected with plastic viscosity (Tregger et al. 2012).
Within the acceptable ranges for each mixture, spread diameters are summarized in Fig. 4. Unlike many other research efforts, in this case, it was impossible to compare or contrast with the mixtures of different w/bs because the dosage of a superplasticizer will vary depending on whether mixtures achieve “zero” yield stress. Hence, the analysis of the w/b effect on the pastes’ behavior are invalid in this research. As shown in the figure, most cases incorporating WLP showed an improved fluidity with an increased spread distance. Depending on different fineness grades of WLP, generally, L2000 powder consisted of relatively large size particles and was the most efficient on improving fluidity with a longer spread distance. Additionally, as the particle size was decreased from L2000 to L7000, the fluidity of cement pastes decreased with a shorter spread distance. This can be deduced as an increased yield stress based on former research, although all mixtures used in this research are controlled to zero yield stress by the superplasticizer or other factors including the fact that factors can influence plastic viscosity, which could have a major effect on spread distance. In addition, the time it takes to implement a 200 mm-spread was measured for the pastes, and the results were also listed in Table 5. However, we could not capture the 200 mm-spread, which is the trend for all mixtures. Only the mixtures with w/b 0.30 showed a trend of decreased time as the particle size of the powder was becoming small. Therefore, it can be stated that a viscosity measurement using a spread test is not appropriate for a high-fluidity low-w/cm paste (generally for UHPC).
According to the powder properties, plastic viscosity was obtained and compared in Fig. 5. Compared with a control mixture without any WLP replacement, most mixtures incorporating WLP show a lower plastic viscosity. Depending on the w/b of the mixtures, as the w/b decreases, the plastic viscosity increases. The trend is not immediately evident because the superplasticizer dosage is the main factor affecting fluidity enhancement. A certain threshold is set to control the plastic viscosity of a very low w/b concrete mixture by powder replacement or particle conditions depending on the w/b as it relates to the WLP. For the mixture of 0.30 w/b with 0.5% superplasticizer, as the replacement ratio of WLP increased, the plastic viscosity decreased. The other mixtures with a lower w/b and various dosages of superplasticizer gives a reduced plastic viscosity except for L7000. For example, in the case of the mixture 0.25 w/b with 0.8% superplasticizer, at 10% to 20% of replacement ratio of WLP, the results follow at similar trend while at 30% of the WLP replacement ratio, the plastic viscosity decreased considerably compared to other mixtures. This can be caused by an excessively high superplasticizer dosage of 3.5% to 4.0%. For the mixtures of 0.30 and 0.25 w/b with 0.5% and 0.8% superplasticizer, as the replacement ratio of WLP increased, the plastic viscosity decreased, and this trend was more evident than the mixture with 0.20 w/b. Among the same replacement ratio of the WLP, as particle size or fineness was decreased from L2000 to L7000, plastic viscosity of the mixture was increased. This increased plastic viscosity with smaller particles was caued by the particles’ increased specific surface.
There is a certain range to control (precisely decrease) the plastic viscosity by replacing powder with WLP. The range was additionally investigated based on yield stress and plastic viscosity. Previous researches proposed the relationships of the mini-slump flow-yield stress and the time to reach final spread-plastic viscosity of pastes mixtures (Roussel and Coussot 2005; Wallevik 2006; Tregger et al. 2008). Thus, the additional mini-slump flow test was conducted with L2000-cement paste mixtures having the same mix proportion. The yield stress (τ0 in Pa) and apparent plastic viscosity (np in Pa.s) of mixture can be calculated as
where Df and Tf are the final mini-slump flow measurement in meters and the time measured in seconds, respectively. Figure 6 shows a Rheolograph image of the example mixtures. All results show that the higher WLP replacement induces the lower rheological properties regardless of w/b, which is more clearly shown in the samples of 0.30 water-to-cement ratio. This corresponds with the previous results of the plastic viscosity measurement. Another understanding concerning the Rheolograph reading is that a lower w/b sample has a higher plastic viscosity at the same level of yield stress (or fluidity). However, the argument on the plastic viscosity of the pastes produced with 0.25 or 0.20 w/b is hardly obtained here and so the plastic viscosity measurement in the previous section is still effective for a quantitative evaluation.
In summary, for mixtures incorporating WLP, the viscosity of the paste depends on the mixture conditions with three effect factors: (1) w/b (2) WLP replacement ratio, and (3) fineness of the WLP. The different powder properties such as volume fraction, packing density, and specific surface are summarized in Table 6. Depending on the w/b of the mixtures, as the w/b of the mixture was decreased, the plastic viscosity increased. The w/b can be converted into the volume fraction of the mixtures depending on the mix proportion. Thus, increasing volume fraction increases the plastic viscosity of the suspension. In aspect of volume fraction depending on w/b, the plastic viscosity was increased with increased volume fraction. However, within the same w/b, although the volume fraction increased with the increased replacement ratio of WLP, the plastic viscosity decreased (see Fig. 7). Namely, the replacement ratio of the WLP increases the volume fraction and changes other factors, which decrease plastic viscosity. The other factors dominate the plastic viscosity rather than the volume fraction with WLP replacement in this research scope. Regarding the factors related to replacement of the WLP, the volume fraction increased, and the packing density also changed. We found that hydrating activity can be decreased with a decreased amount of cement. For packing density with WLP, the packing density was calculated based on the particle size by analyzing data from powders, but the actual paste had dispersed particles in the suspension (or cement paste) with superplasticizer and hydration product. Therefore, in this research scope, it is difficult to show the influence of packing density related to the replacement ratio of WLP on plastic viscosity. In addition, the hydration activity of suspension decreases when replaced with WLP without reactivity and ionization. Hence, it may decrease the ionic concentration for aggregation of cement particles and hydration rate (Ferron 2008; Han 2014; Han and Ferron 2015, 2016). In this research, although these ionic conditions and hydration kinetics were not evaluated, based on former research, their effect can be considerable. Therefore, by using WLP, the possibility of controlling plastic viscosity of ultra-high performance concrete mixture was provided. Although there are some limitations, based on this research scope, the fineness of WLP with specific surface is considered an important factor rather than packing density.
To provide a fundamental idea on a way to reduce plastic viscosity of ultra-high performance concrete with a high volume fraction of powder, in this research, the fluidity change depending on replacing WLP was evaluated. For the WLP, as a byproduct of the cement manufacturing industry, three different fineness grades of powders were prepared. Therefore, the influence of the w/b, the WLP replacement ratio, and the fineness of WLP on fluidity and plastic viscosity of the cement paste was evaluated. Depending on the different factors related to the mixture, fluidity and plastic viscosity varied. First of all, depending on the powder properties of fineness or the replacement ratio, the powder properties were changed, such as packing density, specific surface and volume fraction with w/b. From the spread test, replacing WLP caused increased spreading distance with improved fluidity. Hence, all these changed powder properties were expected to influence fluidity or plastic viscosity of the mixtures, but it was difficult to match with a linear correlation. It is considered that the complex dispersing conditions in suspension with superplasticizer induce the complex relationship with powder properties. However, it was not a linear relationship, and the volume fraction, packing density, and specific surface were related to the plastic viscosity of the paste.
waste limestone powder
high-range water-reducing admixture
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DH contributes to data analysis and draft writing; JYY accomplished necessary experiments; and JHK led the study and discussion. All authors read and approved the final manuscript.
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2015R1C1A1A02036892).
The authors declare that they have no competing interests.
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Han, D., Yoon, J.Y. & Kim, J.H. Control of Viscosity of Cementitious Materials Using Waste Limestone Powder. Int J Concr Struct Mater 13, 28 (2019). https://doi.org/10.1186/s40069-018-0325-9
- high performance cementitious materials
- waste limestone powder