Nitrous acid, calcium salt. Lim et al. 13.8 shows the osmotic pressure of the four fertilizers DS at variable concentrations. UNII-F538343O0T Figure 3.4. Figure 10.2. Yet, as urea is readily soluble in water, it exhibits osmotic pressure in excess of 200 atm at concentrations more than 10 M (Figs. The table below provides information on the variation of solubility of different substances (mostly inorganic compounds) in water with temperature, at one atmosphere pressure.Units of solubility are given in grams per 100 millilitres of water (g/100 ml), unless shown otherwise. Some typical examples are shown in Table 10.1. Nitric acid attack at 10% concentration is especially destructive for NC even after just 7 days immersion. It can be use as antifreeze due to its high solubility, either in solution or powder. Furthermore, research by Jonkers et al. The effect of these compounds on the setting and hardening of concrete is therefore important. Research shows that YE added directly to concrete delays the setting of cement and hardening of concrete. Calcium nitrite. As calcium nitrate basically is a set accelerator, it has to be combined with other chemicals to be a combined setting and hardening accelerator. Yeast extract (YE) contains amino acids, peptides, water soluble vitamins and carbohydrates. Fig. Rule: Important Exceptions 1. Nele De Belie, ... Kevin Paine, in Eco-Efficient Repair and Rehabilitation of Concrete Infrastructures, 2018. Effect of triethanolamine on Portland cement hydration by conduction calorimetry. So, if sweater is the FS, the DS must exhibit an osmotic pressure a lot more than 28 atm. While encapsulation potentially permits a much wider range of materials to be used, it should be noted that compounds that are deleterious to concrete in the hardened state, chloride and sulfate salts for example, should be avoided. Our products are widely used in different industries such as food, chemical and many others. Other soluble calcium salts are calcium nitrite, calcium acetate, calcium propionate and calcium thiocyanate, but without particular use as accelerators either due to effect or price/availability. Thus, since all investigated fertilizers produce osmotic pressure that is way higher than seawater or brackish water, they are suitable for use as an osmotic DS. Peter Nasr, Hani Sewilam, in Emerging Technologies for Sustainable Desalination Handbook, 2018. Other authors [34] also suggested this aluminosilicate depolymerization. 13.11). The chemical precipitation method is the simplest method to prepare pure HA nanoparticles and corresponding silver-substituted HA nanoparticles among all the fabrication methods and widely used in many researches. Calcium Chloride Dihydrate - Lr / Ar / Acs, Home  |  Profile  |  Our Product Range  |  Media Gallery The chemical precipitation method is the simplest method to prepare pure HA nanoparticles and corresponding silver-substituted HA nanoparticles among all the fabrication methods and widely used in many researches. (2007) obtained the silver-substituted HA nanoparticle using calcium hydroxide, diammonium hydrogen phosphate, and silver nitrate by a microwave processing. The least osmotic pressure observed is for urea (46.1 atm at 2.0 M). To this mixture, ammonia was added resulting in a white precipitate settling at the bottom of the beaker. (2010) have suggested that the only organic calcium precursor that may be added directly to the concrete, in any significant quantity and not cause a loss of strength, is calcium lactate. 77101. (2012) gained their silver/silicon-cosubstituted HA nanoparticles using calcium hydroxide, phosphoric acid, silver nitrate, and tetraethyl orthosilicate by a precipitation method similar to the preparation of their silver-substituted HA nanoparticles. Figure 12.7. Calcium nitrite is being manufactured commercially and is available as a proprietary accelerator. The osmotic pressure lineally increases as urea concentration increases. Table 10.1. For the aerobic respiration self-healing pathway, a number of organic calcium precursors have been used. Calcium nitrate alone offered no protection at -4 °C. Species formed and osmotic pressure of calcium nitrate. 10H2O, and the stabilisation of ettringite leading to more bound water, less porosity and thereby higher strength. The dosage rate is of the order of 0.3%–2.3% (as solids by weight of cement). For urea hydrolysis the source of Ca2+ for most early research was calcium chloride, although more recent work has tended towards using calcium nitrate (Wang et al., 2014a,b) to avoid adding chloride ions into the concrete. The transmission electron microscopy (TEM) images of the n-HA and n-SHA dispersed in an alcoholic medium are shown in Figure 3.4. (2014b) used a hydrated form of calcium nitrate (containing around 30% by mass of water) at a dosage of 8% by mass of cement—which is equivalent to a dosage of 5.6% of calcium nitrate by mass of cement. The substances are listed in alphabetical order. However, isothermal conduction calorimetry tests undertaken by Bundur et al. It has also been shown that calcium lactate may actually increase compressive strength when used at percentages up to 1%–2% by mass of cement (Paine, 2016), and potentially up to 3% by mass of cement and higher (Luo and Qian, 2016a). ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. URL:, URL:, URL:, URL:, URL:, URL:, URL:, URL:, URL:, URL:, Science and Technology of Concrete Admixtures, Bioactive Surface Coatings for Enhancing Osseointegration of Dental Implants, Biomedical, Therapeutic and Clinical Applications of Bioactive Glasses, Sol-gel is a wet chemistry approach that uses reagents such as Triethyl phosphite as phosphorus (P) and, Flow restrictions and blockages in operations, S by SRB bacteria is prevented or reduced by reduction of their activity. For example, sweater has an osmotic pressure of 28 atm. XRD patterns of n-HA and n-SHA. This confirms the presence of Sa on the surface of HA fillers. Hence, less soluble magnesium silicate hydrate, or even transition metal silicate hydrates, may be more effective. Analysis was carried out using OLI Stream Analyzer 9.1 software. to synthesize HA nanoparticles; silver-substituted HA nanoparticles can also be made in a similar method by introducing a silver source (such as silver nitrate and silver oxide) into the reaction system (Figure 10.2). Consequently, this could allow for a wider range of calcium salts to be used, as there will be no interaction between the encapsulated salt and the cement matrix—unless there is a failure of the capsules during mixing or casting. W. Tahri, ... J. Aguiar, in Handbook of Low Carbon Concrete, 2017. In self-healing concrete, Wang et al. MAX. Fixing the molar concentration of the DS (say at 2.0 M as per Table 13.4), the next highest osmotic pressure observed is that of ammonium sulfate (92.1 atm).