Retarders are cement additives designed to delay the thickening time of cement slurries.Top of Form The thickening time denotes the duration during which the cement slurry can be manipulated following its mixing with water. 10,11 The problem of inadequate thickening ... encompassing boric acid, phosphoric acid, hydrofluoric acid, and chromic ...
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Tong Li, Yuhao Zheng, Huisu Chen, Tingting Zhang, Rongling Zhang, Thermodynamic effects of chloride's type and dosage on phase composition of magnesium oxysulfate cement and its impact on macro-properties, Cement and Concrete Composites, 10.1016/j.cemconcomp.2025.106032, 160, (106032), (2025).
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Hydrophobic additives have been used in cement and concrete for a long time to reduce water penetration. Hydrophobic agents are chemicals added to cement to widen the angle at which water ... [10][11], adding oleic acid and iminodiacetic acid as an addition to cement enhanced its mechanical and physical properties. Vegetable oils at 0.5 percent ...
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Other inorganic acids such as boric acid, phosphoric acid, hydrofluoric acid and chromic acid as well as their salts are capable of retard hydration of Portland cement. ... The Effect of Key Cement Additives on the Mechanical Properties of Normal Density Oil and Gas Well Cement Systems. Asia Pacific Oil and Gas Conference and Exhibition ...
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Thus, a cationic polyvinyl alcohol (PVA) polymer, modified by glyoxal and boric acid, was discovered due to its excellence in associating with the FLA A additive for controlling the free cement-based material water amount and preventing the chelating effect of FLA A chains on the surface of the cement-based material. Glyoxal/boric acid-modified ...
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purpose, in this study, an experimental study on pumice aggregate as aggregate in lightweight concrete manufacturing and boric acid as additive was carried out. Within this scope, the usage of boric acid as a mineral additive aimed at improving physical, mechanic and micro-structure of lightweight concrete. 2.Material And Method 2.1.Material 2. ...
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Strength and permeability of boric acid-tempered ultrafine cement grouted sand. 2021, Construction and Building Materials ... (Ufc) grouts containing an additive of boric acid (BA) into the sand specimens with different particle size distribution and the engineering properties of grouted specimens were investigated. To begin with, the ...
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Variation in pH of magnesium phosphate cements containing 15% retardant additive (boric acid) and 60% water.
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Water uptake of solid boric acid may increase reactivity by reducing the water content available for flowability and ion transfer, reducing the degree of final cross-linking of the polyalkenoate species in the set cement. Boric acid, as HBO 3 2− or BO 3 3−, may act as a weak polyalkenoate cross-linker [12], but this effect is weaker and ...
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Cement Retarders are essential chemical additive for cementing in oil and gas well. Here, we explain its main mechanisms and common chemicals ... Another hydroxycarboxylic acid with a strong retarding effect is citric acid. Citric acid is also an effective cement dispersant and is normally used at concentrations between 0.1% and 0.3% BWOC ...
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Effect of boric acid (BA) content on the properties of magnesium phosphate cement was evaluated. ... Thus, for the same concentration of boric acid, its effect will be much lower in cement samples using MgO particles with a higher surface area. ... Variation in pH of magnesium phosphate cements containing 15% retardant additive (boric acid) and ...
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They are related to the structure and properties of additives, and the composition of cement, hydration conditions and other factors. In applications, it is only reasonable based on actual conditions The selection can obtain better construction conditions. ... Commonly used boric anhydride or boric acid as a binder for corundum refractories. At ...
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Recently, some researchers modified cellulose by cross-linking reaction. Yin et al. [13] prepared a composite film by cross-linking boric acid with polyvinyl alcohol. T he results showed that the tensile strength of the composite film went up from 2.68 Mpa to 12.15 MPa when the boric acid additive was elevated from 0 % to 1.5 %.
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DEG and boric acid in a basic medium. Keywords Boric Acid, Cement, Glycol, Grinding Aid, Anhydrous Borax, Compressive Strength 1. Introduction Many chemicals have been used as a grinding aid in scientific studies and in the industry. Amines such as triethylenetetramine, aminalols such as diethanola-
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cement (CAC) obtained from CIMSA were used in this study. Also accelerator additive materials such as cal-ciumchloride(CC),sodiumaluminate(SA)wereadded in the mortar mixtures in order to suppress the retard-ing affect of BA to cement hydration. The dosages of cement used in all specimens are equal. Physical and chemicalpropertiesofPC ...
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One of the additives - PFM-NLK (concrete modifier)- a factory fabricated mixture of a superplasticizer with the addition of air-retaining and water proofing substances.Another one is a complex additive containing a superplasticizer, sodium tetraborate and boric acidmon denominator is the content of the superplasticizer.
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Radioactive borate waste containing a high concentration of boron (B) is problematic to be solidified using cement because soluble borate such as boric acid hinders the hydration reaction.
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The hardened MOS cement with chemical additives exhibits high later mechanical strength, ... Citric acid and citrates [29,30], boric acid [31,32], ferric sulfate [33] ...
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The residual strength rate first increases and then decreases with an increasing boric acid, and reaches a maximum value of 29.7% (1wt.% boric acid is added), which is 2.3 times that of the CACC.
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Due to the adverse effects on the cement setting process, the inclusion of boric acid [71, 72] and boron frit is not suited for improving the shielding characteristics of concrete. Boric acid is added up to 3% by weight of cement or 0.5% of the total concrete volume is acceptable.
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Boric Acid, also called hydrogen borate, boracic acid, orthoboric acid and acidum boricum, is a weak, monobasic acid of boron. Boric Acid and the borate salts (Na+, K+ in particular), are well known and have long been utilized in the oilfield in fracturing services. Borates perform exceptionally well in guar slurries as crosslinkers in water-based fracturing fluids, notably in …
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Monoethylene glycol (MEG) and diethylene glycol (DEG) were used as glycol-based grinding aids, and anhydrous borax and boric acid were used as boron compounds in the tests. CEM I type …
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OPC cements can be modified by using a range of additives. These may be defined as additives (at a level of ~5%), such as gypsum, which acts to retard hydration; replacements (at high levels up to 90%) such as BFS or PFA in blended or composite cements; or as admixtures (at levels of ~1%) such as superplasticisers. The main cement modifiers (Tables 15.7 and 15.8) include …
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In this study, different percentages of boric acid 1, 2, 3, 4 & 5% were added to the high-performance concrete (HPC) and the effects on hydration process and strength were …
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The usage of boron containing wastes obtained from boric acid (H 3 BO 3) production or the enrichment process of tincal (Na 2 B 4 O 7 ·10H 2 O) as supplementary materials in cement composites enhances the properties of the cement composites. The gypsum-like composition and pozzolanic features of borogypsum, which is obtained as a by-product of …
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In recent years, various organic or inorganic weak acids and their salts, e.g., boric acid [17], citric acid (CA) [23], trisodium citrate [24], borax [25], and soluble phosphates [26], have been used as additives to enhance the strength of MOS cement by promoting the formation and development of phase 517 whisker.As a result, the phase 517 content of MOS cement …
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Boric acid and borax are the most commonly used inorganic-acid (salt)-type retarder for Portland cement [17]. The thickening time of CAPC with different dosage of boric acid and borax was tested at 75 °C and 0.1 MPa. Results are shown in Fig. 3. It can be seen that, the retarding effect of boric acid and borax in CAPC system is very unstable ...
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Acidic additives such as citric acid [22], [23], tartaric acid [24], phosphoric acid [25], [26], and boric acid [27], [28] have been introduced in large quantities to modify MOS composites. The chelation of Mg 2+ with carboxyl groups can promote the 517 phase with high strength, resulting in improved mechanical strength and water resistance of MOS.
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Fig. 3 displays the density ranges of different cement classes together with the impacts on the density of certain cement additives. Aerated cement has a density in the range of 0.5–1.92 g / c m 3, whereas cement with a weighting agent can reach densities of up to 2.52 g / c m 3, depending on the weighting additive involved [42], [43], [46 ...
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Drilling Mud Additives; Cementing Additives. Retarders & Accelerators; Fluid Loss Control; ... Boric Acid is an intensifier for lignosulfonate cement retarders. It is useful at circulating temperatures over 250°F. Boric acid is normally run with MTR-14 retarder. LTR-10. LTR-10 is a modified calcium lignosulfonate. It can be used to retard the ...
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This research investigated the hydration process and mechanical properties of low-carbon MOS cement containing citric acid and boric acid. ... and citric acid as additives on the mechanical ...
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MOS cement is basically composed of MgO, MgSO 4 solution and appropriate retarders. The compressive strength is primarily determined by the type, relative content and microstructure of hydration products (xMg(OH) 2 ·yMgSO 4 ·zH 2 O phases), as significantly impacted by the molar ratio of MgO, MgSO 4 and H 2 O, as well as temperature.Demediuk …
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Boric acid: ×: The first ... Calcium aluminate cement is another setting additive that can be used with monoaluminum phosphate forming a composite bonding phase of Ca(H 2 PO 4) 2 and 3CaO·Al 2 O 3 ·6H 2 O. Also, alkali phosphates such as sodium phosphates and alkaline phosphates can be used as a binder.
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The purpose is to determine the feasibility of commercially available B 4 C powder as a radiation shielding additive to structural concrete. Experimental and analytical programs were developed to measure the effects of B 4 C content on cement hydration kinetics, ... (boric acid) acts as a cement retarder even in very small percentages [2], [7], ...
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does not significantly affect the concrete structure. And boric acid had a negative effect on concrete strength development. Also,the rate of boric acid leaching, as with other concrete degradation mechanisms, depends in part on the rate of diffusive transport and compressive strength, expansion and setting time properties of cement
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Explore the use of MEG and DEG as grinding aids and borax and boric acid as boron compounds. Uncover the effects on compressive strength and fineness. ... Much of these studies were about using boron compounds as mineral additive materials in portland cement. In the work of Elbeyli and his colleagues, the effects of ordinary borogypsum and ...
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To enhance the early performance of magnesium potassium phosphate cement (MKPC) and compensate for loose of compressive strength caused by the addition of boric …
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In this study, the effects of boric acid addition to pumice aggregate lightweight concrete at different ratios (Ref: 0%, 2%, 4% and 6%) were investigated.
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Optibor boric acid; ... and use fluid additives, such as borates, that enhance performance. Because of their unique properties, you can use borates across your production lifecycle to improve operations and support key infrastructure. Borates are commonly used to: Control cement setting rates (retardants) Cross-link polymers. Inhibit corrosion ...
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