At room temperature, anhydrous sodium hydroxide is a white crystalline, odorless solid that absorbs moisture from the air. It is produced as flakes, pellets, sticks, and cakes. When dissolved in water or neutralized with acid, it liberates substantial heat, which may be sufficient to ignite combustible materials. Sodium hydroxide is caustic and is one of …
Does lye affect concrete? Sodium hydroxide (NaOH), also known as sodium hydrate, caustic soda, and lye, is commonly used in oil refineries, manufacture of paper, paints, plastic, soaps, and many other common products. This caustic soda, being on the opposite end of the pH values scale from acids, also, will disintegrate concrete. ...
Geopolymerization can transform a wide range of waste aluminosilicate materials into building and mining materials with excellent chemical and physical properties. The present experimental study investigates the effect of sodium silicate/sodium hydroxide ratios on the feasibility of geopolymer synthesis at 80 °C using fly ash. The …
Calcium, ammonium, barium and strontium hydroxides are normally harmless, but sodium hydroxide may cause damage. Salts are chemical compounds usually formed by reaction between acids and bases. Some of the salts best known for …
During the early stages of concrete curing, the hydrated cement contains some calcium hydroxide (lime) from the reaction between water and cement in the concrete mix. When the calcium hydroxide migrates through capillary action by water to the surface, as the concrete cures, it combines with carbon dioxide in the air to form a …
I know PVC has been widely used in this sort of application, but I'm unable to find documents on concrete's chemical reactivity with plastic. A. According to Bernard Erlin, the principal chemicals in concrete that could conceivably attack plastics are calcium hydroxide, sodium hydroxide and potassium hydroxide.
In many paper making processes, wood is treated with a solution containing sodium sulfide and sodium hydroxide. This helps dissolve most of the unwanted material in the wood, leaving relatively pure cellulose, which forms the basis of paper. In the paper recycling process, sodium hydroxide is used to separate the ink from the paper fibers …
1. Introduction. Sodium and potassium water glasses are known as very effective accelerators of cement in shotcretes based on Calcium aluminate cement [[1], [2], [3], [4]].But the use of sodium silicates have effect on the sensitivity to efflorescence and alkali-silica reaction [[5], [6], [7]].The effect of alkali activation on the setting and curing …
The individual effect of sodium hydroxide (NaOH) and magnesium chloride (MgCl 2) on the performance of magnesia-based cement is the main focus of this study.Different magnesium oxide–glass waste (MgO–GW) mixtures of MgO-to-SiO 2 molar ratios (MgO / SiO 2) of 1, 2, and 3 were prepared and characterized.The results …
Caustic Soda (sodium hydroxide) 1.25 Hydrated Lime (calcium hydroxide) 1.35 Limestone (calcium carbonate) 1.00 Sodium Carbonate (Soda Ash) 0.94 Sodium Bicarbonate 0.60 Sodium Hypochlorite 0.67 An important factor to note is that sodium hydroxide and lime only shift the species to the carbonate ion and do
The test procedure also uses high-alkali cement meeting an alkali content of 0.90 % ± 0.10 % and adding sodium hydroxide to the mix water to raise cement alkalis to 1.25 %. Like the 1-year CPT test, a 75 mm x 75 mm x 285 mm sample size is prepared and cured over water for six months at 60 °C (140 °F).
Sodium hydroxide treatment has been found to improve the properties of banana stem fiber. The treatment enhances the fiber-matrix compatibility, resulting in better interfacial bond strength between the fiber and the matrix. This leads to improved tensile strength, flexural strength, and modulus of the composite materials . The treated fibers also …
The aim of this study is to investigate the effect of surface modification through sodium hydroxide (NaOH) treatment and fiber length on the tensile strength of coir fiber of reinforced epoxy composites. The coir fibers were treated with 2%, 4%, 6%, 8%, and 10% concentration of NaOH separately for 10 days. The tensile strength of …
Sodium hydroxide (NaOH) - Sodium hydroxide is an ionic compound. The molecular weight of sodium hydroxide is 40 g/mol. It is a white, translucent crystalline solid and used in the manufacturing of detergents and soaps. To learn about the structure, Properties, Preparation, Uses, Health Hazards and FAQs of Sodium hydroxide (NaOH) . Visit …
Many admixtures are used in portland cement concrete (Ref 3), but sodium hydroxide is not one of them. $NaOH$ is used as a …
Concentration of sodium hydroxide is the most important factor for geopolymer synthesis [10]. The solubility of aluminosilicate increases with increase in hydroxide concentration …
EFFECT OF SODIUM HYDROXIDE CONCENTRATION ON FRESH PROPERTIES AND COMPRESSIVE STRENGTH OF SELF-COMPACTING GEOPOLYMER CONCRETE ... SCGC is an innovative type of concrete that does not entail vibration for placing it and can be produced by complete elimination of ordinary Portland cement [14]. This research …
Ezeagu et al studied the effect of alkali of sodium hydroxide on concrete using mortal-bars and found out the total softening and expansion of the concrete mortal bars as a result of alkaline ...
In this work, microencapsulated sodium silicate in both liquid and solid form was added to cement specimens. Sodium silicate reacts with the calcium hydroxide in hydrated cement paste to form calcium-silicate-hydrate gel that fills cracks. The effect of microcapsule addition on rheological and mechanical properties of cement is reported.
Cement - Composition, Properties, Major Cements: Portland cement is made up of four main compounds: tricalcium silicate (3CaO · SiO2), dicalcium silicate (2CaO · SiO2), tricalcium aluminate (3CaO · Al2O3), and a tetra-calcium aluminoferrite (4CaO · Al2O3Fe2O3). In an abbreviated notation differing from the normal atomic symbols, …
Sulphate attack on concrete. Most of the soil types contains sulphates in the form of calcium, magnesium, sodium, ammonium and potassium. They occur in soil or ground water. When a concrete structure is built on these …
Based on the results of hydrolysis and tensile test It was concluded that (a) the concentration of sodium hydroxide had an effect on the amount of lignin, cellulose, and hemicellulose contained in ...
Quicklime (calcium oxide) is a widely used chemical compound used for mixing mortar, acting as a flux in smelting processes, and treating wastewater. When dry, quicklime is not excessively …
Increasing the alkalinity of cement pastes by adding sodium hydroxide is known to increase the initial rate of hydration, thereby increasing early strength. The effects on the …
342 Vol.25 No.2 HUANG Yun et al: Effect of Sodium Hydroxide on the… DOI 10.1007/s11595-010-3342-7 Effect of Sodium Hydroxide on the Properties of Phosphogypsum based Cement HUANG Yun, LIN Zongshou (Key Laboratory of Silicate Materials Science and Engineering Ministry of Education, Wuhan University of …
In contrast, for silica gel a higher rate of dissolution for potassium hydroxide than for sodium hydroxide has been observed experimentally [25]. Because little data exist on the combined effect of various ions [26], statements about the influence of K/Na-ratio on the rate of dissolution in alkaline conditions is difficult. The substantial ...
The experimental results show that, NaOH as an alkali activator significantly reduces the cement setting time and improves the cement early strength. But the …
Accelerating admixtures affect the rates of reactions between cement and water to give an overall increase in the hydration rate. Thus, the use of accelerators in concrete provides a shortening of ...
Recently researchers have investigated the mechanical properties by using NaOH treatments effects of sisal, coir and hemp fibers-reinforced concrete composite are highlighted in this study.
Alkaline pretreatment using sodium hydroxide (NaOH) on oil palm stem eliminates up to 19.8% of lignin content (Ibrahim 2008). The conventional way used to optimise a multifactorial method is to resolve one factor . at a time, but this is time consuming (Rawat et al. 2013, Saliman et al. 2017). Response surface methodology (RSM) has been adopted
Sodium silicate and Sodium hydroxide solution with the ratio of 2.5 .The freshly prepared geopolymer mixes are cohesive and their workability is increased with the increase in the ratio of alkaline solution. Keywords- Flyash, GGBS, Geopolymer concrete, Sodium hydroxide, Sodium silicate, Molarity 1. INTRODUCTION