the solubility of the reaction products of the particular concrete. A lower hydroxide ion concentration generally causes more rapid attack on the concrete surface. ... accelerate chemical attack, better protection is required than for normal temperatures. 3 Effects of Substances on Concrete and Guide to Protective Treatments. Generally there ...
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 …
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 …
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. ...
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.
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
The alkaline solution was the combination of sodium silicate and sodium hydroxide solution with the ratio (Na ₂SiO₃/NaOH) of 1.0, 2.0 and 3.0. The molarity of sodium hydroxide was fixed as 10.
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.
The effect of sodium hydroxide (NaOH) amount on phosphogypsum based cement was investigated. The mechanical performances and hydration mechanism of the phosphogypsum-based cement with different proportions of NaOH and steel slag were analyzed based on setting time, volume stability, strength test, XRD and SEM …
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 …
hydroxide concentration does not much change: as hydroxide concentration from sodium hydroxide increases, that from portlandite decreases, so that the total hydroxide concentration remains broadly constant until the sodium hydroxide concentra-tion exceeds about 10 2 M. Like all buffer systems j the pH buffers in cement have a limited capacity ...
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.
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 …
The experimental results show that, NaOH as an alkali activator significantly reduces the cement setting time and improves the cement early strength. But the …
1. Introduction. When a cement-based material experiences humidity for a long time period, water may penetrate into the material, causing leaching of calcium hydroxide.
A variety of recent studies showed that sodium hydroxide (NaOH) treatment plays a significant role in the adhesion of fiber concrete composites. It was found that NaOH improves the...
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 …
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 …
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 …
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 …
Compared with traditional cement, alkai-activated cementitious materials have higher strength, lower hydration heat, simple manufacturing process and less investment. At the same time, this paper uses recyced cement-based materials, the combination of the two groups also conforms to the principle of green, low energy consumption. In this paper, …
Caustic soda, Lye [Sodium hydroxide], Soda lye, Sodium hydrate Colorless to white, odorless solid (flakes, beads, granular form). CDC - NIOSH Pocket Guide to Chemical Hazards - Sodium hydroxide Skip directly to site content Skip directly to page options Skip directly to A-Z link
Sodium hydroxide Sodium hydroxide (NaOH) is often called caustic soda. This compound has an extremely high pH when dissolved in water. Sodium hypochlorite strength Common hypochlorite sold in stores ( bleach) is 5.25% chlorine since lower concentrations are more stable. Industrial hypochlorite is 12 to 15 trade percent …
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 …
The alkali-activated mortar was prepared using a binary combination of 60% LSP and 40% NP [42].The samples were designated as AANL x (alkali-activated NP/LSP), where × is the molar concentration of NaOH (aq).A total of six AANL x (where × = 4 M, 6 M, 8 M, 10 M, 12 M and 14 M) mixtures were prepared to study the effect of sodium …
The calcium hydroxide required in reaction (6.13) is liberated in the setting of the tri- and di-calcium silicates of the cement, but sodium sulfate does not attack the hydrated silicates themselves to any appreciable extent, since these are more insoluble than the calcium sulfate and alkali silicates which would result. This is demonstrated ...
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 ...
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
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 …
The present study was carried out to investigate the effect of alkali content of cement on the properties of the Portland cement mortar fraction of UHPC. ... The practice of adding reagent grade sodium hydroxide to a reference cement to elevate its alkali level is a commonly employed procedure in standard test methods and research …
The ability to disolve fats and organic material makes sodium hydroxide an excellent paint stripper and de greaser its a lot less unpleasant to use than ammonia, but does require rinsing to remove the sodium hydroxide, wheras ammonia solution just evaporates, although any soaps it formed will remain behind unless rinsed.
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