Lignosulfonate - an overview | ScienceDirect Topics
Lignosulphonates (LSs) were the first dispersants added as water-reducing admixtures to concrete. LSs have been used since the 1930s as plasticizers and water reducers ( Scripture, 1937) and ready-mix concrete represents their largest application.
Production and Application of Lignosulfonates and Sulfonated
In this process, lignosulfonates were reacted at 1:4 weight ratio with concentrated sulfuric acid at 20 °C. 72 The mixture was neutralized with calcium oxide to precipitate calcium sulfate, and filtered to produce soluble calcium lignosulfonates in the filtrate. The product could be dried.
Effects of Ca-, Mg-, K-, and Na-lignosulfonates on the
In concrete production, because of plasticizers are used for a small percentage by weight of cement (in the range from 0.3% to 1.5%), there is a possible risk adding more admixture in concrete
Preparation of concrete superplasticizer by oxidation
The degradation efficiency of sodium lignosulphonate (SLS) pretreated with various concentrations of peracetic acid (PAA) at different temperature was measured to effectively degrade and make use
Sodium lignosulfonate used as plasticizer in concrete
1.Sodium Lignosulfonate uses as superplasticizer dosage of cement content 0.20-0.30%, commonly used dosage is 0.25% water reduction of up to 9-11%. In the appropriate dosage when compared with the reference concrete strength increased by 15-20% 3 days, 7 days strength increased 20-30%, 28 days by 15-20%, long-term strength also increased.
- What is the use of Sodium lignosulfonate as plasticizer in concrete?
- Sodium lignosulfonate used as plasticizer in concrete will reduce the cost by 10-15%,the sodium lignosulfonate could assume 0.5-2% of the total mixture w/w,will increase the strength of concrete by 20-26%. Sodium lignosulfonate uses water reducing agent, By sulfite pulp waste liquid of legal system formed by chemical modification and processing.
- What are lignosulfonate admixtures?
- Lignosulfonate admixtures were intended to adjust workability, strength, and durability properties in concrete. They also improve the uniformity and stability of a concrete mixture for a host of applications.
- Does lignosulfonate nitration affect concrete admixtures?
- The nitration of lignosulfonates also seemed to have an impact on the plasticizing capabilities of concrete admixtures. In one study, nitration to approximately 0.6 wt % allowed for less water to be added to concrete mixtures (45 L less water per m 3 concrete), while the strength properties of the concrete were maintained at 25 mN.
- Why are lignosulfonates used in concrete?
- Dispersants and concrete additives (plasticizers) account for the widest use of lignosulfonates and sulfonated lignin. This is due to their appropriate molecular weight (10 000–50 000 g mol −1) and anionic charge density (0.1–0.9 meq g −1), stemming from the presence of functional groups.
- Why is sodium lignosulphonate a universal additive?
- In addition to versatility, Sodium lignosulphonate’s compatibility with other preparations makes it a universal additive in various combinations. Sodium lignosulphonate is an effective binder of powder and granular materials such as animal feed, fertilizers, and briquettes.
- Can Sodium lignosulfonate water reducing agent be used as liquid?
- Sodium lignosulfonate water reducing agent can be used as liquid. Users can experiment to determine the content and proportion. Using sodium lignosulfonate water reducing agent, Strictly control the content,use less the effect is not obvious,use more affect the early strength of concrete.
