effect of addition time of a superplasticizer on cement

specializing in the production of large, medium and small concrete mixers, concrete mixing stations, stabilized soil mixing stations and other equipment. It is a heavy industry enterprise integrating R & production and sales.

Effect of addition time of a superplasticizer on cement ...

Dec 01, 1999  Effect of addition time on slump of concrete (W/C=0.30). 5. Conclusion. The influence of addition time of an SNF superplasticizer on the adsorption behavior of type I Portland cement and on the concrete workability was studied. It was found that the adsorption behavior of SNF on cement particles follows the Langmuir isothermal adsorption model.

Get PriceEmail Inquiry

EFFECT OF ADDITION TIME OF A SUPERPLASTICIZER ON

The effect of addition time of a naphthalene-based superplasticizer (SNF) on the adsorption behavior on type I Portland cement slurries and on the concrete workability was studied. Test results indicate that the adsorption behavior of SNF on cement particles follows a Langmuir isothermal adsorption model.

Get PriceEmail Inquiry

Effect of delaying addition time of SMF superplasticizer ...

Oct 01, 2012  As the delaying time increases up to 15.0 min the total chloride decreases due to improve the superplasticizing effect with delayed addition time of superplasticizer as well as hinders the penetration of chloride ions into the available pores of cement pastes. The presence of superplasticizer with delaying addition time, increases the ...

Get PriceEmail Inquiry

Effect of addition of Sikament-R superplasticizer on the ...

Aug 01, 2012  The effect of addition of Sikament-R superplasticizer (modified lignosulphonate base) on the hydration characteristics of hardened Portland cement pastes were studied at different curing conditions. Four mixtures were prepared using 0, 0.2, 0.4 and 0.6 wt% addition of Sikament-R superplasticizer (SR) of cement.

Get PriceEmail Inquiry

Influence of cement ageing and addition time on the ...

This increase in fl ow, reduction of yield stress, reduction of adsorbed mass of superplasticizer and increased hydration time with delayed addition is more pronounced with PNS superplasticizers ...

Get PriceEmail Inquiry

(PDF) Influence of superplasticizer on strength of concrete

Superpla sticizer (SP) is important to enhance the w orkability and. setting time of concrete under hot weather, hence, an experimental investigation was conducted to determine the effect of ...

Get PriceEmail Inquiry

INFLUENCE OF DELAYING ADDITION TIME OF

Figure 3 shows the effect of delayed addition (15 min) of the superplasticizers on the minislump of cement pastes with time. The spread area of minislump is large in the case of delaying addition time than simul-taneous addition time. In the delayed addition, the

Get PriceEmail Inquiry

Effects of Superplasticizing Admixture on Properties of ...

This paper was conducted to study the effect of superplasticizer on properties of concrete with characteristic strength of 30 N/mm2. The properties investigated were workability (Slump), and compressive: From the results of the study the workability of concrete can be increased by addition of superplasticizer. However,

Get PriceEmail Inquiry

A Contractor’s Guide to Superplasticizers

and their effect on set time does not affect finishing opera t i o n s , but can change the timing of finishing. Slump Loss Su p e r p l a s t i c i z ers normally in-c rease concrete slump for 30 to 45 m i n u t e s , depending on brand and dosage ra t e . This usually gives the c o n t r actor enough time to place and finish the concre t e ...

Get PriceEmail Inquiry

EFFECT OF ADDITION TIME OF A SUPERPLASTICIZER ON CEMENT ...

The effect of addition time of a naphthalene-based superplasticizer (SNF) on the adsorption behavior on type I Portland cement slurries and on the concrete workability was studied. Test results indicate that the adsorption behavior of SNF on cement particles follows a Langmuir isothermal adsorption model.

Get PriceEmail Inquiry

Effect of Addition Time of a Superplasticizer on Cement ...

年度: 1999: 全部許貫中: 論文名稱: Effect of Addition Time of a Superplasticizer on Cement Adsorption and on Concrete Workability: 期刊名稱

Get PriceEmail Inquiry

INFLUENCE OF DELAYING ADDITION TIME OF

Figure 3 shows the effect of delayed addition (15 min) of the superplasticizers on the minislump of cement pastes with time. The spread area of minislump is large in the case of delaying addition time than simul-taneous addition time. In the delayed addition, the

Get PriceEmail Inquiry

(PDF) Influence of superplasticizer on strength of concrete

Superpla sticizer (SP) is important to enhance the w orkability and. setting time of concrete under hot weather, hence, an experimental investigation was conducted to determine the effect of ...

Get PriceEmail Inquiry

CBD-203. Superplasticizers in Concrete - NRC-IRC

The fluidizing effect achieved by the addition of 0.3 per cent superplasticizer to cement formed at a water: cement ratio of 0.3 is illustrated in Figure 1a, Figure 1b, Figure 1c, Figure 1d. Without admixture (Figure 1a) the cement paste does not flow, but with the superplasticizer it

Get PriceEmail Inquiry

Superplasticizer: Types, Advantages Disadvantages

Disadvantages of Superplasticizer: 1. Slump loss are greater than conventional concrete. 2. Addition cost for admixture. 3. They increase air entrainment in concrete. Uses of Superplasticizer: Superplasticizers disperses cement provides plastics with higher initial strength than free concrete with the same W/C ratio.

Get PriceEmail Inquiry

Effects of nanosilica addition on workability and ...

Oct 01, 2012  The effect of superplasticizer addition on the strength development was evaluated through R c measurements on additional pastes of OPC and OPC–3.8%NS ... at least up to the ultimate curing time investigated (60 ... to be attributed mostly to the accelerating effect of superplasticizer on cement hardening.

Get PriceEmail Inquiry

Effects of fillers on the properties of cement grouts ...

Filler incorporated mixes at low water-cement ratios were not workable. Hence, the workability had to be achieved by addition of chemical admixture, i.e., superplasticizer. In this study, polycarboxylate ether based superplasticizer is added during the mixing process.

Get PriceEmail Inquiry

Use of Superplasticizers and Its Effect

Use of Superplasticizers and Its Effect. Concrete Early Strength. The reduction of w/cm by 20 to 25 % enhances concrete early strength by 50 to 75 % as shown in figure below: Figure 1 Influence of the addition of superplasticizers on the early strength of concrete with cement content of 370 kg/m 3 and cast in room temperature (Neville, 1995).

Get PriceEmail Inquiry

Effect of Naphthalene-Based Superplasticizer and ...

In order to study what the effect of superplasticizers on the setting time, fluidity and compressive strength of calcium sulfoaluminate cement (CSA) a naphthalene-based superplasticizer (BNS) and a polycarboxylic acid superplasticizer (PC) were selected to

Get PriceEmail Inquiry

EFFECT OF DELAYING ADDITION TIME OF SMF SUPERPLASTICIZER

The optimum delaying time of superplasticizer was 7.5 min which gives the highest fluidity, bulk density, compressive strength and chemically combined water contents of cement pastes, whereas, the delaying addition time of 15.0 min shows the lower values of bulk

Get PriceEmail Inquiry

Effect of Delaying Addition of Heat Stimulated ...

Some researchers investigated the effect of delaying the addition time of superplasticizer to mortar or concrete, but there is not enough data about the effect of external temperature on performance of superplasticizers and consequent influences on fresh properties of mortar or concrete. In this research the effect of delaying the addition time ...

Get PriceEmail Inquiry

Nanomodification of Lightweight Fiber Reinforced Concrete ...

Nov 30, 2021  A hypothesis was put forward that a nano-modifying additive of micro silica, which had a beneficial effect on achieving a perfect structure of heavy concrete, can also be effectively used in lightweight fiber-reinforced concrete. The nano-modifying additives of micro silica application in manufacturing lightweight fiber reinforced concrete products and structures can significantly enchain ...

Get PriceEmail Inquiry

The effects of seawater on the hydration, microstructure ...

Mar 04, 2019  This contribution investigates the effects of seawater and colloidal silica (NS) in the amounts of 1, 3 and 5 wt%, respectively, on the hydration, strength development and microstructural properties of Portland cement pastes. The data reveal that seawater has an accelerating effect on cement hydration and thus a significant contribution to early strength development was observed. The ...

Get PriceEmail Inquiry

Effect of addition time of a superplasticizer on cement ...

The effect of addition time of a naphthalene-based superplasticizer (SNF) on the adsorption behavior on type I Portland cement slurries and on the concrete workability was studied. Test results indicate that the adsorption behavior of SNF on cement particles follows a Langmuir isothermal adsorption model.

Get PriceEmail Inquiry

Effect of Addition Time of a Superplasticizer on Cement ...

年度: 1999: 全部許貫中: 論文名稱: Effect of Addition Time of a Superplasticizer on Cement Adsorption and on Concrete Workability: 期刊名稱

Get PriceEmail Inquiry

Influence of time addition of superplasticizers on the ...

Aug 01, 2003  OSTI.GOV Journal Article: Influence of time addition of superplasticizers on the rheological properties of fresh cement pastes

Get PriceEmail Inquiry

Effect of delaying addition time of SMF superplasticizer ...

The effect of addition time of a naphthalene-based superplasticizer (SNF) on the adsorption behavior on type I Portland cement slurries and on the concrete workability was studied.

Get PriceEmail Inquiry

Effect of addition of Sikament-R superplasticizer on the ...

Abstract The effect of addition of Sikament-R superplasticizer (modified lignosulphonate base) on the hydration characteristics of hardened Portland cement pastes were studied at different curing conditions. Four mixtures were prepared using 0, 0.2, 0.4 and 0.6 wt%

Get PriceEmail Inquiry

EFFECT OF DELAYING ADDITION TIME OF SMF

the addition time of superplasticizer (optimum addition time) corresponds to the beginning of the dormant period of the hydration of cement without admixture. The influence of delaying addition time of sulphonated melamine and melamine-urea formaldehyde-free on the properties of cement pastes after 30, 60, 90 and 120 minutes was investigated [3].

Get PriceEmail Inquiry

Use of Superplasticizers and Its Effect

Use of Superplasticizers and Its Effect. Concrete Early Strength. The reduction of w/cm by 20 to 25 % enhances concrete early strength by 50 to 75 % as shown in figure below: Figure 1 Influence of the addition of superplasticizers on the early strength of concrete with cement content of 370 kg/m 3 and cast in room temperature (Neville, 1995).

Get PriceEmail Inquiry

Effect of superplasticizer on performance of concrete

Aug 21, 2017  11. Advantages Of Superplasticizer • Reduce Machine Wear • Better Surface Texture • Improve Strength In Less Time • Reduce Absorption • Eliminate Fine Cracks. 12. Disadvantages Of Superplasticizer • High Cost • Brief Action • Need Strong, Sealed Forms. 13. Effect on Fresh Concrete. 14. Effect on Hardened Concrete.

Get PriceEmail Inquiry

ADDITION OF SUPERPLASTICIZER ON GEOPOLYMER

adjust the time settings. The addition of high-range water-reducing admixture, up to approximately 2% of fly-ash mass, improved the workability of fresh geopolymer concrete with very little effect on the compressive strength of hardened concrete [3]. In this study the mixtures of geopolymer binder were made of fly-ash and alkali

Get PriceEmail Inquiry

Effects of fillers on the properties of cement grouts ...

Filler incorporated mixes at low water-cement ratios were not workable. Hence, the workability had to be achieved by addition of chemical admixture, i.e., superplasticizer. In this study, polycarboxylate ether based superplasticizer is added during the mixing process.

Get PriceEmail Inquiry

(PDF) Influence of mixing time and superplasticizer dosage ...

Water reducing agent, particularly superplasticizer, can change the structure of cement paste in fresh concrete, and enables concrete to be plasticized. [5] [6] [7] Before addition of water ...

Get PriceEmail Inquiry

Effects of nanosilica addition on workability and ...

Oct 01, 2012  The effect of superplasticizer addition on the strength development was evaluated through R c measurements on additional pastes of OPC and OPC–3.8%NS ... at least up to the ultimate curing time investigated (60 ... to be attributed mostly to the accelerating effect of superplasticizer on cement hardening.

Get PriceEmail Inquiry

Effect of Super plasticizer for Improvement of Concrete ...

nominal mixes of concrete, the Glenium 140 have shown however more pronounced in terms of increase in the compressive strength, workability, water reduction, cement saving requirements of concretes. From the results of the study the workability of concrete can be increased by addition of superplasticizer. However, very high

Get PriceEmail Inquiry

EFFECT OF DELAYING ADDITION TIME OF SMF SUPERPLASTICIZER

The optimum delaying time of superplasticizer was 7.5 min which gives the highest fluidity, bulk density, compressive strength and chemically combined water contents of cement pastes, whereas, the delaying addition time of 15.0 min shows the lower values of bulk

Get PriceEmail Inquiry