Conclusions: Polycarboxylate superplasticizer at the suitable concentrations (1.8% and 2.4%) and experimental liquid-to-powder ratios affected both in setting time and flow characteristic of ...

The longer the emptying time is, the weaker the fluidity of the paste is, so the apparent viscosity is larger. In the test, the initial emptying time of the cement paste was marked as T in and the emptying time of the paste at 120 min was marked as T 120. The results were shown in Table 4. It can be seen that PCE-ACL1 has the best viscosity ...

Polycarboxylate (PCE) superplasticizers play a crucial role in preventing cement coagulation by effectively adsorbing onto the surface of cement particles, enhancing dispersibility, and maintaining dispersion performance. This study delves into the potential interaction mechanisms between PCE superplasticizers and cement particles, focusing …

Make sure all materials are well-blended before adding the polycarboxylate superplasticizer. When it comes time to add the superplasticizer, pour it slowly into the mixture while maintaining constant agitation. This ensures proper dispersion and avoids clumping or uneven distribution within the concrete matrix.

superplasticizer will prolong the time of set of concrete as more water is available to lubricate the mix [3]. In the case of hardened concrete the use of superplasticizer will increase

The result showed the performances of PCM-β-CD closed to the control polycarboxylate superplasticizer (PCs) used in this study, especially the fluidity loss is smaller and the setting time is ...

dosages of superplasticizer (Sikament-NN superplasticizer of the weight of cementitious material) on the characteristics of concrete with and without superplasticizer. 3.1 Effect of Superplasticizer with Reduced Water–Cement Ratio on Workability . The results for slump and flow of superplasticizer concrete are shown in Table 4.

Fig. 6 shows the variation in the initial setting time and final setting time for the TW-CPB samples with the addition of 0.5 %, 1.0 %, 1.5 %, 2.0 %, and 2.5 % of four kinds of superplasticizers. The initial setting time of the samples without adding a superplasticizer is 316 min, and the final setting time is 1412 min.

3.4 Setting time. The initial setting time of UHPC in the state of constant W/B ratio and minimum W/B ratio versus the SP dosage is illustrated in Figure 10. It can be clearly observed that specimens with a constant W/B ratio suffer a relatively longer setting time compared with that of UHPC with the lowest W/B ratio.

Download scientific diagram | The effect of superplasticizer on the setting time of SM from publication: Feasibility of Utilize Sidoarjo Mud as Replacement Material in Fly Ash Based Geopolymer ...

In this study, a ultra-early strength type polycarboxylate superplasticizer (ES) was synthesized successfully by a design molecule structure such as introducting ultra long polyoxyethlene side chains, …

The initial setting time of the samples without adding a superplasticizer is 316 min, and the final setting time is 1412 min. With the addition of 0.5 % PC-P …

Setting time tests were carried out on an automatic Vicat Needle device model AUTO-VICAT from the company Ibertest. It consists of a periodic introduction of a standard needle into a cementitious material and, analysing its specific resistance to penetration, the initial and final times of the setting period are determined according to …

cementation consistency mixing time is 15 seconds. Base consistency may take 5 to 10 seconds longer. 3.3 Finishing 1. Excess material may be removed at once or after completion of setting time (see 3.2 Dosage and mixing). Do not touch the cement when it is in the intermediate, rubbery condition.

Superplasticizer is a common additive for grouting materials, and its main function is to provide enough fluidity [16,21,53,58,63].Precisely speaking, it is the superplasticizer adsorption that plays a key role in influencing the flowability of grouts. A model has been proposed by Y. Fang et al. [59] to explain its significant effect on decreasing the flow time.

As the addition of BNS increased from 0.8 wt% to 2.0 wt%, the initial setting time was prolonged 10 min, the final setting time was prolonged 7 min, the 5 min fluidity was improved from no ...

The incompatibility between the superplasticizer (SP) and cement can cause problems with the cementitious materials' fresh and hardened qualities, such as unstable workability, uncontrollable setting times, excessive air entrainment, and so on. In this paper, five various types of SPs were prepared.

ylate superplasticizer was 32% and 20% respectively. Three AEAs named SJ, SD, and DC were used in the study. The chemical structure schematic diagrams ... Setting time/min Compressive strength/MPa Initial Final 3 d 28 d 3.15 345 142 202 27.2 48.7 Table 3 Concrete mix proportions Group Cement /(kg/m3) Sand /(kg/m 3) Gravel

The results from the flowability testing are shown in Figure 1.The mean flows of AWPC plus 1.8% and 2.4% polycarboxylate superplasticizer groups were significantly increased (p < 0.001) at all liquid-to-powder ratios when compared with control groups.Significant differences between AWPC plus 1.2% polycarboxylate …

Investigating the effect of polycarboxylate-ether based superplasticizer on the microstructure of cement paste during the setting process. Author links open overlay panel Weiwei Zhu a b, Qingge Feng a c, Qi Luo d, Jun Yan e, Chun Lu b. ... The setting time for each mix was determined as per Chinese standard GB1346-89.

Curiously, for mixtures 1 and 2, although the statistical significance is low, it seems that the yield stress increase with time, with procedure 1, is faster with the 10 min resting time, compared to the 30 and 50 min resting time (Fig. 12). Mixtures 3 and 4 do not clearly show this effect.

In view of the problems existed in water reducing agent and the request of setting time for Large-scale projects and according to the study on modification of LK poly carboxylic acid water reducing agent, super-retarding poly carboxylic acid water reducing agent LKS was successfully developed, which has high water reducing rate, good slump …

A novel monovinyl β-cyclodextrin monomer (β-P) is employed to synthesize polycarboxylate superplasticizers with β-cyclodextrin (β-CD) grafted on the end of side chain [PAA-g-(β-P) n HPEG, n is the mass ratio of β-P in macromonomer, n = 3% ~ 9%]. β-P is synthesized through grafting β-CD on the polyoxyethylene (PEO) via click reaction, …

The molecular-scale structural changes in polycarboxylic superplasticizer (PCE) can influence dispersion and water retention. Polycarboxylate superplasticizer, synthesized using different methods, …

Polycarboxylate superplasticizer (PCE) was synthesized by unsaturated monomers of carboxylic acid, alkane macromonomers of long chains, and others. It was an excellent cement dispersant which would …

Specially, polycarboxylate superplasticizer (PCE) has been widely applied due to its relatively low doping amount, high water reducing rate and environmental friendliness property. In this review, the properties of PCE were systematically …

We can see fro m Fi gu re 3, Th e ne t cement flow rate of polycarbo xylate superplasticizer decr eases gradu ally w ith th e incr ease of AMPS dosage, and the n et cem ent flow rate of PE-06 is ...

In our study, we found that the setting times of the experimental groups varied from 4.2 to 11.3 minutes and 2.6 to 4.7 minutes according to ISO 6876:2001 and ANSI/ADA Spec No.57, respectively (2.6 minutes is the …

It was observed that when superplasticizer was added at a rate of 0.2 to 0.4% of cement weight, a significant increase in slump was reached of up to [4] times the initial slump.

DOI: 10.1016/J.CONBUILDMAT.2013.10.028 Corpus ID: 136408170; Compatibility between a polycarboxylate superplasticizer and the belite-rich sulfoaluminate cement: Setting time and the hydration properties