scholarly journals Saturation Point of Superplasticizers Determined by Rheological Tests for Self Compacting Concrete

2017 ◽  
Author(s):  
Mehena Oualit ◽  
Amar Irekti ◽  
Yannick Melinge
Keyword(s):  
Experimental Research ◽  
Coaxial Cylinder ◽  
Mix Design ◽  
Saturation Point ◽  
Self Compacting Concrete ◽  
Mix Proportioning ◽  
Concrete Mix ◽  
Final Adjustment ◽  
Definition Of

The dosage of superplasticizer is first determined in mortar mixtures and it is after adjusted in concrete mix trials. Other self compacting concrete (SCC) mix proportioning methods rely on the definition of the superplasticizer saturation dosage in pastes. These approaches to mix design have advantages over the ones based exclusively on concrete batching because it is less expensive and material demanding to perform tests in mortar and paste than in concrete. This paper presents the results of an experimental research carried out to investigate the use of tests performed in paste to define the optimum dosage of superplasticizer for self-compacting concrete. The materials employed were Portland cement, pozzolana and three types of superplasticizers: poly naphthalene sulfonate (PNS), poly melamine sulfonate (PMS) and a polycarboxylate. The saturation point of each superplasticizer was determined in pastes by rheological tests using a coaxial cylinder rheometer AR2000. Self-compacting concretes were prepared using the superplasticizer contents found. The results obtained led to the conclusion that in SCC mixture proportioning methods, the determination of the superplasticizer content in the paste phase is paramount. Nevertheless, final adjustment of w/c+f ratio was always needed in order to produce SCC.

scholarly journals PREDICTION OF CONCRETE MIX DESIGN USING DATA MINING TECHNIQUES - A REVIEW

2021 ◽  
Vol 9 (5) ◽  
pp. 324-330
Author(s):  
Rajeeth T.J. ◽  
◽  
Pavan Kumar S.P. ◽  
Swathi B. H. ◽  
◽  
...  
Keyword(s):  
Data Mining ◽  
Mix Design ◽  
Machine Learning Techniques ◽  
Concrete Mix Design ◽  
Mix Proportioning ◽  
Concrete Mix ◽  
Technical Specifications ◽  
Precautionary Measures ◽  
The Right ◽  
Codal Provisions

Concrete mix proportioning is one of the critical process and it involves a lot of precautionary measures to arrive at the right proportions of ingredients like cement, aggregate, water, and admixtures. Even though there are technical specifications that are managed mix proportionating, the procedure is not totally in the realm of science. Due to imprecise codal provisions, impreciseness, and fuzziness involved in the various stages of mix proportioning. This paper reviews the various data mining and machine learning techniques developed by the researchers for making concrete mix design for various codal provisions more realistic and scientific.

Definition of rheological characteristics of self-compacting concretes in Russian and foreign regulatory documents

2019 ◽  
pp. 39-45
Keyword(s):  
Water Content ◽  
The Self ◽  
National Standard ◽  
Rheological Characteristics ◽  
Use Of Self ◽  
Self Compacting Concrete ◽  
Regulatory Documents ◽  
Regulatory Frameworks ◽  
Concrete Mix ◽  
Definition Of

The article is devoted to the comparison of acting domestic and foreign regulatory frameworks for assessing properties of the self-compacting concrete. Advantages of the self-compacting concrete mix such as improved flowability and high density at low water content due to what this material has been widely used abroad are presented. In addition, the main rheological characteristics of self-compacting concretes concerning the mobility of the mix, viscosity and segregation, as well as methods for their evaluation with the use of a cone flow diameter, V-shaped funnel, L-shaped box, blocking J-ring are considered. Visual indexes of stability and possibilities of their use are shown. It is noted that when producing concretes it is necessary to provide for possible shrinkage by compensating it due to the use of self-stressing concretes, self-stressing cements and expanding additives, especially when using self-compacting concretes, which exclude forced compaction (vibration). The article reveals the need to develop the national standard and its harmonization with foreign analogs and modification of the Sets of rules existing in Russia.

scholarly journals Determination of the Optimum Amount of Superplasticizer Additive for Self-Compacting Concrete

2020 ◽  
Vol 10 (9) ◽  
pp. 3096 ◽  
Author(s):  
Jose A. Sainz-Aja ◽  
Isidro A. Carrascal ◽  
Juan A. Polanco ◽  
Israel Sosa ◽  
Carlos Thomas ◽  
...  
Keyword(s):  
Power Consumption ◽  
Saturation Point ◽  
Self Compacting Concrete ◽  
Optimum Amount ◽  
Concrete Mixer

Self-compacting concrete modifies its workability with small variations in the amount of superplasticizer additive. For this reason, large number of tests are required to monitor its workability. In order to determine the appropriate amount of additive for a single mix, the evolution of the power consumption of the concrete mixer during the addition of small amounts of additive to the concrete was analyzed. These results were compared both with typical workability characterization for self-compacting concrete and with the saturation point results, determined by the Marsh cone method. After this comparison, a good correlation was obtained between the results from the traditional tests and the proposed “concrete mixer method”.

scholarly journals Mix proportioning of M80 grade Self-Compacting Concrete based on Nan Su Mix design method principles

2018 ◽  
Vol 7 (3.35) ◽  
pp. 52
Author(s):  
S Shrihari ◽  
M V Seshagiri Rao ◽  
V Srinivasa Reddy ◽  
Venkat Sai
Keyword(s):  
Fly Ash ◽  
High Performance ◽  
Design Method ◽  
High Strength ◽  
Mix Design ◽  
Fine Aggregate ◽  
Self Compacting Concrete ◽  
Mix Proportioning ◽  
Major Factors ◽  
Powder Content

The quest for the development of high strength and high performance concretes has increased considerably in recent times because of the demands from the construction industry. High-performance concretes can be produced at lower water/powder ratios by incorporating these supplementary materials. Fly ash addition proves most economical among these choices, even though addition of fly ash may lead to slower concrete hardening. However, when high strength is desired, use of silica fume is more useful. This paper proposes a mix proportions for M80 grade Self-compacting concrete (SCC) based on Nan Su mix design principles. First, the amount of aggregates required is determined, and the paste of binders is then filled into the voids of aggregates to ensure that the concrete thus obtained has flowability, self-compacting ability and other desired SCC properties. The amount of aggregates, binders and mixing water, as well as type and dosage of superplasticizer (SP) to be used are the major factors influencing the properties of SCC. Slump flow, V-funnel, L-flow, U-box and compressive strength tests were carried out to examine the performance of SCC, and the results indicate that the Nan Su method could produce successfully SCC of high strength. Based on Nan Su mix design method, material quantities such as powder content ( Cement + Pozzolan ), fine aggregate, coarse aggregate, water and dosages of SP and VMA,  required for 1 cu.m,  are evaluated for High strength grade (M80) of Self Compacting Concrete (SCC) are estimated. Final quantities, of M80 grade SCC mix, is assumed after several trial mixes on material quantities computed using Nan Su mix design method subjected to satisfaction of EFNARC flow properties. 

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