The effect of chemical admixtures and mineral additives on the properties of self-compacting mortars

By M. Şahmaran, H. Christianto, I. Yaman. 2006

355 citations recorded by the source corpus.

Mortar serves as the basis for the workability properties of self-compacting concrete (SCC) and these properties could be assessed by self-compacting mortars (SCM). In fact, assessing the properties of SCM is an integral part of SCC design. The objective of this study was to evaluate the effectiveness of various mineral additives and chemical admixtures in producing SCMs. For this purpose, four mineral additives (fly ash, brick powder, limestone powder, and kaolinite), three superplasticizers (SP), and two viscosity modifying admixtures (VMA) were used. Within the scope of the experimental program, 43 mixtures of SCM were prepared keeping the amount of mixing water and total powder content (portland cement and mineral additives) constant. Workability of the fresh mortar was determined using mini V-funnel and mini slump flow tests. The setting time of the mortars, were also determined. The hardened properties that were determined included ultrasonic pulse velocity and strength determined at 28 and 56 days. It was concluded that among the mineral additives used, fly ash and limestone powder significantly increased the workability of SCMs. On the other hand, especially fly ash significantly increased the setting time of the mortars, which can, however, be eliminated through the use of ternary mixtures, such as mixing fly ash with limestone powder. The two polycarboxyl based SPs yield approximately the same workability and the melamine formaldehyde based SP was not as effective as the other two.

Subfields: Building and Construction, Civil and Structural Engineering

View Paper: https://www.semanticscholar.org/paper/4c4ab199de11e3a36892d7d75014570d7d30758e

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In Building and Construction

1. Abd ElMoaty
2. Gritsada Sua-iam
3. N. Makul
4. Hanifi Çanakçi
5. F. Celik

In Civil and Structural Engineering

1. Gritsada Sua-iam
2. N. Makul
3. Abd ElMoaty
4. P. Dinakar
5. U. Sahoo
6. Hanifi Çanakçi
7. F. Celik
8. Basma S. Mohamed

Citations in the corpus

• Effect of filler types on physical, mechanical and microstructure of self compacting concrete and Flow-able concrete (2014, background): “Moreover, these mineral admixtures can significantly improve the workability of selfcompacting [6,7].”
• An investigation of rheological properties of cement-based grout mixed with rice husk ash (RHA) (2015, background): “An increase in volume of paste reduces the fluidity of the grout mixtures because of an increase on the plasticity and cohesiveness [48–50].”
• Compatibility between polycarboxylate-based admixtures and blended-cement pastes (2013, neutral): “[18], in turn, studied the effect of replacing 15– 30% of cement with fly ash and limestone powder in self-consolidating mortars containing PCEs.”
• Design of self-compacting concrete with ground granulated blast furnace slag (2013, background): “concrete as separate ingredients either before or during mixing [6].”