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.

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

Properties of polymer-modified mortars using epoxy and acrylic emulsions

Physical and mechanical properties of styrene–butadiene rubber emulsion modified cement mortars

Disposal of fly ash (FA) resulting from the combustion of coal-fired electric power stations is one of the major environmental challenges. This challenge continues to increase with increasing the amount of FA and decreasing the capacity of landfill space. Therefore, studies have been carried out to re-use high-volumes of fly ash (HVFA) as cement replacement in building materials. This paper presents an overview of the previous studies carried out on the use of high volume Class F FA as a partial replacement of cement in traditional paste/mortar/concrete mixtures based on Portland cement (PC). Fresh properties, mechanical properties, abrasion resistance, thermal properties, drying shrinkage, porosity, water absorption, sorptivity, chemical resistance, carbonation resistance and electrical resistivity of paste/mortar/concrete mixtures containing HVFA (⩾45%) as cement replacement have been reviewed. Furthermore, additives used to improve some properties of HVFA system have been reviewed.

A brief on high-volume Class F fly ash as cement replacement – A guide for Civil Engineer

Influence of polymer on cement hydration in SBR-modified cement pastes

Laboratory and field performance of polymer-modified cement-based repair mortars in cold climates

Basic rheological and mechanical properties of high-volume fly ash grouts

Cracking is one of the most serious problems affecting concrete structures. It is important to repair them to maintain their level of service. In 1987, after experiencing problems during the injection of one of its concrete dams, Hydro-Quebec decided to carry out a research project to investigate the grouting products, equipment and procedures. This thesis is a part of these activities. The topics treated in the first chapter are concrete cracking and its investigation. Then, follows a brief description of concrete repair techniques, including examples of grouting. The next chapter describes the products, equipment and procedures used in concrete grouting. The following chapter is dedicated to laboratory simulation of the injection of concrete structures: previous experimental work is summarized and the procedures of slab injection followed for this study are explained. The experimental results and their analysis are included in the next chapter.

M.S Mirza

Papers

Laboratory and field performance of polymer-modified cement-based repair mortars in cold climates

Basic rheological and mechanical properties of high-volume fly ash grouts

Contribution à l'étude des méthodes d'injection des fissures dans le béton