Topic
Mortar
About: Mortar is a research topic. Over the lifetime, 25024 publications have been published within this topic receiving 218739 citations.
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TL;DR: In this paper, the compressive strength development of chemically activated high phosphorous slag content cements at different Blaine finenesses has been investigated, showing that increasing fineness results in significant reductions in the amount of water absorption and the total open pore volume of mortar specimens.
61 citations
TL;DR: In this paper, the effect of chemical and mineral admixtures, including superplasticizer, viscosity modifying agent (VMA), limestone powder and fly ash in different W/C on fluidity, visco-ciality, and stability of self-consolidating mortar is investigated and proper workability regions for the prepared mixtures are presented.
61 citations
TL;DR: In this article, the effect of nano-CuO (NC) and rice husk ash (RHA) on the performance and properties improvements on RHA-containing mortar specimens were determined with the addition of NC.
Abstract: This paper presents an experimental study on a new mixture scheme of mortar. Unlike most of existing work, the present study investigates nano-CuO (NC), and its combined effects with cement replacement i.e., rice husk ash (RHA) on durability performance, as well as strength and permeability properties of mortars. Comprehensive observations of both the performance and properties improvements on RHA-containing mortar specimens were determined with the addition of NC. To this end, a series of tests for examining the strength both directly (compressive strength) and indirectly (Ultrasonic Pulse Velocity), electrical resistivity, chloride permeability, water absorption and microstructure characteristics (i.e., SEM micrographs, Mercury intrusion porosimetry (MIP) & capillary analyses) of mortar specimens were performed. A relationship between the Rapid chloride permeability test (RCPT) and electrical resistivity was also studied in order to recommend an alternative method for quality control in the presence of RHA and NC. Finally, a mixture scheme which provides relatively satisfactory properties improvement with positive environment credential is suggested.
61 citations
TL;DR: In this paper, two types of composite expansion agents, CSAE (calcium sulphoaluminate type expansion agent) and CE (CaO) were used to improve the drying shrinkage of AAS (alkali activated slag) system, separately.
61 citations
TL;DR: In this paper, the role of porosity in the resistance of concrete and mortar to external sulphate attack was evaluated and it was shown that porosity could also have a positive effect on durability by generating additional space to accommodate the expansive phases.
Abstract: Design codes promote a limitation of permeability (indirectly of porosity) to reduce the sulphate ingress and improve the resistance of concrete and mortar to external sulphate attack (ESA). However, porosity could also have a positive effect on durability by generating additional space to accommodate the expansive phases. The aim of this study is to evaluate the role of porosity in ESA. For that, changes at the macro-scale, phase composition and pore network are monitored for mortar compositions with different pore-size distribution. Results indicate the existence of two mechanisms: the capacity to accommodate expansive phases controls the durability during the initial stages of the attack, while at later stages durability is defined by the permeability. Results from specimens with air-entrainer suggest that the intentional increase of porosity towards maximising the capacity to accommodate expansive products might be a valid approach in order to reduce the expansive forces generated during ESA.
60 citations