Abstract
Self-compacting repair mortars (SCRM) are particularly desired for the rehabilitation and repair of reinforced concrete structures. The properties of SCRM can be improved by using chemical, mineral, polymer and fiber additives. In limestone quarries, considerable quantities of limestone fine powder are obtained during the process of crushing rock. These fine powders are being collected and their utilization is a big problem from the aspects of disposal, environmental pollution and health hazards. The introduction of limestone powder as cement and sand replacement present interesting possibilities to reduce the cement cost production, CO2 emission and the conservation of natural resources. The effects of limestone powder content in crushed sand on the properties of SCRM are not studied. An experimental study was undertaken to find out the effect of limestone powder content on fresh and hardened properties of SCRM. SCRM mixtures were prepared using crushed sand partially replaced with limestone powder at varying percentages up to 30%. Results indicate that the limestone powder as sand replacement significantly improves the fresh and hardened properties of SCRM with a content ranging from 10 to 15%. The use of limestone powder in repair mortar and concrete application would offer technical, economical and environmental advantages for concrete producers.
Highlights
Self-compacting repair mortars (SCRM) are desired for the rehabilitation and repair of reinforced concrete structures (Courard et al, 2002; Felekoğlu et al, 2006)
The sand to mortar (S/M), the water to cement (W/C) and the superplasticizer to cement (SP/C) ratios were selected by a simple evaluation test for assessing the stress transferability of fresh SCRM as recommended by Edamatsu et al (2003)
The lowest flexural and compressive strength at 28 days was obtained for 30% of crushed sand by weight was replaced by limestone powder
Summary
Self-compacting repair mortars (SCRM) are desired for the rehabilitation and repair of reinforced concrete structures (Courard et al, 2002; Felekoğlu et al, 2006). Producing of self-compacting mortars with the use of chemical additives, decreasing shrinkage and permeability and using mineral additives increased compressive strength (Edamatsu et al, 1999; Khayat and Guizani, 1997; Yurugi et al, 1995; Khayat, 1998; Zhu and Gibbs, 2005; Sonebi and Bartos, 1999) As it is well known, there is a wide range of cementitious mortars based on cement and components similar to those of concrete. Ferraris et al (2001) studied on the effect of addition of fine grounded materials with a comprehensive literature survey They have concluded that the selection of a fine mineral admixture for improved concrete workability is not a trivial problem. The water absorption capacity of SCRM was assessed at age of 28 days
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
