Effect of Fiber Addition, Heat Treatment, and Preset Pressure on Mechanical Properties of Ultra-High-Strength Mortars

Abstract

In this study, efforts were undertaken to produce ultra-high-strength mortars (UHSM) from conventionally available materials. Selection of mixtures and optimization of mixtures were achieved by adopting the basic principles of UHSM and through trial studies. A preliminary investigation was carried out to assess the effects of different curing regimes on the strength development of UHSM. Effects of fiber addition, heat treatment, and preset pressure on the rate of strength development of UHSM mixtures were individually assessed to better understand their benefits in the production of UHSM. Mechanical properties of the heat-treated UHSM were then investigated to determine the performance of the UHSM developed from conventional materials. Results from this study suggested that for the production of UHSM, a multiple curing regime was best suited and was then used for further studies. Data on strength development indicated that heat treatment increased the strengths by 57% to 75%. With application of preset pressure, the compressive strengths of UHSM were increased significantly by 15% to 18%. The optimum quantity of fibers to produce UHSM was found to be 2% to 3%. Effectiveness of fibers in increasing the strength of UHSM was found to be higher for heat-cured specimens than for normal water-cured specimens. The maximum target strengths obtained from the UHSM were 194 MPa, 24 MPa, and 31 MPa for compression, split tension, and flexure, respectively. The UHSM also showed improved energy absorption and toughness characteristics, especially at higher-fiber dosages.

An Experimental Model on the Mechanical Properties of Reactive Powder Concrete by using Cement Replacement of Glass Powder

“…Several researchers accomplishes the observations on RPC material in past, conducts the attractive survey on definite materials. Analysts have considered on picking fixings, decision of relieving administration, molecule pressing of blend [3] built up a ultra-high quality pliable cement composed RPC material with essential standards of improving the constituent based on wiping out of the unrefined total, upgrading the micro-structure by pre-set affability treatment, likewise, flexibility and rigidity of cement is expanded by fusing little, large ductile, straight microfibers [4]. Two kinds of cements are produced and assigned as RPC material 200 and RPC material 800.…”

Influence of curing regimes on compressive strength of ultra high performance concrete

“…Table 1 presents various mix proportions for UHPC obtained from available literature to get the most compacted and highest density. Richard & Cheyrezy (1995), Barnett et al (2007), Harish et al (2011Harish et al ( , 2008, Prabhat et al (2012). The density of mixture obtained was in the range of (2460-2520) kg/m 3 .…”

Study of Macro Mechanical Properties of Ultra High Strength Concrete Using Quartz Sand and Silica Fume

“…The work on UHSC in India started from last few years at SERC, Chennai the development of UHPC started with and without fibers and studied the effect of various heats curing regime on strength properties. (Harish K.V et al) [2]. Dili A.S. and Manu Santhanam [3] have studied mix design, mechanical properties and durability aspect of RPC.…”