Abstract
The workability, 28-day compressive strength and free drying shrinkage of a very high strength (121-142 MPa) steel micro fiber reinforced portland cement mortar were studied under a combined influence of fine aggregate content and fiber content. The test results showed that an increase in the fine aggregate content resulted in decreases in the workability, 28-day compressive strength and drying shrinkage of mortar at a fixed fiber content. An increase in the fiber content resulted in decreases in the workability and drying shrinkage of mortar, but an increase in the 28-day compressive strength of mortar at a fixed fine aggregate content. The modified Gardner model most accurately predicted the drying shrinkage development of the high strength mortars, followed by the Ross model and the ACI 209R-92 model. The Gardner model gave the least accurate prediction for it was developed based on a database of normal strength concrete.
Highlights
Steel fiber reinforced high strength portland cement mortar has been used to develop ultrahigh performance concrete in the previous literature [1,2,3,4,5,6,7]
The mortars M11, M21 and M31 visually exhibited severe segregation of steel micro fiber (SMF), as the cement mortar spread into a circular shape quickly, while the SMF clumped at the center part of this circular shape during the workability test
The results presented in this study contributed to the existing knowledge of concrete by focusing on the combined influence of sand content and fiber content on the properties of high strength mortar
Summary
Steel fiber reinforced high strength portland cement mortar has been used to develop ultrahigh performance concrete in the previous literature [1,2,3,4,5,6,7]. High strength portland cement mortar with good workability, high compressive and tensile strength, and durability can be produced using low water-cementitious materials ratio, high quality fine aggregate/sand, steel reinforcing fiber and high range water reducing admixtures (HRWRA). As it is known, cementitious mixtures have the tendency to shrink [8,9,10,11]. The present study was conducted to investigate the combined effect of the sand content and the steel micro fiber (SMF) content on the workability, 28-day compressive strength and free drying shrinkage development (up to 147 days) of high strength cement mortar. Prediction models for the free drying shrinkage development of high strength mortar were developed and compared with several frequently used models including the Ross model, the Gardner model, and the ACI 209R model [26,27,28,29]
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