Predicting the drying shrinkage behavior of high strength portland cement mortar under the combined influence of fine aggregate and steel micro fiber

• Published in: Materiales de construcción (Madrid) 2017-04, Vol.67 (326), p.119-e119
• Main Author: Li, Zhengqi
• Format: Article
• Language: English
• Subjects: Aggregate industry; Aggregates; Cement; Cement reinforcements; Compressive strength; Concrete; Crack propagation; Density; Drying; drying shrinkage; Fiber reinforced materials; High strength; Humidity; Investigations; Mathematical models; mortar; Mortars (material); portland cement; Portland cements; prediction; Predictions; Reinforced concrete; Sand & gravel; Shrinkage; Steel fiber reinforced concretes; steel micro fiber; Tensile strength; Workability
• ISSN: 0465-2746; 1988-3226
• DOI: 10.3989/mc.2017.05916

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.