Materiales de Construcción, Vol 67, No 326 (2017)

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


https://doi.org/10.3989/mc.2017.05916

Zhengqi Li
Glenn Department of Civil Engineering, Clemson University, United States
orcid http://orcid.org/0000-0002-7675-4525

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.

Keywords


Portland cement; Mortar; Drying shrinkage; Prediction; Steel micro fiber

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References


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