Abrasion Resistance of High Strength Concrete With Chemical and Mineral admixtures


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Title: Abrasion Resistance of High Strength Concrete With Chemical and Mineral admixtures

Author(s): I. R. De Almeida

Publication: Special Publication

Volume: 145


Appears on pages(s): 1099-1114

Keywords: abrasion resistance; cement pastes; chemical admixtures; compressive strength; fly ash; high-strength concretes; mineral admixtures; porosity; silica fume; superplasticizers; water-cement ratio; Materials Research

Date: 5/1/1994

Abrasion resistance of 10 concrete mixes with compressive strength ranging from 0.24 to 0.42 MPa was evaluated. Mixes studied contained silica fume, fly ash or natural pozzolan, and addition of superplasticizer in some cases to reduce mixing water. Concrete workability remained constant. Tests were carried out following a Portuguese standard similar to a Brazilian standard and German Standard DIN 52108, using the Dorry apparatus. Porosity and compressive strength of concrete were also determined. The main conclusions are as follows: 1) cement replacement by mineral admixtures always reduced the abrasion resistance at rates between 10 and 25 percent, while less satisfactory results were obtained with condensed silica fume concretes; 2) addition of superplasticizer increased the abrasion resistance about 25 percent; 3) abrasion resistance varied inversely with water-cement ratio, cement paste volume, and concrete porosity; 4) general correlation was poor between abrasion resistance and compressive strength, indicating a strong influence from cementing material type, mainly in the case of silica fume; 5) there was evidence that poor performance of condensed silica fume concrete can be ascribed to self-desiccation; 6) even the worst results obtained in this test series were equivalent to abrasion resistance at least six times higher than that of ordinary concrete with 20 MPa compressive strength.