Abstract
It is well known that supplementary cementitious materials (SCMs) have obvious effects on the properties of concrete. In order to understand the relationship between cementitious materials and properties of ultrahigh strength concrete (UHSC), the cementitious compositions of UHSC were designed by the simple-centroid design method. The effects of cementitious compositions on the properties of UHSC were investigated. It was found that the incorporation of silica fume (SF) improved the flowability and strength of UHSC, but it decreased the time of acceleration period, calcium hydroxide (CH) content, and porosity of UHSC at a certain content. The incorporation of fly ash (FA) increased the flowability, time of acceleration period, and porosity of UHSC, but it decreased the strength and CH content of UHSC. The relationships between cement, silica fume, and fly ash and the properties of UHSC were calculated based on the simple-centroid design method.
Highlights
Introduction e compressive strength ofultrahigh strength concrete (UHSC) ranges from 120 MPa to 810 MPa, which is approximately 2–16 times than that of ordinary concrete. e durability of UHSC is superior that it prolongs the service life and reduces the maintenance of concrete structure
In order to establish the relationship between cement, silica fume, and fly ash and the properties of UHSC, the effects of cementitious materials on the properties of UHSC were investigated. e conclusion could be drawn as follows
E incorporation of silica fume improved the flowability of UHSC when its content was less than 15%, and it reduced the flowability of UHSC
Summary
Introduction e compressive strength ofUHSC ranges from 120 MPa to 810 MPa, which is approximately 2–16 times than that of ordinary concrete. e durability of UHSC is superior that it prolongs the service life and reduces the maintenance of concrete structure. E durability of UHSC is superior that it prolongs the service life and reduces the maintenance of concrete structure. An increase of Al2O3 and SiO2 from SCMs had both a positive and negative effect on the zeta potential of concrete, respectively [8]. To improve the properties or reduce the cost of UHSC, it is a common technical method to incorporate SCMs into cementitious materials. It is reported [10] that the porosity of UHSC with 5–20% of metakaolin was similar to the UHSC without metakaolin. The incorporation of lead-zinc tailings reduced the compressive strength, it remarkably
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