Abstract
Concrete properties such as unit weight and compressive strength are highly dependable on the properties of aggregate. Current research aims to study the effect of aggregate properties on concrete considering the resource of aggregate. The properties of aggregate and fine sand were studied (specific gravity, density, absorption, and abrasion). Also, the properties of concrete were studied (density, unit weight, and compressive strength). Samples of coarse and medium aggregates, and fine sand were collected from different areas in Jordan (Ajloun, Amman, Aqaba, Irbid, Jerash, Karak, Ma’an, Madaba, Salt, Zarqa, and Tafila) to be tested and used in concrete mix. Aggregate from South of Jordan has higher values in specific gravity and bulk density (Aqaba, Ma’an, and Karak aggregates). Also, the same aggregate samples have lower values in absorption and abrasion (Ma’an, Aqaba, Karak, and Tafila). For the properties of concrete that include density, unit weight, and compressive strength, all samples have achieved the design properties and strength in the current study. For density and unit weight, samples from South of Jordan have higher values (Ma’an and Aqaba). And for compressive strength, Ma’an, Irbid and Amman concrete samples have the highest values at 7-day, while the 28-day compressive strength comes highest for Zarqa, Ma’an, Irbid and Amman. From the results of the current study, the compressive strength at 7-day and 28-day is related to the density of coarse and medium aggregate, abrasion, and absorption. The higher the density, the higher the compressive strength. And the lower abrasion and absorption, the higher the compressive strength of concrete. Current research will be useful in selecting the source of aggregate to produce a considerable concrete strength.
Highlights
Production and utilization of concrete are rapidly increasing, which results in increased consumption of natural aggregate as the largest concrete component
It is obvious that the aggregate of Aqaba has the greater unit weight (24.04 kN/m3), Ma’an concrete has (23.18 kN/m3), and Irbid aggregate has (23.13 kN/m3)
2) Aggregate from South area of Jordan has the highest value of specific gravity such as Aqaba, Karak, and Ma’an
Summary
Production and utilization of concrete are rapidly increasing, which results in increased consumption of natural aggregate as the largest concrete component. Two billion tons of aggregate are produced each year in the United States. It is important to understand and describe the properties of the material constituents, the type and proportions to make the required design through the particle packing theory and the excess water/paste layer theories. The packing density models of particles are required in mix design, in addition to the surface area model for particles that based on the particle size distribution curves. Particle density and particle size distribution have great effects on fresh and hardened concrete properties. The concept of particle packing density was introduced first in 1982 to minimize the inter-particle voids between constituents of the concrete to reduce the paste demand, while the particle size distribution was introduced earlier in 1907 and 1930
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