Identify the potential aggregates transaction around Tabriz and ways to reduce their negative effects on concrete properties
Document Type : Original Article
Authors
1 BHRC Scientific Board Member
2 Expert
Abstract
Since the aggregates generally occupy 60% to 75% of the concrete volume, they strongly influence the concrete’s physical and chemical properties. Aggregate, not only can affect the strength of concrete but also their properties greatly affect the durability and structural behavior of concrete. In fact, aggregates are not entirely neutral and concrete performance is influenced by physical and chemical properties of aggregates. One of the most important problems attributed to aggregate of Tabriz are reported to possibly deleterious alkali silica reaction between the hydroxyl ions (OH−) in the pore solution and reactive silica in the aggregate over the time. So, investigation of alkali-silica reaction potential for aggregate in this area is so invaluable because of high consumption of these suspicious materials in the construction of varied hydraulic structures.
In present research, the Potential of Alkali Reactivity for aggregates correspond to three mines in Tabriz area was investigated by Petrographic Examination (according to ASTM C295) and Mortar Bar Test (according to ASTM C1260). The results clearly show that current aggregates exhibit high reactivity and the use of pozzolanic cement for controlling alkali silica reaction (ASR) was not effective.
In present research, the Potential of Alkali Reactivity for aggregates correspond to three mines in Tabriz area was investigated by Petrographic Examination (according to ASTM C295) and Mortar Bar Test (according to ASTM C1260). The results clearly show that current aggregates exhibit high reactivity and the use of pozzolanic cement for controlling alkali silica reaction (ASR) was not effective.
Keywords
Main Subjects
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Volume 11, Issue 3 - Serial Number 20
September 2017Pages 43-54
- Receive Date: 14 January 2018
- Accept Date: 22 January 2018