The Effectiveness of High Quality Supplementary Cementitious Materials for Mitigating ASR Expansion in Concrete with High Alkali Content
Journal Title: Engineering, Technology & Applied Science Research - Year 2015, Vol 5, Issue 5
Abstract
Alkali silica reaction (ASR) is influenced by external factors such as the surrounding environment of high alkalinity. Countries with cold climate have a high probability to be exposed to high concentrations of NaCl solution by the deicing salt. This condition will lead to serious ASR problems in concrete, if the aggregates contain reactive silica. The main research work in this paper is to investigate the effect of 15% replacement ratio of high quality fine fly ash (FA15%) and 42% replacement ratio of blast furnace slag (BFS42%) on the ASR mitigation in concrete with different alkali amount inside the pore solution. The experiments were conducted according to the accelerated mortar bars experiment following the JIS A1146 mortar bar test method. In addition, post-analysis such as observation of ASR gel formation by the Uranyl Acetate Fluorescence Method and observation of thin sections using a Polarizing Microscope were also conducted. The mortar bar tests show a very good mitigation effect of supplementary cementitious materials (SCMs). The results show that only small ASR expansions, which can be categorized as “innocuous”, occurred for specimens with 1.2% Na2Oeq using FA15% and BFS42%. However, larger alkali amount inside the system will require more SCMs amount.
Authors and Affiliations
I. Prasetia
Keywords
Related Articles
- EP ID EP91174
- DOI -
- Views 224
- Downloads 0
Renewable Energy Systems: Development and Perspectives of a Hybrid Solar-Wind System
Considering the intermittent natural energy resources and the seasonal un-balance, a phtovoltaic-wind hybrid electrical power supply system was developed to accommodate remote locations where a conventional grid connecti...
Precise Generators Synchronization a Small HPP with an Excitation System
The main problem in the process of synchronization of small synchronous generators in HPPs is the maintenance of a constant difference in the angular velocities of the generator and the system (sliding). This is necessar...
The Effect of Displacement Mode of Rigid Retaining Walls on Shearing Bands by Active Earth Pressure
This work treats the physical modeling of failure mechanisms by active earth pressure. This last is developed by retaining wall movement. A lot of research showed that wall displacement has a significant effect on active...
An Efficient Adaptive Load Balancing Algorithm for Cloud Computing Under Bursty Workloads
Cloud computing is a recent, emerging technology in the IT industry. It is an evolution of previous models such as grid computing. It enables a wide range of users to access a large sharing pool of resources over the int...
Gas Turbine Engine Starting Applicated on TV2-117 Turboshaft
The paper presents the examination of two different types of engine starting configurations, applicated on TV2-117A turboshaft, running into the test bench. The first type of starting configuration is a normal starting,...