Effect of Nanoclay on the Expansive Potential of Cement Mortar due to Alkali-Silica Reaction

2015 ◽  
Vol 112 (6) ◽  
Author(s):  
Mohammad R. Irshidat ◽  
Mohammed H. Al-Saleh ◽  
Sura Sanad
Keyword(s):  
Cement Mortar ◽  
Alkali Silica Reaction

Using of the Ultrasonic Method for Alkali-Silica Reaction Detection in the Cement Mortar

2021 ◽  
Vol 321 ◽  
pp. 29-35
Author(s):  
Dimitrii Gusak ◽  
Jiří Brožovský ◽  
Rudolf Hela
Keyword(s):  
Internal Structure ◽  
Propagation Velocity ◽  
Cement Mortar ◽  
Ultrasonic Method ◽  
Alkali Silica Reaction ◽  
Extensive Investigation ◽  
Internal Corrosion ◽  
Impulse Propagation ◽  
Structure Changes

The alkali–silica reaction (ASR) causes internal corrosion of concrete. The aim of this work is to verify the possibility of ultrasonic method in detection of concrete internal structure changes, which were initiated by the alkali-silica reaction. For this purpose, we prepared samples that contained aggregates of two types, namely one with 98% of SiO2 content and one with a greywacke. The dependence of ultrasonic impulse propagation velocity on the changes in the structure of mortars containing aggregates from these rocks was researched. The results of this work are not unambiguous yet and therefore it is necessary to carry out more extensive investigation with using of other methods that will allow to examine changes in the internal structure of composites more detailed.

scholarly journals Polymer action on alkali–silica reaction in cement mortar

2013 ◽  
Vol 44 ◽  
pp. 97-105 ◽  
Author(s):  
João Feiteira ◽  
Maria S. Ribeiro
Keyword(s):  
Cement Mortar ◽  
Alkali Silica Reaction

Activation Energy of Alkali-Silica Reactionin CFBC Fly Ash Geopolymer Mortars

2017 ◽  
Vol 882 ◽  
pp. 77-82 ◽  
Author(s):  
Chang Seon Shon ◽  
Dongoun Lee
Keyword(s):  
Activation Energy ◽  
Fly Ash ◽  
Cement Mortar ◽  
Alkali Silica Reaction ◽  
Fluidized Bed Combustion ◽  
Binding Properties ◽  
Different Temperatures ◽  
Naoh Solution ◽  
Cfbc Fly Ash ◽  
High Sulfate

The utilization of fly ashes produced by circulated fluidized bed combustion (CFBC) has been limited in construction application due to their inherent high sulfate and carbon contents although CFBC fly ash exhibits very good binding properties without requiring any supplementary activator. This study reports alkali silica reaction (ASR) behavior of CFBC fly ash geopolymer mortars in terms of activation energy using a modified ASTM C 1260/C 1567. Two different strengths of NaOH solution were used to test reactive and potentially reactive aggregates in the presence of CFBC fly ash. The other variables included a longer test period of 3 months and three different temperatures, namely 60°C, 70°C, and 80°C. It was observed that there was no significant expansion in CFBC fly ash based geopolymer mortar regardless of variation of temperature and alkalinity of test solution. Activation energy of CFBC fly ash geopolymer for ASR was higher than that of plain cement mortar irrespective of strength of NaOH solution.

An Examination on Hybrid Structures Renovated from the Old Railway Steel Bridges with Polymer Cement Mortar

2016 ◽  
Vol 106 (1) ◽  
pp. 1014-1019
Author(s):  
Nozomu TANIGUCHI ◽  
Yusuke SUGINO ◽  
Fujikazu OHKUBO ◽  
Weiwei LIN ◽  
Shinya SATAKE ◽  
...  
Keyword(s):  
Cement Mortar ◽  
Steel Bridges ◽  
Hybrid Structures

Incorporation of Iraqi Rocks in the Production of Eco-Friendly Cement Mortar

2020 ◽  
Vol 38 (10A) ◽  
pp. 1522-1530
Author(s):  
Rawnaq S. Mahdi ◽  
Aseel B. AL-Zubidi ◽  
Hassan N. Hashim
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Water Absorption ◽  
Structural Properties ◽  
Mechanical Milling ◽  
Cement Mortar ◽  
Cement Mortars

This work reports on the incorporation of Flint and Kaolin rocks powders in the cement mortar in an attempt to improve its mechanical properties and produce an eco-friendly mortar. Flint and Kaolin powders are prepared by dry mechanical milling. The two powders are added separately to the mortars substituting cement partially. The two powders are found to improve the mechanical properties of the mortars. Hardness and compressive strength are found to increase with the increase of powders constituents in the cement mortars. In addition, the two powders affect water absorption and thermal conductivity of the mortar specimens which are desirable for construction applications. Kaolin is found to have a greater effect on the mechanical properties, water absorption, and thermal conductivity of the mortars than Flint. This behavior is discussed and analyzed based on the compositional and structural properties of the rocks powders.

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