Development of Magnesium-Silicate-Hydrate Cement by Pulverized Fuel Ash

2016 ◽  
Vol 709 ◽  
pp. 61-65 ◽  
Author(s):  
Ting Ting Zhang ◽  
Yan Nan Du ◽  
Yan Jie Sun ◽  
Zi Ming He ◽  
Zhen Lin Wu
Keyword(s):  
Silica Fume ◽  
Low Cost ◽  
Magnesium Silicate ◽  
Magnesium Carbonate ◽  
Hydration Reaction ◽  
Hydrated Calcium Silicate ◽  
Initial Strength ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Pulverized Fuel Ash

Magnesium silicate hydrate (M-S-H) gel can be fabricated via the reaction of MgO with silica fume in the presence of sodium hexametaphosphate (Na-HMP). In this study, in effort to reduce the cost of the M-S-H gel system, pulverized fuel ash (PFA) was utilized as a silica source to replace silica fume. The influence of various PFA quantities on the compression strength and other properties of the M-S-H system were investigated via XRD, SEM, and TG-RTG analysis. Compressive strength was optimal when 35 wt% of silica fume was replaced. The hydration products were relatively more complex when PFA was used, containing hydrated calcium silicate, hydrated magnesium silicate, and carbonate gel, among other products. Magnesium carbonate participated in the hydration reaction process, which generated carbonated gel to form a grid structure and promoted the initial strength of the material. Taken together, the results showed that PFA can be feasibly and effectively used to form M-S-H gel cement systems at low cost.

Packing Density Improvement for Improving Strength of Cement Paste

2019 ◽  
Vol 943 ◽  
pp. 124-128 ◽  
Author(s):  
Jian Jian Chen ◽  
Hong Niao Chen ◽  
Gu Li
Keyword(s):  
Silica Fume ◽  
Packing Density ◽  
Water Film ◽  
High Strength ◽  
Cementitious Materials ◽  
Maximum Strength ◽  
Depth Analysis ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Pulverized Fuel Ash

To design a mix for high-strength concrete is not easy, one of the methods is to improve the packing density of the cementitious materials. To study the effect of packing density on strength, a comprehensive research program using superfine pulverized fuel ash and silica fume was carried out. Results showed that a high superfine pulverized fuel ash and silica fume ratios could result in a lower optimum W/CM ratio for maximum strength. Depth analysis illustrated that the optimum water film thickness for maximum strength is always at around 0.01 to 0.05 μm, regardless of the SPFA and SF ratios.

An investigation of some alternative aggregates for use in concrete

1998 ◽  
Vol 13 (1) ◽  
pp. 185-192
Author(s):  
A. K. Butler ◽  
A. M. Harrisson
Keyword(s):  
Low Cost ◽  
Mix Design ◽  
Waste Materials ◽  
China Clay ◽  
Alternative Materials ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Pulverized Fuel Ash

AbstractThe use of some waste materials as aggregate for concrete has been investigated. Three specific materials were examined, china clay waste, slate waste and pulverized fuel ash. The project investigated methods of utilising alternative materials as aggregate either by low cost processing, novel mix design or by the use of admixtures.

Measurement and Prediction of Absorption of Cementitious Systems Using RILEM Vacuum Saturation Method

2011 ◽  
Vol 243-249 ◽  
pp. 156-159
Author(s):  
Iqbal Khan Mohammad
Keyword(s):  
Silica Fume ◽  
Prediction Models ◽  
Supplementary Cementitious Materials ◽  
Cement Matrix ◽  
Analytical Prediction ◽  
Vacuum Saturation ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Saturation Method ◽  
Pulverized Fuel Ash

Measurement and prediction of absorption of concrete by saturation method is presented. Measurement of absorption of concrete consisting of supplementary cementitious materials was conducted by using vacuum saturation method in accordance to RILEM. Pulverized fuel ash and silica fume were incorporated as partial cement replacements for the preparation of various combinations of cementitious composite systems. Absorption of cement matrix containing ordinary Portland cement, pulverized fuel ash and silica fume at various ages is reported. Based on the experimentally obtained results, analytical prediction models were developed. These models enabled the establishment of isoresponse contours showing the interactive influence between the various parameters investigated.

An experimental study on cyclic behaviour of reinforced concrete connections using waste materials as cement partial replacement

2019 ◽  
Vol 46 (6) ◽  
pp. 522-533
Author(s):  
Yasmin Murad ◽  
Yousef Abu-Haniyi ◽  
Ala AlKaraki ◽  
Zeid Hamadeh
Keyword(s):  
Silica Fume ◽  
Waste Materials ◽  
Partial Replacement ◽  
Cyclic Tests ◽  
Concrete Compressive Strength ◽  
Cyclic Behaviour ◽  
Fuel Ash ◽  
Pulverized Fuel ◽  
Concrete Materials ◽  
Pulverized Fuel Ash

A series of cyclic tests on unconfined beam–column connections with composite concrete materials are conducted. Cement is partially replaced by waste materials using two different percentages of 15% and 20%. The proper percentage of cement replacement is found to be 15% for the pulverized fuel ash, silica fume, and iron filings. Increasing the percentage to 20% tends to relatively decrease concrete compressive strength, weaken the joint, and reduce its ductility. It is recommended using pulverized fuel ash to enhance the performance of beam–column connections under cyclic loading. Silica fume and iron filings have also enhanced the joint response, but the enhancement is most remarkable when using 15% pulverized fuel ash. The implementation of composite concrete has increased the joint’s ductility and reduced its level of damage based on the type and percentage of the implemented waste material. Furthermore, the disposal of waste materials into the concrete mix is a good solution for reducing environmental pollution.

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