scholarly journals Early-Age Hydration Reaction and Strength Formation Mechanism of Solid Waste Silica Fume Modified Concrete

Molecules ◽  
2021 ◽  
Vol 26 (18) ◽  
pp. 5663
Author(s):  
Tao Luo ◽  
Cheng Hua ◽  
Qiang Sun ◽  
Liyun Tang ◽  
Yu Yi ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Solid Waste ◽  
Silica Fume ◽  
Morphological Characteristics ◽  
Early Age ◽  
Hydration Reaction ◽  
Compressive Strength Of Concrete ◽  
Early Age Hydration ◽  
Lf Nmr

Solid waste silica fume was used to replace fly ash by different ratios to study the early-age hydration reaction and strength formation mechanism of concrete. The change pattern of moisture content in different phases and micro morphological characteristics of concrete at early age were analyzed by low field nuclear magnetic resonance (LF-NMR) and scanning electron microscope (SEM). The results showed that the compressive strength of concrete was enhanced optimally when the replacement ratio of solid waste silica fume was 50%. The results of LF-NMR analysis showed that the water content of modified concrete increased with the increase of solid waste silica fume content. The compressive strength of concrete grew faster within the curing age of 7 d, which means the hydration process of concrete was also faster. The micro morphological characteristics obtained by SEM revealed that the concrete was densest internally when 50% fly ash was replaced by the solid waste silica fume, which was better than the other contents.

scholarly journals Research on Mechanical Performance & Behaviour of Geopolymer Concrete Subjected to Elevated Temperatures

2019 ◽  
Vol 8 (2S8) ◽  
pp. 883-887
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Elevated Temperatures ◽  
Mechanical Performance ◽  
Geopolymer Concrete ◽  
Sem Images ◽  
Before And After ◽  
Alkaline Conditions ◽  
Compressive Strength Of Concrete

The investigative studies on mechanical performance & behaviour, of Geopolymer Concrete (GPC) before and after the exposure to elevated temperatures (of 200 0 C -1000 0 C with an increment of 100 0 C). Indicate that the GPC Specimens Exhibited better Compressive strength at higher temperatures than that of those made by regular OPC Concrete with M30 Grade. The chronological changes in the geopolymeric structure upon exposure to these temperatures and their reflections on the thermal behaviour have also been explored. The SEM images indicate GPC produced by fly ash , metakaolin and silica fume, under alkaline conditions form Mineral binders that are not only non-flammable and but are also non-combustible resins and binders. Further the Observations drawn disclose that the mass and compressive strength of concrete gets reduced with increase in temperatures.

Effect of the Combination of Calcined Shale and Pozzolanic Materials on Compressive Strength of Concrete

2013 ◽  
Vol 723 ◽  
pp. 298-302
Author(s):  
An Cheng ◽  
Wei Ting Lin ◽  
Sao Jeng Chao ◽  
Hui Mi Hsu ◽  
Chin Cheng Huang
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Water Demand ◽  
Test Results ◽  
Calcination Temperatures ◽  
Heat Treated ◽  
Compressive Strength Of Concrete ◽  
Pozzolanic Materials

This study investigated the influence of individual constituents of calcined shale or hybrid constituents of calcined shale and fly ash or silica fume on the workability and compressive strength. Calcined shale is heat treated in a kiln and then ground to a finer powder and the calcination temperatures of 800 °C were used. The test results demonstrated that the workability and compressive strength decreased with the inclusion of calcined shale increased and the compressive strength of the specimens containing calcined shale all lower than that of the control specimens. It might be due to the higher water demand and lower CaO value. However, the hybrid batches with calcined shale and fly ash or silica fume enhanced better performance on compressive strength than individual constituents of calcined shale. The combination of 10 % calcined shale and 10 % silica fume in concrete seemed to give superior compressive strength and gave the highest value in the testing series. Finally, the inclusion of calcined shale is help to reduce the emissions of CO2and revealed an ecological advantage for concrete containing a binder blend of cement and calcined shale.

scholarly journals HYDRATION OF PLASMA-TREATED ALUMOSILICATE BINDERS

2014 ◽  
Vol 54 (5) ◽  
pp. 348-351
Author(s):  
Vít Šmilauer ◽  
Oleg Babchenko ◽  
Štepán Potocký ◽  
Alexander Kromka
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Plasma Treatment ◽  
Material Science ◽  
Hydration Heat ◽  
Early Age ◽  
Hydrophilic Surface ◽  
Hydration Kinetics ◽  
Early Age Hydration

Plasma treatment offers several applications in material science. In this research, the potential of plasma treatment is explored on the hydration of hydrophilic CNT-enriched cement and hydrophilic fly ash. The evolution of the hydration heat and the compressive strength show that a hydrophilic surface slightly accelerates the early-age hydration kinetics, while the long-term properties remain unchanged.

The Design and Application of Ballastless Track Enhanced Concrete Mineral Admixture

2014 ◽  
Vol 638-640 ◽  
pp. 1427-1430 ◽  
Author(s):  
Bao Guo Ma ◽  
Fang Jie Chen ◽  
Bing Liu Zhang ◽  
Chao Liang Lin
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
Mineral Admixture ◽  
Ballastless Track ◽  
Compressive Strength Of Concrete ◽  
Calcium Formate ◽  
Design And Application

Calcium formate and superfine powders comprised of fly ash, slag and silica fume have been used as raw marerials in this research. The results showed that when superfines powders were mixed with 1.5% calcium formate in a fixed porpotion, the 1 day and 28 day compressive strength of concrete can increase 133.7% and 115.9%, respectively.

Effect of fly ash and nanosilica on compressive strength of concrete at early age

2014 ◽  
Vol 114 (2) ◽  
pp. 99-106 ◽  
Author(s):  
N. M. García ◽  
L. E. Zapata ◽  
O. M. Suárez ◽  
M. Cabrera-Ríos
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Early Age ◽  
Compressive Strength Of Concrete

Very high volume fly ash concrete utilizing microash and hydrated lime, with silica fume

2021 ◽  
pp. 1-29
Author(s):  
Himabindu Myadaraboina ◽  
David Law ◽  
Indubhushan Patanikuni
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Silica Fume ◽  
High Volume ◽  
Hydrated Lime ◽  
Environmental Benefits ◽  
Hydration Reaction ◽  
Portland Cement Concrete ◽  
Durability Properties ◽  
High Volume Fly Ash

The incorporation of high volume fly ash, up to 80%, in concrete without compromising the mechanical and durability properties is potentially very advantageous to the concrete industry in enabling the delivery of economic, social and environmental benefits. To assess this, two high volume fly ash mix designs incorporating 80% class F ultra-fine fly ash, known as microash and hydrated lime, with 10% silica fume and 0 % silica fume have been investigated. Properties investigated are compressive strength, carbonation, chloride ion penetration, water absorption and permeability. The specimens were cured for a maximum period of 90 days to optimize completion of the hydration reaction. The results show that the concrete manufactured with 80% microash exhibited compressive strength in excess of 40 MPa at 28 days and over 70 MPa at 90 days. The material also displayed excellent durability properties compared to the normal Portland cement concrete and other high volume fly ash concretes. The addition of silica fume improved the strength and durability properties of the material.

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