Properties of Normal-Strength Mortar Containing Coarsely-Crushed Bottom Ash Considering Standard Particle Size Distribution of Fine Aggregate

Human existence is dependent on the consumption of electricity and of thermal energy. One of the environmental problems is represented by the particulate matter with the diameter of less than 2.5 mm derived from combustion of coal. In order to find solutions to reduce emissions at source, the particle size distribution of the coal bottom ash after removing it from the steam boiler of the large combustion plant from Romag Halanga in Drobeta Turnu – Severin area was determined. Dry particle size distribution shows that the major fraction is one that has a particle size of 125 μm. Particle size distribution in the smallest size fraction was performed with laser diffraction particle size analyzer Brookhaven 90 Plus Nanoparticle Size Analyzer. Particle size distribution shows that in the composition of the coal bottom ash were found particles with nanometric dimensions.

Download Full-text

Influence of particle size distribution of conventional fine aggregate and construction demolition waste aggregate in Portland cement mortar

Cerâmica ◽

10.1590/0366-69132021673833035 ◽

2021 ◽

Vol 67 (383) ◽

pp. 269-276

Author(s):

P. Kruger ◽

P. Serbai ◽

A. S. A. Chinelatto ◽

E. Pereira

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Portland Cement ◽

Size Distribution ◽

Cement Mortar ◽

Fine Aggregate ◽

Demolition Waste

Download Full-text

Prediction of Sorbent Performance in a Circulating Fluidized Bed Boiler Based on Petrographic Properties

Journal of Engineering for Gas Turbines and Power ◽

10.1115/1.2431388 ◽

2006 ◽

Vol 129 (2) ◽

pp. 565-571 ◽

Cited By ~ 7

Author(s):

Peter L. Rozelle ◽

Sarma V. Pisupati ◽

Alan W. Scaroni

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Fluidized Bed ◽

Circulating Fluidized Bed ◽

Bottom Ash ◽

Circulating Fluidized Bed Boiler ◽

Operating Data ◽

Full Load ◽

Full Load Operation

A method for prediction of sorbent consumption is presented here and has been developed based on plant operating data for a boiler in which several limestone and dolostone products were tested under similar firing conditions. The method considers the characteristic partitioning of calcium and sulfur between the flyash and bottom ash stream for the boiler, the feed particle size distribution of the sorbent, and petrographic properties of the sorbents. The predictions of sorbent usage were compared to plant operating data for five sorbents, of two distinct petrographic types. The plant operating data used featured full load operation. The five sorbents tested were all from Pennsylvania, and each contained greater than 40wt.% CaO. In four of the five cases, the predicted sorbent usage was within 10wt.% of the average full load sorbent usage by the boiler.

Download Full-text

Evaluation of Sand Quality and its Effect on Mortar and Cement Concrete

Science & Technology Journal ◽

10.22232/stj.2020.08.02.10 ◽

2020 ◽

Vol 8 (2) ◽

pp. 62-68

Author(s):

H. Laldintluanga ◽

◽

Rebecca Ramhmachhuani ◽

Ram thlengliani

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Clay Content ◽

Raw Material ◽

Fine Aggregate ◽

River Sand ◽

Proctor Test ◽

Additional Water ◽

Different Sources

The most used raw material in concrete are cement, sand and coarse aggregate. The study involved performing a series of tests on river sand and crushed sand that was collected from different sources to find the feasibility of commonly used sand in Mizoram. The properties of sand have been checked in terms of particle size distribution, fineness modulus, specific gravity. The effect of different sources of sand which are having different properties in mortar and concrete has been investigated. The sand was collected from different source having different particle size distribution as well as different silt and clay content. The quantity of water calculated based on normal consistency value cannot be applied to mortar which has sand having cohesion. Optimum moisture content calculated using the Standard Proctor test for cohesive sand is used to find out the additional water required on the mortar mix. The mortar with an exact amount of water has higher strength and density. The bonding is weakened in strength by non- binding material like silt and clay. Test results show that a decrease in compressive strength when the ratio of silt content to fine aggregate increase. It is found out that there is a large variation in the strength of mortar and concrete due to variation in the quality of sand use.

Download Full-text

A STUDY ON THE FLUIDITY OF MORTAR WITH FINE AGGREGATE ADJUSTED GRAIN-SIZE AND POWDERS

Proceedings of International Structural Engineering and Construction ◽

10.14455/isec.res.2018.67 ◽

2018 ◽

Vol 5 (2) ◽

Author(s):

Shohei Koizumi ◽

Koji Takasu ◽

Hidehiro Koyamada ◽

Hiroki Suyama

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Fine Particles ◽

Fine Powder ◽

Past Research ◽

Fine Aggregate ◽

Fresh Properties ◽

Flow Area ◽

Particles Size Distribution

It has been clarified that the particle shape and particle size distribution of fine aggregate have influenced the fresh properties of concrete and mortar in the past research. But it has not been sufficiently studied how each particle size and particle size distribution of fine aggregate affects the fresh properties of mortar and concrete. In this study, we adjusted the particle size of fine aggregate, and evaluated fresh properties of mortar by indicators. We investigated the fluidity of mortar, which changed depending on the composition of particle size distribution. In addition, the behavior of fresh properties of mortar contained powder substituted as part of cement and fine aggregate adjusted particle size distribution was compared with that when no powder was mixed. Its behavior was discussed. It became clear that, the factor influencing the fluidity varied depending on the composition of particle size distribution. The influence of fine particles on fluidity of mortar varied depending on the content of fine particle and the particles size distribution. When combined with the large particles, the fluidity was improved as compared with the combination with the intermediate particles. In addition, the same tendency as in powder-free mixing was confirmed at powder mixing and increase rate of the relative flow area ratio when fly ash was contained became larger than when the limestone fine powder was contained.

Download Full-text