Impact of crushed limestone dust on concrete’s properties

2021 ◽  
Author(s):  
Jagdeep Singh ◽  
Abhilash Mukherjee ◽  
Vishal Kumar Dhiman ◽  
Deepmala
Keyword(s):  
Limestone Dust ◽  
Crushed Limestone

scholarly journals Crushed Limestone Dust Valorization for Eco Friendly non Fired Wall Tiles

2016 ◽  
Vol 64 ◽  
pp. 07002 ◽  
Author(s):  
Ubolrat Wangrakdiskul ◽  
Kannika Benjaratthapong ◽  
Meatra Jongtrakulsiri
Keyword(s):  
Limestone Dust ◽  
Crushed Limestone

C60 High Performance Concrete Prepared from Manufactured Sand with a High Content of Microfines

2009 ◽  
Vol 405-406 ◽  
pp. 204-211 ◽  
Author(s):  
Bei Xing Li ◽  
Ji Liang Wang ◽  
Ming Kai Zhou
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Clay Content ◽  
Chloride Ion ◽  
Ion Permeability ◽  
River Sand ◽  
Manufactured Sand ◽  
Freeze Thaw ◽  
Limestone Dust ◽  
Crushed Limestone

The workability, strength and modulus of elasticity, drying shrinkage and creep, and chloride ion permeability as well as freeze-thaw resistance of the C60 high Performance concretes (HPCs) with manufactured sand (MS) containing crushed limestone dust in percents ranging from 3.5% to 14% were experimentally investigated. The results were compared with those of river sand (RS) concrete. In addition, the effect of clay amounts at 3% and 5% in MS on properties of C60 HPCs was also investigated. The results showed that expect for the creep, the other performances of C60 MS-HPCs with crushed limestone dust content of 7% to 10.5% were excellent or compared favorably with those of C60 RS-HPCs. The increment of clay content in MS obviously decreased workability, increased dry shrinkage and accelerated freeze-thaw destruction of C60 MS-HPCs, but didn’t affecting compressive strength and chloride ion permeability of the concrete. It was concluded that C60 HPC can be made with MS with a high content of crushed limestone dust but the amount of clay in MS should be controlled to a low limit.

Comparison of Superpave and Marshall Mixtures for Low-Volume Roads and Shoulders

1998 ◽  
Vol 1609 (1) ◽  
pp. 44-50 ◽  
Author(s):  
Affan Habib ◽  
Mustaque Hossain ◽  
Rajesh Kaldate ◽  
Glenn Fager
Keyword(s):  
Mix Design ◽  
River Sand ◽  
Low Volume Roads ◽  
Superpave Gyratory Compactor ◽  
Asphalt Content ◽  
Low Volume ◽  
Project Site ◽  
Axle Loads ◽  
Crushed Limestone ◽  
Asphalt Film

Superpave and Marshall mix designs using local aggregates were done to study the suitability of the Superpave mix design as compared with the Marshall mix design for low-volume roads, especially shoulders. The project site was Kansas Route 177 in northeast Kansas. Three locally available aggregates, crushed limestone and coarse and fine river sands, were used in this study. Five blends with varying proportions of coarse and fine river sands were selected. Mix samples were compacted in the Superpave gyratory compactor with the applicable number of gyrations and were compacted with the Marshall hammer by using 50 blows per face. Bulk densities of the compacted samples and maximum specific gravities of loose samples also were measured for each blend. The results show that the Superpave mix design for low-volume roads and shoulders results in lower estimated asphalt content than does the Marshall method. The required asphalt content increases as the proportion of coarse river sand increases in the mix. Superpave requirements for the voids filled with asphalt (VFA) for low-volume traffic, that is, less than 0.3 million equivalent single-axle loads, appeared to be too high. High asphalt film thicknesses were computed for the mixtures that did not meet the Superpave VFA requirements. Lowering the design number of gyrations (Ndes) for compaction of samples would result in increased asphalt requirement for the Superpave mixture with a given gradation.

scholarly journals Modelling the critical concentration of mixed filler in mastic with synthetic wax

2019 ◽  
Vol 262 ◽  
pp. 05008 ◽  
Author(s):  
Grzegorz Mazurek ◽  
Marek Iwański
Keyword(s):  
Critical Concentration ◽  
Hydrated Lime ◽  
Critical Value ◽  
Filler Concentration ◽  
Mathematical Function ◽  
Parallel Plates ◽  
Proposed Model ◽  
Wax Content ◽  
Filler Phase ◽  
Limestone Dust

This article presents the results of tests of mastic containing mixed filler (limestone dust/hydrated lime) and Fisher-Tropsch synthetic wax. Synthetic wax content was controlled up to 3% (w/w). The ratio of filler in the bitumen was from 0.5 to 3 (w/w), with hydrated lime content of up to 30% w/w. The rheological properties of different mastic compositions were determined with a rheometer equipped with two parallel plates at 60°C using oscillating load. The primary purpose of the article was to determine the nature of mastic stiffness changes in the context of using hydrated lime and synthetic wax as the filler. Consequently, the article proposes a method for evaluation of the critical value of the filler phase in the phase of bitumen modified with synthetic wax. The proposed model of the mathematical function was used to determine the nature of mastic structuring throughout the range of the experiment. The model was also used to determine the critical concentration of the filler in the bitumen phase. It was demonstrated that below the critical filler concentration the mastic behaved in a significantly different manner from the behaviour observed above this critical concentration. When the critical concentration of the filler was exceeded, it resulted in an excessive increase of mastic stiffness, which was considered in the model.

CHARACTERISTICS OF AEROSOLS IN BEIJING-TIANJIN AREA OF CHINA BY PIXE AND INAA AND IDENTIFICATION OF THEIR SOURCES BY CEB

1992 ◽  
Vol 02 (04) ◽  
pp. 593-601 ◽  
Author(s):  
Sha Yin ◽  
Liu Pingsheng ◽  
Hu Zhaohui ◽  
Zhong Ming ◽  
Yang Shaojin ◽  
...  
Keyword(s):  
Coal Combustion ◽  
Fine Particles ◽  
Motor Vehicle ◽  
Chemical Elements ◽  
Sea Salt ◽  
Soil Dust ◽  
Air Filter ◽  
X Ray ◽  
Sea Salt Aerosol ◽  
Limestone Dust

Proton Induced X-ray Emission (PIXE) and Instrumental Neutron Activation Analysis (INAA) techniques were used to measure the contents of 45 elements in 150 air-filter samples collected by cascade impactor with 8 stages at 10 sites in Beijing-Tianjin area of China during the periods of the winter of 1983 and the summer of 1984. It was noticed that the toxic elements such as As, Sb, Se, Pb, Hg, Cu and Ni were mainly enriched in fine particles with diameter less than 2 um. The major seven sources of coal burning, soil dust, oi1 burning, sea-salt aerosol, motor vehicle emission, limestone dust and industrial refuse attributing to the pollution in Tianjin area were identified by Chemical Elements Balance method (CEB). Among them the most important sources were the soil dust and the emission from coal-combustion followed by contributions from limestone and industrial refuse.

Sign in / Sign up

Export Citation Format

Share Document