Experimental Investigation of Collapsible Soils Treatment Using Nano-silica in the Sivand Dam Region, Iran

2021 ◽  
Author(s):  
A. Johari ◽  
H. Golkarfard ◽  
F. Davoudi ◽  
A. Fazeli
Keyword(s):  
Experimental Investigation ◽  
Nano Silica ◽  
Collapsible Soils

scholarly journals Comparison of Conventional Concrete and Replacement of River Sand by Waste Foundry Sand and Cement by Nano-Silica

2020 ◽  
pp. 201-205
Keyword(s):  
Experimental Investigation ◽  
Compressive Strength ◽  
Partial Replacement ◽  
Fine Aggregate ◽  
Nano Silica ◽  
River Sand ◽  
Conventional Concrete ◽  
Foundry Sand ◽  
Concrete Production ◽  
Waste Foundry Sand

This paper presents an experimental investigation on the properties of concrete in which like cement is partially replacing by used nano silica and is partially replacing by used waste foundry sand. Because now a day the world wide consumption of sand as cement and as fine aggregate in concrete production is very high. Nano silica and waste foundry sand are major by product of casting industry and create land pollution. The cement will be replaced with nano silica and the river sand will be replaced with waste foundry sand (0%, 5%, 10%, 15%, 20%). This experimental investigation was done and found out that with the increase in the nano silica and waste foundry sand ratio. Compression test has been done to find out the compressive strength of concrete at the age of 7, 14, 21, and 28. Test result indicates in increasing compressive strength of plain concrete by inclusion of nano silica as a partial replacement of cement and waste foundry sand as a partial replacement of fine aggregate.

Drag load on end-bearing piles in collapsible soil due to inundation

2016 ◽  
Vol 53 (12) ◽  
pp. 2030-2038 ◽  
Author(s):  
Ibrahim Mashhour ◽  
Adel Hanna
Keyword(s):  
Experimental Investigation ◽  
Skin Friction ◽  
Soft Clay ◽  
Soil Layer ◽  
Design Procedure ◽  
Collapsible Soil ◽  
Negative Skin Friction ◽  
Collapsible Soils ◽  
Surrounding Soil ◽  
End Bearing Pile

Collapsible soils may experience sudden and excessive settlement when inundated. The use of pile foundations that penetrate the collapsible soil layer to reach a firm stratum is widely used in practice. However, when the ground is inundated, large and sudden settlement of the surrounding soil may take place, causing negative skin friction on the pile’s shaft, which may lead to catastrophic failure. In the literature, research dealing with negative skin friction for piles in collapsible soil is lagging due to the complexity of modeling collapsible soil analytically. Alternatively, results of sophisticated experimental investigation may produce valuable information to predict the negative skin friction and accordingly the drag load on these piles. This paper presents the results of an experimental investigation on a single end-bearing pile in collapsible soil. The investigation is tailored to measure the soil collapse before and during inundation and the associated drag load on the pile. The theory proposed by Hanna and Sharif in 2006 for predicting negative skin friction on piles due to consolidation of the surrounding soft clay was extended to predict the negative skin friction for these piles in collapsible soils. A proposed design procedure is presented.

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