scholarly journals Stabilization of problematic silty sands using microsilica and lime

2015 ◽  
Vol 10 (1) ◽  
pp. 61-70 ◽  
Author(s):  
Ali Ghorbani ◽  
Hadi Hasanzadehshooiili ◽  
Masoud Karimi ◽  
Younes Daghigh ◽  
Jurgis Medzvieckas
Keyword(s):  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Construction Projects ◽  
Road Construction ◽  
Silty Sand ◽  
Swelling Potential ◽  
The Road ◽  
Compressive Strength Test ◽  
Micro Structures

In this study, to stabilize problematic silty sand soils, Microsilica-Lime admixture was used as an additive. Various samples containing 0, 1, 2, 5, 10 and 15% (by weight) Microsilica and 0, 1, 3 and 5% (by weight) Lime were prepared. To investigate the role of the studied additives on the stabilization of the sandy soils, unconfined compressive strength of the materials and their swelling potential, were considered. To do this, unconfined compressive strength test, California Bearing Ratio, also, swelling tests were carried out. As a result, the unconfined compressive strength of samples with 10% Microsilica and 3% Lime in curing time of 28 days was obtained about 50 times larger than the strength of the untreated samples. On the other hand, the samples stabilized only with 1% Lime showed considerable swelling potential while adding only 1% Microsilica caused a considerable reduce in the amount of swelling. Unconfined compressive strength of samples containing 1% Microsilica and 1% Lime was about 12 times larger than the strength of the untreated samples and these samples showed less swelling potential. Then, these amounts are considered as the optimal amounts, which are used in the road construction projects. Also, the results obtained from scanning the samples using electron microscope illustrated that the Microsilica causes to form crystalline micro-structures in the soil which is the main cause for increasing the strength of stabilized samples.

Unconfined Compressive Strength and Drying Shrinkage of Cement Treated Recycling Base at Boyolali-Kartosuro Road Rehabilitation

2012 ◽  
Vol 626 ◽  
pp. 34-38
Author(s):  
Ary Setyawan ◽  
Anastasia Muda ◽  
Sholihin As’ad
Keyword(s):  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Cement Content ◽  
Drying Shrinkage ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
The Road ◽  
Road Base ◽  
Base Materials ◽  
Compressive Strength Test

Road rehabilitation and reconstruction generate large supplies of reclaimed asphalt pavement (RAP). One of the efforts to reuse the RAP is by insitu process and utilize it as road base materials. To get satisfying result from the RAP, it is necessary to add a certain amount of Ordinary Portland Cement (OPC) as stabilizer. This study investigate the potential use of OPC-stabilized RAP in road bases. Laboratory experimental method was applied by using material collected from road located at Boyolali-Kartasura as the object of the study with the cement content variations of 4%, 5% and 6% for unconfined compressive strength test (UCS) and the cement contents variation of 5% and 6% for drying shrinkage test. The range of cement contents required for unconfined compressive strength of cement treated recycling base (CTRB) are 5% to 6%. The cement content used at Boyolali - Kartosuro road rehabilitation was 5.5%. Drying shrinkage during 28 days is 805.3 micro strain for the cement content of 5% and 826.3 micro strain for the cement content of 6%. The drying shrinkage of the materials was quite high for CTRB, so that carefully design and attention need to take into account to avoid the cracks at the road base and the prospective of reflective cracking at the surface course of the road.

scholarly journals Stabilization of Marine Clay Soil Using Polyurethane

2018 ◽  
Vol 250 ◽  
pp. 01004 ◽  
Author(s):  
Samaila Saleh ◽  
Nur Zurairahetty Mohd Yunus ◽  
Kamarudin Ahmad ◽  
Nazri Ali
Keyword(s):  
Compressive Strength ◽  
Moisture Content ◽  
Unconfined Compressive Strength ◽  
Clay Soil ◽  
Organic Matter Content ◽  
Road Construction ◽  
Liquid Limit ◽  
Matter Content ◽  
Marine Clay ◽  
The Road

Many chemicals stabilisation techniques are being employed all over the world to improve the engineering and physical properties of the problematic soils and reduce the potential damages caused by them. Out of those chemical stabilisation technics, application of Polyurethane to improve the strength of marine clay was investigated in the laboratory. Characterization of the soil geotechnical properties was carried out by conducting laboratory test that includes natural moisture content, Atterberg limits, grains sizes analyses, specific gravity, moisture-density relationship, unconfined compressive strength (UCS), organic matter content and PH tests. Unconfined compressive strength test at optimum moisture content with varying the dose of the Polyurethane content was conducted to test the effectiveness of Polyurethane as a chemical stabiliser. The result of the preliminary tests of the sample shows that the soil has a liquid limit of 65%, plastic limit of 26% and plasticity index of 53%. The percentages of gravel, sand and fines in the marine clay sample were 0 %, 1.32 % and 98.68 % respectively %. The results of the UCS test also revealed that Polyurethane stabilisation improved the strength of marine clay by 230%. Thus, the improvement in strength of stabilised marine clay soil can significantly reduce the overall thickness of the pavement and total cost of the road construction in future.

scholarly journals Identification of geodetic risk factors occurring at the construction project preparation stage

2019 ◽  
Vol 9 (1) ◽  
pp. 14-17 ◽  
Author(s):  
Magdalena Kowacka ◽  
Dariusz Skorupka ◽  
Artur Duchaczek ◽  
Paweł Zagrodnik
Keyword(s):  
Risk Factors ◽  
Construction Projects ◽  
Expert Knowledge ◽  
Construction Project ◽  
Road Construction ◽  
Construction Process ◽  
The Road ◽  
Initial Stage ◽  
Preparation Stage

AbstractThe work contains information on the implementation of surveying works in the road construction process. The aim of the research was to identify geodetic risk factors occurring at the stage of preparation of a construction project, the presence of which can greatly disrupt the undertaking such as the road construction. The research was carried out on the basis of expert knowledge, documentation obtained from various road construction projects and the analysis of disturbances at the initial stage of works.

scholarly journals The Meaning of Water Environment for Stilt Houses on the Musi Riverbanks, Palembang

2021 ◽  
Vol 6 (2) ◽  
pp. 70-77
Author(s):  
Ari Siswanto ◽  
◽  
Ira Kusumawaty ◽  
Keyword(s):  
Water Environment ◽  
Road Construction ◽  
The Road ◽  
Lowland Area ◽  
Tidal Swamps ◽  
Agriculture Development ◽  
Musi River

Water functions are very diverse for humans for daily needs such as drinking water, bathing, agriculture, development, aesthetics, and lower temperatures. Palembang is a lowland area dominated by wetlands, tidal swamps, and rivers. The types of houses on stilts on the banks of the Musi river are limas, Gudang, and Chinese stilt houses which are always associated with the water environment. The construction of roads replacing the role of rivers has realized people that the water environment has an important meaning for the house on stilts. The research objective was to explore the meaning of the water environment from various aspects for residents, stilt houses, and their environment. This research method is a case study with data collection through interviews, observation, measurements, and taking photos. Data and findings were analyzed and juxtaposed with images in the field. The road construction has eliminated part of the function of the river and influenced the change in orientation of the house on stilts. In conclusion, respect for the water environment including rivers has decreased, causing the quality of the river to decline, and the house on stilts cannot take advantage of the existence of the water environment optimally

scholarly journals An investigation of Teratak Buluh sand as a foam mortar aggregate material

2021 ◽  
Vol 331 ◽  
pp. 06002
Author(s):  
Elsa Eka Putri ◽  
Doni Rinaldi Basri ◽  
Bayu Martanto Adji
Keyword(s):  
Compressive Strength ◽  
Soil Depth ◽  
Peat Soil ◽  
Road Construction ◽  
Research Centre ◽  
Peat Soils ◽  
The Road ◽  
West Sumatra ◽  
Hard Soil ◽  
Cement Mixture

Riau Province has the largest peat soil on Sumatra island. Peat soil has a low bearing capacity and very deep hard soil depth, even in some places up to 16 meters depth. This condition makes the construction of roads on peat soils will experience significant and unavoidable degradation and damage if no special handling is conducted. One of the efforts to overcome the situation in road construction is the use of foam mortar which has been developed by the Road and Bridge Research Centre (PUSJATAN) in 2013 which discovered the Foam Mortar Light Pile technology. This foam mortar is a cement mixture that has a lower density than water. This study conducted further research on finding the ratio of Cement vs. Sand in foam mortar which has a specific gravity smaller than water. The sand comes from Teratak Buluh Village, Kampar Regency, Riau Province and Cement (PCC) comes from Padang City, West Sumatra Province. The cement and sand ratio was varied; 1C:0.7S, 1C:0.8S, 1C:0.9S, 1C:1.0S, 1C:1.1S and 1C:1.2S. Cylindrical samples with a diameter of 10 cm and a height of 20 cm were subjected to a compression test using a modified CBR tool at the 7 day curing time. From the test results, samples at a ratio of 1C: 0.7S and 1C: 0.8S can float in water, with a density of 0.77 tonne/m3 and compressive strength of 901.20 kPa and a density of 0.83 tonne/m3 with a compressive strength of 971.35 kPa respectively.

scholarly journals Analysis of strength characteristics of carbon fiber–reinforced microbial solidified sand

2019 ◽  
Vol 11 (11) ◽  
pp. 168781401988442 ◽  
Author(s):  
Rongkang Qiu ◽  
Huawei Tong ◽  
Xiaotian Fang ◽  
Yuan Liao ◽  
Yadong Li
Keyword(s):  
Compressive Strength ◽  
Carbon Fiber ◽  
Unconfined Compressive Strength ◽  
Fiber Content ◽  
Strength Characteristics ◽  
Carbonate Content ◽  
Positive Role ◽  
Compressive Strength Test ◽  
Soil Process ◽  
The Impact

Microbial solidified sand effectively enhances the strength of the soil, but it will cause brittle failure. In order to reduce the impact of microbial solidification sand brittleness, an improved method for adding carbon fiber to microbial solidified sand is proposed. The qualitative analysis was based on unconfined compressive strength test, calcium carbonate content determination, and penetration test. The results show that the addition of fiber in the microbial solidified sand can significantly increase the unconfined compressive strength of the sample. The unconfined compressive strength of the sample increases first and then decreases with the increase of fiber addition. The addition of fibers during the soil process enhances the toughness of the specimen and causes plastic damage during the failure of the specimen. Based on the analysis of the microstructure of the sample, the effect of fiber bundles on the strength characteristics of the sample is discussed when the fiber content is higher than the optimal fiber content. The addition of carbon fiber to microbial solidified sand can greatly improve the strength of the sample and increase the toughness, which plays a positive role in improving the safety and stability of the project.

scholarly journals Quantum risks of the extreme temperatures implementation in london

2019 ◽  
Vol 135 ◽  
pp. 01068
Author(s):  
Zhanna Mogiljuk
Keyword(s):  
Statistical Analysis ◽  
Construction Projects ◽  
Global Climate ◽  
Extreme Temperature ◽  
Road Construction ◽  
Engineering Systems ◽  
Extreme Temperatures ◽  
The Road ◽  
Statistical Studies ◽  
Temperature Loads

The article deals with current problems of the road construction projects adaptation to the global climate change realities. It is shown that the existing regulations do not take into account the risks of extreme thermal processes. The method for the events statistical analysis of the extreme temperature realization are presented. The high-resolution statistical studies results of previously unknown regularities of the maximum and minimum temperatures intensity fluctuations evolution in the period from 1973 to 2009 are presented. Quantitative forecasting of tendencies in realization of the maximum and minimum daily temperatures for the period of all life cycle of buildings is shown. These estimates are intended to account for extreme temperature loads in the design of road construction objects and engineering systems. The paper first presented quantum regularities of the air temperature variations in the surface layer of the atmosphere obtained by the author and previously unknown. As an example, the article deals with the statistical analysis of the extreme temperatures variations in London. The graphic materials over the statistical studies of the maximum and minimum temperatures intensity evolution a period of more than 36 years are presented. The results of studies of integral and differential trends into the maximum and minimum temperatures evolution are given. The article deals with the forecast of the warming expected rate in London until 2067.

Effect of Acrylate-Cement Grout on the Unconfined Compressive Strength of Silty Sand

2019 ◽  
Vol 23 (6) ◽  
pp. 2495-2502
Author(s):  
Kean-Thai Chhun ◽  
Su-Hyung Lee ◽  
Sam-Ang Keo ◽  
Chan-Young Yune
Keyword(s):  
Compressive Strength ◽  
Unconfined Compressive Strength ◽  
Cement Grout ◽  
Silty Sand

Reclamation of the Temporary Land use for the Road Construction

2013 ◽  
Vol 726-731 ◽  
pp. 4965-4969
Author(s):  
Guo Zhan Luo ◽  
Jian Wang ◽  
Yu Peng Liu
Keyword(s):  
Construction Projects ◽  
Land Reclamation ◽  
Road Construction ◽  
Renewable Resource ◽  
Land Resource ◽  
Land Productivity ◽  
The Road ◽  
Resource Protection ◽  
Large Acreage ◽  
Investigation And Study

Land is limited and renewable resource, also the renewability of many composites of land productivity is limited. A large acreage of land is occupied temporarily or permanently by road construction projects. In the later stage of road construction projects, land reclamation is a key issue for land resource protection. Basing on investigation and study, this paper is to conclude the land reclamation methodology and key technologies, and provide technical reference.

Experiment and Mechanism Study on Effect of Water/Binder and Fly Ash on Mechanical Properties of HPC

2011 ◽  
Vol 255-260 ◽  
pp. 3404-3410
Author(s):  
Shuang Xi Li ◽  
An Quan Xu ◽  
Xin Jun Tang ◽  
Quan Hu
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Fly Ash ◽  
Concrete Strength ◽  
Early Period ◽  
Point Of View ◽  
Mechanism Study ◽  
Compressive Strength Test ◽  
Large Water

It takes on the technical and economic double benefits that fly ash taking the place of cement. However, water/binder of modern concrete is generally low; the research on the concrete performance which is based on large water/binder is no longer suitable for analysis of modern concrete. As to this problem, using different proportions of W/B and FA dosage as influencing factors, specimen is compounded for the compressive strength test. Then, mechanical properties of HPC are studied systematically. Based on this, macro-performance is analyzed from a micro-mechanism point of view through taking the electron micrograph. As the study shows, strength of HPC mixed with fly ash has low characteristics at early period while high ones at later period. At later hydration, fly ash effect plays a significant role, the growth rate of concrete strength increases as the increase of FA dosage. Compressive strength of concrete decreases as the increase of W/B and FA dosage. When the W/B is high, compressive strength is not sensitive to the change of W/B and FA dosage; but when the W/B decreases from 0.30 to 0.25, the concrete strength transition occurs. The influence of W/B on concrete compressive strength is more significant than that of the FA dosage; in the preparation of HPC, fly ash can be added more and cement is added less relatively by decreasing the W/B, displaying the role of micro-aggregate filling and modification, improving the strength and other performance of concrete. The study on micro-mechanism proves well the macro-phenomena above.

Sign in / Sign up

Export Citation Format

Share Document