scholarly journals Reducing Soil Permeability Using Bacteria-Produced Biopolymer

2021 ◽  
Vol 11 (16) ◽  
pp. 7278
Author(s):  
Amanda Mendonça ◽  
Paula V. Morais ◽  
Ana Cecília Pires ◽  
Ana Paula Chung ◽  
Paulo J. Venda Oliveira
Keyword(s):  
Portland Cement ◽  
Sandy Soil ◽  
Xanthan Gum ◽  
Environmental Concerns ◽  
Curing Time ◽  
Soil Permeability ◽  
Short Term ◽  
Engineering Structures ◽  
Soil Particles ◽  
Hydraulic Gradients

The building of civil engineering structures on some soils requires their stabilisation. Although Portland cement is the most used substance to stabilise soils, it is associated with a lot of environmental concerns. Therefore, it is very pertinent to study more sustainable alternative methodologies to replace the use of cement. Thus, this work analyses the ability of the more sustainable xanthan-like biopolymer, produced by Stenotrophomonasmaltophilia Faro439 strain (LabXLG), to reduce the permeability of a sandy soil. Additionally, the effectiveness of this LabXLG is compared with the use of a commercial xanthan gum (XG) and cement for various hydraulic gradients and curing times. The results show that a treatment with either type of XG can be used to replace the cement over the short term (curing time less than 14 days), although a greater level of effectiveness is obtained with the use of the commercial XG, due to its higher level of purity. The soil treatment with LabXLG creates a network of fibres that link the soil particles, while the commercial XG fills the voids with a homogeneous paste.

Mechanical Strength of Lime-Rice Husk Ash Mortars: A Preliminary Study

2012 ◽  
Vol 517 ◽  
pp. 495-499 ◽  
Author(s):  
R. Méndez ◽  
M.V. Borrachero ◽  
J. Payá ◽  
J.M. Monzó
Keyword(s):  
Portland Cement ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Curing Temperature ◽  
Curing Time ◽  
Short Term ◽  
Similar Tendency ◽  
Pozzolanic Material ◽  
Binder Composition ◽  
Preliminary Study

Rice is produced in many countries in the world, and this product permits to feed a lot of people, most of them in developing countries. Approximately one tone of rice produces 200 Kg of rice husk, and when this rice husk is burnt 20% of rice husk ash (RHA) is obtained. A very important part of rice husk is abandoned in the field producing environmental problems. RHA can be obtained by controlled combustion, when this fact occurs, a good quality RHA is produced. This RHA can be used as a pozzolanic material in mixtures with lime or Portland cement, producing good mechanical properties and durability. In this work a preliminary results about the influence of RHA/lime ratio on workability and mortars strength was studied. The results showed that mortars workability improves when RHA/lime ratio do. Compressive strength (Cs) of mortars with different RHA/lime ratios was studied, in this sense, for 28 days curing time at 20°C an increase of Cs when RHA/lime ratio do is observed. However for 90 and 180 days curing time a maximum or Cs for RHA/lime equal to 2 is obtained. The lowest and highest Cs values obtained were 6 and 18 MPa respectively, when 20°C curing temperature was used. When curing temperature increases until 65°C similar tendency of Cs respecting RHA/lime ratio was observed. A preliminary study of binders for using in mortars tiles reveals that at least low quantities of Portland cement must be included in binder composition in order to obtain short term strengths that make easy tile demoulding process.

scholarly journals Fertility Impact of Separate and Combined Treatments with Biochar, Sewage Sludge Compost and Bacterial Inocula on Acidic Sandy Soil

Agronomy ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1612 ◽  
Author(s):  
Nikolett Uzinger ◽  
Tünde Takács ◽  
Tibor Szili-Kovács ◽  
László Radimszky ◽  
Anna Füzy ◽  
...  
Keyword(s):  
Organic Matter ◽  
Sewage Sludge ◽  
Microbial Activity ◽  
Sandy Soil ◽  
Combined Treatments ◽  
Short Term ◽  
Root Colonisation ◽  
Sludge Compost ◽  
Sewage Sludge Compost ◽  
Combined Application

The short-term effects of processed waste materials: sewage sludge compost (up to 0.5%), biochar made of paper sludge and grain husk (BC) (up to 2%) combined with plant growth-promoting rhizobacterial (PGPR) inoculum, on the fertility of acidic sandy soil at 65% of field capacity were tested in a pot experiment in separate and combined treatments. The soil pH, organic matter content, total and plant-available nutrients, substrate-induced respiration, arbuscular mycorrhizal fungal (AMF) root colonisation parameters and maize (Zea mays L.) biomass were investigated in experiments lasting two months. The positive priming (21% organic matter loss) induced by BC alone was not observed after combined application. The combination of compost and PGPR with 1.5% BC resulted in 35% higher P and K availability due to greater microbial activity compared to BC alone. Only compost applied alone at 0.5% gave a 2.7 times increase in maize biomass. The highest microbial activity and lowest AMF colonisation were found in combined treatments. In the short term the combined application of BC, compost and PGPR did not result in higher fertility on the investigated soil. Further research is needed with a wider range of combined treatments on acidic sandy soil for better understanding of the process.

Stabilization and Solidification of Oil-Contaminated Sandy Soil Using Portland Cement and Supplementary Cementitious Materials

2020 ◽  
Vol 32 (8) ◽  
pp. 04020220 ◽  
Author(s):  
Shamsad Ahmad ◽  
Omar S. Baghabra Al-Amoudi ◽  
Yassir M. H. Mustafa ◽  
Mohammed Maslehuddin ◽  
Muhammad H. Al-Malack
Keyword(s):  
Portland Cement ◽  
Sandy Soil ◽  
Cementitious Materials ◽  
Supplementary Cementitious Materials

scholarly journals Jambi and Palembang clay soil stabilization for pavement matrix in road construction by using Portland cement type I

2019 ◽  
Vol 276 ◽  
pp. 05005
Author(s):  
Wawan Kuswaya ◽  
Wahyudi Marsiano ◽  
Syafalni Syafalni ◽  
Jonbi
Keyword(s):  
Portland Cement ◽  
Soil Stabilization ◽  
Clay Soil ◽  
Test Procedure ◽  
Road Construction ◽  
Dry Weight ◽  
Type I ◽  
Curing Time ◽  
Cement Type ◽  
Highly Active

The need for a pavement matrix in road construction, especially in Sumatra area, is now more difficult and expensive because the deposit materials are concentrated in Java and most of them are not available. For this reason, soil stabilization is a way out of this problem. On this basis it is necessary to conduct stabilization research with highly active stabilization material by using Portland cement type I. The soil to be stabilized is clay soil which is derived from the areas of Jambi and Palembang and which has a low CBR value less than the requirement for sub base or pavement (< 10%), with the expected CBR value of stabilization to be suitable for road construction. This research covers physical and soil mechanical properties which are compaction parameter and CBR value with 3 days of dry curing time and 4 days of soak curing time using ASTM test procedure. Variations of cement addition were used of 6%, 8%, and 10% for the clay soil from Palembang and 8%, 10%, and 12% for the clay soil from Jambi, by percentage of dry weight of the sample test. The results of this study showed that the CBR value significantly increased with the addition of cement, with Palembang soil CBR value rising from 3.46% to 130.74% and Jambi soil CBR value rising from 7.20% to 206.43% respectively.

Controlling the Permeability of Sandy Soil Using Different Local Waste Materials

2020 ◽  
Vol 857 ◽  
pp. 302-310
Author(s):  
Aram Mohammed Raheem
Keyword(s):  
Sandy Soil ◽  
Pore Water Pressure ◽  
Water Pressure ◽  
Ground Movement ◽  
Waste Materials ◽  
Saturated Sand ◽  
Water Drainage ◽  
Soil Permeability ◽  
Sand Column ◽  
Experimental Procedure

Advanced developed technologies associated with people demands have caused production and expansion of different local wastes where the process of managing such waste becomes a real need for controlling the pollution risk. One of the procedures for recycling can be made through using local wastes in permeability control for sandy soil since the soil permeability plays a crucial function on the water drainage, pore water pressure buildup and dissipation, and ground movement for saturated sand during and after earthquake occurrences. In addition, any economical mixture should maintain hydraulic constraints for practice use. In this study, a laboratory experiment was prepared to perform tests for estimating the water movements and permeability in a pure sand column and treated sandy soil with different locally waste materials including plastic, glass, rubber, and aluminum. In addition, a numerical investigation including finite element method has been adopted to verify the experimental procedure. It was shown that the permeability could be controlled to different rates using these local wastes.

Influence of Two Types of Nanosilica Hydrosols on Short-Term Properties of Sustainable White Portland Cement Mortar

2018 ◽  
Vol 30 (2) ◽  
pp. 04017289 ◽  
Author(s):  
Payam Hosseini ◽  
Masoume Abolhasani ◽  
Fatemeh Mirzaei ◽  
Mohammad Reza Kouhi Anbaran ◽  
Yousef Khaksari ◽  
...  
Keyword(s):  
Portland Cement ◽  
Cement Mortar ◽  
Short Term ◽  
White Portland Cement

Effect of Urease Dosages in Biocementation Process for Improving Strength of Sandy Soil

2014 ◽  
Vol 931-932 ◽  
pp. 698-702 ◽  
Author(s):  
Janjit Iamchaturapatr ◽  
Keeratikan Piriyakul
Keyword(s):  
Calcium Carbonate ◽  
Shear Modulus ◽  
Sandy Soil ◽  
Strength Development ◽  
Biochemical Process ◽  
Solution Ph ◽  
Crystal Forms ◽  
Soil Particles ◽  
Earth Structures ◽  
G Value

Soil biocementation is the new technique using biochemical process to initiate the crystal forms of calcium carbonate (CaCO3) to bind the soil particles resulting in soil mechanical improvement. This research examines the effect of urease (UR) dosages on the strength development of sandy soil in biocemented sand reactor (BSR). Our results found that urease dosages between 5-30% (v/v) affected the strength development in sandy soil in term of shear modulus (G). Addition of UR resulted on an increase of solution pH. Highest solution pH during the treatment was found at UR 20%, as well as highest G value. Formation of CaCO3 in biocemented sand could be useful for the stabilization of the sand or earth structures.

Assessment of Hydrophilic Biochar Effect on Sandy Soil Water Retention

2017 ◽  
Vol 751 ◽  
pp. 790-795 ◽  
Author(s):  
Ramida Rattanakam ◽  
Pinitpon Pituya ◽  
Mantana Suwan ◽  
Sitthisuntorn Supothina
Keyword(s):  
Soil Water ◽  
Functional Groups ◽  
Sandy Soil ◽  
Water Retention ◽  
Soil Permeability ◽  
Soil Water Retention ◽  
Soil Additives ◽  
Oxygenated Functional Groups ◽  
Factor Governing

This paper reports studies to investigate the relationships between hydrophobicity of biochar surface and soil water retention. The studied biochars were produced from acacia wood, cashew wood and bamboo. The resulting materials were oxidized via liquid oxidation to generate hydrophilic biochars containing oxygenated functional groups on the surface. All biochars were characterized and their ability as soil additives to enhance water retention was assessed. Our results suggest that hydrophobicity/hydrophilicity of biochars is not the major factor governing water retention ability of this particular soil. However, hydrophilicity of biochar helps improve soil permeability by providing better wettability to the soil.

scholarly journals Influence of Nanolime and Curing Period on Unconfined Compressive Strength of Soil

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Panbarasi Govindasamy ◽  
Mohd Raihan Taha ◽  
Jamal Alsharef ◽  
Kowstubaa Ramalingam
Keyword(s):  
Compressive Strength ◽  
Moisture Content ◽  
Unconfined Compressive Strength ◽  
Curing Time ◽  
Strength Gain ◽  
Treated Soil ◽  
Soil Particles ◽  
Curing Period

This paper presents the improvement of the unconfined compressive strength (UCS) of soil by mixing different percentages of nanolime and 5% lime with soil. The UCS of treated soil increased significantly over curing time with increasing percentage of nanolime. The optimum results were reached at only 0.5% nanolime admixtures which were much higher than 5% lime admixture. This may be due to higher ability of nanolime to flocculate and agglomerate the soil particles compared with the lime. In addition, the lime could fill only the micropores while nanolime could fill the micro- and nanopores as well. The strength gain is inversely proportional to the remolded moisture content and curing period. However, when the content of nanolime used is larger than 0.5%, nanolime particles are not uniformly dispersed. Therefore, a weak area in the form of voids is created, consequently the homogeneous hydrated microstructure cannot be formed, and finally the strength will decrease.

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