Soil aggregates

Xem 1-14 trên 14 kết quả Soil aggregates
  • Standard Practice for classification of soils and soil-aggregate mixtures for highway construction purposes practice covers a procedure for classifying mineral and organomineral soils into seven groups based on laboratory determination of particle-size distribution, liquid limit, an plasticity index. It may be used when precise engineering classification is required, especially for highway construction purposes. Evaluation of soils within each group is made bymeans of a group index, which is a value calculated from an empirical formula.


    pdf8p tav2011 21-07-2015 40 4   Download

  • This study was undertaken to determine the relative strength of individual soil aggregates of different sizes and shapes against crushing forces. Soil aggregates were placed individually between a clean–fixed flat surface and a flat plate connected to a pocketpenetrometer and crushed under applied stress.

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  • The objective of this study was to determine the influence of selected soil properties on the relative strength of individual soil aggregates against crushing forces. Soil aggregates were crushed between a flat surface and a flat plate connected to a pocket penetrometer.

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  • Soil tensile strength (TS) and aggregate stability (AS) values can be used as indicators of soil structural quality. The objective of this study was to determine the influences of land use types, soil carbon and clay contents on soil structure.

    pdf8p masterbarista 14-01-2019 13 0   Download

  • Soils are aggregates of mineral particles, and together with air and/or water in the void spaces, they form three-phase systems. A large portion of the earth’s surface is covered by soils, and they are widely used as construction and foundation materials. Soil mechanics is the branch of engineering that deals with the engineering properties of soils and their behavior under stress.

    pdf594p tienwru 02-06-2013 60 20   Download

  • The content of WSAma with fractions 1-0.5 mm decreased with time. On the contrary, the content of WSAma with particle sizes above 5 mm increased with time in all treatments except the B10N2 and B20N2 treatments. A statistically significant trend was identified in the proportion of WSA in the B10N2 and B20N2 treatments, which indicates that biochar with higher application levels of N fertilizer stabilizes the proportion of water-stable aggregates.

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  • In coarse-textured soils, low water and nutrient holding capacity due to the high number of macropores limits crop growth. To minimize these limitations the application of various soil conditioners (SCs) has been extensively used in recent decades.

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  • Soil compaction caused by heavy wheeling reduces water infiltration, root development, and yield, and increases bulk density and soil strength. The objective of this study was to determine changes in spatial variability patterns of soil penetration resistance before and after using the silage machine in a corn-growing field.

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  • This paper deals with using stainless steel reducing slag (SSRS), a byproduct generated from stainless steel making process, as a cement substitute in production of soil-based controlled low-strength material (CLSM). In the CLSM mixture, surplus soil and river sand were blended well together with a sand-soil proportion of 6:4 by volume in order to produce fine aggregate. Totally, twelve mixtures were prepared for experiment when we changed in turn percentages of Portland cement replacement with SSRS of 0%, 10%, 20%, and 30% by weight and the water-to-binder ratio of 3.4, 3.6, and 3.8.

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  • The West Pearl Queen reservoir project also used soil gas surveys to detect PFC tracers that were injected into the reservoir with the CO2. Soil gas sampling was conducted before and after the CO2 injection by using capillary tubes and adsorbent packets for the tracers. Brookhaven National Laboratory (BNL) supplied the tracers and performed the tracer concentration analysis (Wells et al., 2007). Near-Surface Geophysics – The use of magnetometers is another possible near-surface geophysical technique.

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  • All combined or “synthetic” measures which try to measure environmental and economic changes in one indicator can be dismissed as over-simplistic. Beyond this, however, there is also the serious question of how meaningful it is to try to produce an estimate of national sustainability rather than assess the benefits and impacts of particular activities within a country.

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  • A seminomadic animal raising system, known as “yaylacilik” in Turkish, is one of the best ways of using upland rangelands, particularly in rough terrain regions. Three rangeland sites were selected to determine the spatial effect of summer grazing distribution on botanical composition, canopy coverage, soil aggregate stability, and forage nutrient content in these range sites.

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  • Several agencies and organizations have intensified their efforts to increase the productivity of land in these countries.They have introduced new strains of seed, improved irrigation techniques, and introduced new methods of fertilization and soil management.With ample sunlight for photosynthesis and modern irrigation techniques, sustainable farming techniques should allow farmers to boost aggregate production in order to meet demand.

    pdf223p thanhan 22-07-2009 821 460   Download

  • Standard laboratory methods for measurement of soil nitrate (NO3–N) use various procedures and instruments to analyze soil samples taken from the field and transported to the laboratory. Concerns with these procedures range from delays in measurement time, the high cost of soil sampling and analysis, high labour requirements, and the need to aggregate samples. With recent advances in using the ion-selective electrode, as presented in this chapter, soil NO3–N can now be measured directly, rapidly, accurately, at low cost, at a fine scale, and in real-time right in the field....

    pdf256p 123859674 04-07-2012 53 11   Download



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