What is Liquid Limit of Soil? When water is added to dry soil, it changes its state of consistency from hard to soft. If we add water to a fine grained soil, then water will change its consistency from hard to semi hard. If we continue to add more water then again the soil will … Read more
There are many factors which influence the degree of compaction in the field. Some are compactor dependent and some depend on the soil being compacted. The factors which affect the degree of compaction are given below. 1. Type of soil Type of soil has a great influence on its compaction characteristics. Normally, heavy clays, clays … Read more
Objective For determination of specific gravity of soil solids by pycnometer method. Equipment & Apparatus Pycnometer Sieve(4.75 mm) Vacuum pump Oven Weighing balance Glass rod Preparation sample After receiving the soil sample it is dried in oven at a temperature of 105 to 1150C for a period of 16 to 24 hours. Procedure Dry the … Read more
Compaction should not be confused with consolidation. At the end of the consolidation and/or compaction process, a closer packing of soil grains results, which leads to increased shear strength and decreased compressibility and permeability. Difference Between Compaction and Consolidation Soil Compaction It is a dynamic process Compaction is almost instantaneous Densification is due to reduction … Read more
Atterberg Limits of Soil The term Atterberg limits is named as per the Swedish agriculturist Albert Atterberg. When water is added into a soil mass, it changes its state from solid to liquid. He divided the entire range from solid to liquid into four stages: The solid state The semi-solid state The plastic state The … Read more
The sand is used in mortar for the following purposes Bulk It does not increase the strength of mortar. But it acts as adulterant. Hence the bulk volume of mortar is increased which results in reduction of cost Setting If building material is fat lime, the carbon dioxide is absorbed through the voids of sand … Read more
California Bearing Ratio or CBR test is the ratio of the force per unit area required to penetrate a soil mass with a standard circular piston of 50 mm dia, at the rate of 1.25 mm/min to that of force required to penetrate sample of compacted stone having CBR of 100%. The standard load corresponding … Read more
Quicksand Quicksand is a condition and not a soil type. This condition is created in saturated thick layers of loose fine sandy soils when disturbed either due to vibration, such as, from pile driving in the neighborhood, or due to pressure of flowing water (at the time of heavy pumping in excavation). The particles, in … Read more
The properties of a soil mixture are influenced more by variation in moisture content than by any other cause. Saturated soils are improved in strength by drainage and dry soils lose strength by saturation. A water logged ground is undesirable because of its low bearing capacity. Effect on Fine Grained Soil Fine grained (clayey) soils … Read more
Aim To determine the field density of soil at a given location by sand replacement method Reference IS-2720-Part-28-Determination of dry density of soils in place, by the sand replacement method Apparatus Sand pouring cylinder Calibrating can Metal tray with a central hole Dry sand (passing through 600 micron sieve) Balance Moisture content bins Glass plate … Read more