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SOIL INVESTIGATION AND EXPLORATION
Written on 3 Sep, 2010 at 22:55 in Foundation, Geotechnical, Miscellaneous, Soil Exploration | viewed 130 views times and users have made 1 comment so far
The purpose of site investigation is to get clear information about the soil and hydrological conditions at the site. Site reconnaissance It means the inspection of the site and study of topography to get a proper information about the soil... (Continue reading)
ENVIRONMENTAL EXPOSURE CONDITIONS OF STRUCTURES
Written on 31 Aug, 2010 at 20:06 in Cement, Miscellaneous, Practical Guide, Tips | viewed 26 views times and users have made 1 comment so far
ENVIRONMENTAL EXPOSURE CONDITIONS OF STRUCTURES Sl. No. Environment Exposure Conditions i Mild Concrete surfaces protected against weather or aggressive conditions, except those situated in coastal areas ii Moderate Concrete surface sheltered from severe rain or freezing whilst wet; concrete exposed... (Continue reading)
PHYSICAL REQUIREMENTS FOR ADMIXTURES
Written on 31 Aug, 2010 at 12:53 in Admixtures, Miscellaneous, Practical Guide, Tips | viewed 25 views times and users have made 1 comment so far
Physical requirements for accelerating, retarding, water reducing and air-entraining admixtures Note: AA – Accelerating Admixture RA – Retarding Admixture WRA – Water-reducing Admixture AEA – Air-entraining admixture NSA- Super plasticizing admixture (Normal) RSA- Super plasticizing admixture (retarding) Requirement... (Continue reading)
PROPERTIES OF AGGREGATES
Written on 31 Aug, 2010 at 0:19 in Aggregate, Material Testing, Miscellaneous, Practical Guide | viewed 18 views times and users have made 0 comments so far
1. AGGREGATES: BULK DENSITY, SPECIFIC GRAVITY AND VOIDS BULK DENSITY River sand Fine 1.44 Medium 1.52 Coarse 1.60 Beach or river shingle 1.60 Broken stone 1.60 Stone screenings 1.44 Broken... (Continue reading)
GRADING LIMITS FOR AGGREGATES
Written on 30 Aug, 2010 at 22:08 in Aggregate, Material Testing, Miscellaneous, Practical Guide, Recommended Mix | viewed 19 views times and users have made 0 comments so far
GRADING LIMIT FOR SINGLE – SIZED AGGREGATES (Clause 4.1 and 4.2 of IS: 383- 1970) IS Sieve Percentage passing for single sized aggregates of nominal size(mm) 63 mm 40 mm 20 mm 16 mm 12.5 mm 10 mm 80 mm... (Continue reading)
PRODUCTION OF COLOURED FINISHES WITH WHITE CEMENT
Written on 30 Aug, 2010 at 20:15 in Design, Miscellaneous, Practical Guide, Tips, Work Procedure | viewed 12 views times and users have made 1 comment so far
PRODUCTION OF COLOURED FINISHES WITH WHITE CEMENT Colours Desired Commercial Names of Colours Approx. Qty required (kg per bag of cement) Light Shade Medium Shade Greys, blue-black and black Lampblack*, or carbon black* or black oxide of manganese* or mineral... (Continue reading)
PROPERTIES OF VARIOUS GRADES OF ORDINARY PORTLAND CEMENT (OPC)
Written on 30 Aug, 2010 at 18:47 in Cement, Material Testing, Miscellaneous, Practical Guide | viewed 15 views times and users have made 1 comment so far
Physical and Chemical Properties of Various Grades of Ordinary Portland Cement (OPC) Type of Cement 33 Grade (IS: 269-1989) 43 Grade (IS:8112-1989) 53 Grade (IS: 12269-1987) PHYSICAL PROPERITES Minimum... (Continue reading)
DEGREE OF WORKABILITY FOR DIFFERENT PLACING CONDITIONS
Written on 30 Aug, 2010 at 17:40 in Concrete, Material Testing, Miscellaneous, Mix Design, Practical Guide, Quality Control, Recommended Mix | viewed 30 views times and users have made 1 comment so far
DEGREE OF WORKABILITY FOR DIFFERENT PLACING CONDITIONS Placing Condition Degree of Workability Slump (mm) Binding concrete, Shallow Sections Pavement using pavers Very low Use compacting factor test as per IS: 1199 Mass concrete, Lightly reinforced sections in slabs, beams,... (Continue reading)
CAUSE & IMPORTANCE OF LIQUIFACTION
Written on 19 Aug, 2010 at 10:59 in Geotechnical, Liquifaction, Miscellaneous, Soil | viewed 62 views times and users have made 1 comment so far
A deposit of soil, by nature, is able to be compacted through the rearrangement of the particles within; but, water is incompressible as a property. As a result, any increase to the stress acting on a saturated soil-provided it occurs... (Continue reading)
SOIL LIQUIFACTION
Written on 19 Aug, 2010 at 9:49 in Geotechnical, Liquifaction, Miscellaneous, Soil | viewed 57 views times and users have made 1 comment so far
WHAT IS LIQUIFACTION? During heavy ground shaking by earthquakes, liquefaction occurs when the pressure exerted by the water present in saturated soil becomes so great that the soil particles become ‘suspended’ in the water. A soil deposit that is liquefied... (Continue reading)
ELEMENTS OF EARTH FILL DAMS
Written on 12 May, 2010 at 3:00 in Dams, Hydraulic Structures, Miscellaneous, Water Resources | viewed 507 views times and users have made 1 comment so far
Some Elements of Earth Fill Dams 1. Crest of dam: The crest width of dams should be sufficient to keep the seepage line within the dam, when the reservoir is full. The crest width of the dam if road is... (Continue reading)
FAILURE OF EARTHFILL DAMS
Written on 11 May, 2010 at 12:05 in Dams, Failure, Hydraulic Structures, Miscellaneous, Water Resources | viewed 439 views times and users have made 0 comments so far
Some causes of failure of earthfill dams Like most of engineering structures, earth dams may fail due to faulty design, improper construction and poor maintenance practices, etc The various causes of failure may be classified as: a) Hydraulic failure b)... (Continue reading)
EMBANKMENT MATERIALS
Written on 11 May, 2010 at 11:54 in Dams, Hydraulic Structures, Miscellaneous, Water Resources | viewed 305 views times and users have made 0 comments so far
Embankment Materials a. Earth-fill materials. (1) While most soils can be used for earth-fill construction as long as they are insoluble and substantially inorganic, typical rock flours and clays with liquid limits above 80 should generally be avoided. The term... (Continue reading)
CRITERIA FOR DESIGN OF EARTH DAMS
Written on 11 May, 2010 at 11:45 in Dams, Hydraulic Structures, Miscellaneous, Water Resources | viewed 342 views times and users have made 0 comments so far
The criteria for the design of earth dams are: 1. Sufficient spillway capacity and freeboard are provided so that there is no danger of overtopping of the dam 2. Seepage flow through the embankment is controlled so that the amount... (Continue reading)
EARTHFILL DAMS & ITS CLASSIFICATION
Written on 11 May, 2010 at 11:37 in Dams, Hydraulic Structures, Miscellaneous, Water Resources | viewed 401 views times and users have made 0 comments so far
Earthfill dams are the most common type of dam built to any height. They are designed as a non-overflow section with separate spillway. The reason for such wide spread use of earthfill dams are: The foundation requirements are not as... (Continue reading)
GRAIN SIZE ANALYSIS
Written on 10 May, 2010 at 11:45 in Aggregate, Material Testing, Miscellaneous, Practical Guide | viewed 592 views times and users have made 0 comments so far
AIM To determine the particle size distribution of the given fine aggregate and to determine ,the fineness modulus,the effective size and uniformly coefficent . THEORY Fine aggregate is the sand used in mortars. Coarse aggregate is the broken stone used... (Continue reading)
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