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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)
SOUNDNESS OF CEMENT
Written on 5 May, 2010 at 10:46 in Concrete, Material Testing, Miscellaneous, Practical Guide | viewed 326 views times and users have made 0 comments so far
AIM To determine the soundness of cement by the Le-chatelier method APPARATUS Le- chatelier mould The mould consist of a small split cylinder of spring brass or other suitable metal of 0.5mm thickness forming of a mould 30mm internal... (Continue reading)
COMPRESSIVE STRENGTH TEST ON CONCRETE CYLINDERS
Written on 5 May, 2010 at 10:25 in Concrete, Material Testing, Miscellaneous, Practical Guide | viewed 603 views times and users have made 0 comments so far
AIM To determine the compressive strength of concrete cylinders. APPARATUS Compression testing machine, cylinder mould of 150mm diameter and 300mm height, weighing balance. PROCEDURE (i) Cast the cylinder and cure for 28 days. (ii) Takeout the specimen from the curing... (Continue reading)
SULPHATE ATTACK IN CONCRETE AND ITS PREVENTION
Written on 13 Apr, 2010 at 9:49 in Concrete, Miscellaneous, Sulphate Attack | viewed 929 views times and users have made 3 comments so far
Sulfate attack is a chemical breakdown mechanism where sulfate ions attack components of the cement paste. The compounds responsible for sulfate attack are water-soluble sulfate-containing salts, such as alkali-earth (calcium, magnesium) and alkali (sodium, potassium) sulfates that are capable of... (Continue reading)
BIOCONCRETE
Written on 8 Apr, 2010 at 14:07 in Concrete, Miscellaneous, Special Concrete | viewed 303 views times and users have made 1 comment so far
Why Bioconcrete? Problems in normal concrete: Cement, main ingredient = ‘Non-sustainable’ Yearly consumption : - millions of tons of cement in a single country - millions of tons of sand - millions of tons of gravel Environmental impact: 10%of world... (Continue reading)
DETERMINATION OF MODULUS OF ELASTICITY OF CONCRETE
Written on 7 Apr, 2010 at 8:59 in Concrete, Material Testing, Practical Guide | viewed 638 views times and users have made 0 comments so far
AIM To determine the modulus of elasticity of concrete. SPECIMEN Concrete calender 15 cm diameter and 30cm long PROCDURE Setting Up of Compressometer (i) Assemble the top and bottom frame by keeping the spacers in position. (ii) Keep the pivot... (Continue reading)
SPLITTING TENSILE STRENGTH TEST ON CONCRETE CYLENDERS
Written on 7 Apr, 2010 at 1:39 in Concrete, Material Testing, Miscellaneous, Practical Guide | viewed 934 views times and users have made 2 comments so far
AIM To determine the splitting tensile of concrete. APPARATUS Compression testing machine, two packing strips of plywood 30 cm long and 12mm wide. SAMPLING MOULDS The cylinder mould shall is of metal ,3mm thick. Each mould is capable of being... (Continue reading)
STACKED LOG CONSTRUCTION
Written on 1 Apr, 2010 at 13:26 in Constrution, Miscellaneous, Types | viewed 298 views times and users have made 2 comments so far
Log houses originated in Europe where they were hastily erected as hunting cabins. Stacked log homes today are elaborate structures worth several hundred thousand dollars in some cases. Coniferous trees are ideal for constructing stacked log houses are the timber... (Continue reading)
PAPERCRETE
Written on 1 Apr, 2010 at 11:04 in Concrete, Miscellaneous, Special Concrete | viewed 468 views times and users have made 0 comments so far
PaperCrete is essentially a type of industrial strength paper maché made with paper and cardboard, sand and Portland cement. There are many varieties of PaperCrete possible. Essentially, the constituents when mixed in different proportions result in PaperCrete of varying... (Continue reading)
TESTS ON HARDENED CONCRETE
Written on 27 Mar, 2010 at 17:13 in Concrete, Hardened Concrete, Material Testing, Miscellaneous | viewed 922 views times and users have made 3 comments so far
Properties of Hardened Concrete Early volume change Creep Properties Permeability Stress-Strain Relation I. Early Volume Change (Shrinkage) What is the problem? >> May result in cracking Plastic Shrinkage Due to water loss from fresh paste by evaporation or from suction... (Continue reading)
PRECAST CEMENT CONCRETE BLOCKS CONSTRUCTION
Written on 20 Mar, 2010 at 1:15 in Concrete, Constrution, Miscellaneous, Precast Concrete | viewed 741 views times and users have made 1 comment so far
MANUFACTURING 1 Mould:- Moulds shall be fabricated using mild steel plates and mild steel angles for stiffening the plates. The mould should be either fixed type or (box with four side walls fixed at corners, and top and bottom open)... (Continue reading)
ADVERSE EFFECT OF CONCRETE ADMIXTURE
Written on 19 Mar, 2010 at 17:50 in Admixtures, Concrete, Miscellaneous | viewed 198 views times and users have made 0 comments so far
Adverse effects due to improper application : Admixtures are used extensively to produce high workable, high strength high performance and highly durable concrete with minimum cost. However, these admixtures are not used judiciously and with the poor knowledge of admixture... (Continue reading)
QUALITY REQUIREMENT OF ADMIXTURE
Written on 19 Mar, 2010 at 17:47 in Admixtures, Concrete, Miscellaneous | viewed 102 views times and users have made 0 comments so far
Quality Requirement of Admixture When the admixtures are said to be compatible with concrete, it should meet the following quality requirement; i) Characteristics of admixture : The data sheet shall give the characteristic details such as type of admixtures, available... (Continue reading)
SELECTION & SPECIFIC APPLICATIONS OF CONCRETE ADMIXTURES
Written on 19 Mar, 2010 at 17:45 in Admixtures, Concrete, Miscellaneous | viewed 313 views times and users have made 0 comments so far
Admixtures shall be selected carefully to alter the concrete properties to the requirement of job at site and shall be used judiciously according to specification and method of application to avoid adverse effect on concrete properties at fresh and hardened... (Continue reading)
PERMEABILITY OF CONCRETE
Written on 19 Mar, 2010 at 17:37 in Concrete, Cracks, Miscellaneous, Repair | viewed 152 views times and users have made 0 comments so far
If concrete is impermeable, corrosive agents cannot penetrate and attack it. Concrete basically has two types of pores, which determine permeability. These are capillary pores (with a diameter varying between 0.01 to 10 micron) in the cement, paste which coats... (Continue reading)
PROPERTIES OF CONCRETE:
Written on 16 Mar, 2010 at 19:19 in Concrete, Properties | viewed 605 views times and users have made 1 comment so far
Concrete is known by its grade which is designated as M15, M20 etc. in which letter M refers to concrete mix and number 15, 20 denotes the specified compressive strength (fck) of 150mm cube at 28 days, expressed in N/mm2.... (Continue reading)
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(0.00 out of 5) - TESTS ON HARDENED CONCRETE (0.00 out of 5)
- PAPERCRETE (0.00 out of 5)
- SPLITTING TENSILE STRENGTH TEST ON CONCRETE CYLENDERS (0.00 out of 5)
- DETERMINATION OF MODULUS OF ELASTICITY OF CONCRETE (0.00 out of 5)
- BIOCONCRETE (0.00 out of 5)
- SULPHATE ATTACK IN CONCRETE AND ITS PREVENTION (0.00 out of 5)
- COMPRESSIVE STRENGTH TEST ON CONCRETE CYLINDERS (0.00 out of 5)
- SOUNDNESS OF CEMENT (0.00 out of 5)
- DEGREE OF WORKABILITY FOR DIFFERENT PLACING CONDITIONS (0.00 out of 5)
- Fresh Concrete - 0 votes
- TESTS ON HARDENED CONCRETE - 0 votes
- PAPERCRETE - 0 votes
- SPLITTING TENSILE STRENGTH TEST ON CONCRETE CYLENDERS - 0 votes
- DETERMINATION OF MODULUS OF ELASTICITY OF CONCRETE - 0 votes
- BIOCONCRETE - 0 votes
- SULPHATE ATTACK IN CONCRETE AND ITS PREVENTION - 0 votes
- COMPRESSIVE STRENGTH TEST ON CONCRETE CYLINDERS - 0 votes
- SOUNDNESS OF CEMENT - 0 votes
- DEGREE OF WORKABILITY FOR DIFFERENT PLACING CONDITIONS - 0 votes