Home > Quality Control & IS Codes

Procedure for Determination Setting Time of Cement

Er. Parbhakar Dwivedi
0
 

       

Theory:

When water is mixed with cement to form a paste, reaction starts. In its pure pore, the finely ground cement is extremely sensitive to water. Out of the three main compounds viz. C3 A, C3 S and C2 S, the C3 A reacts quickly with water to produce jelly-like compound which starts solidifying. This action of changing from a fluid state to a solid state is called ‘Setting’ and should not be confused ‘Hardening’

During the next stage of hydration, cement paste state hardening owing to the reaction of C2 S and C2 S and the paste gains strength. In the first few minutes, the setting action is more preforming and after some time hardening action becomes rapid.

In practice, such solidifying action or loss of plasticity is required to be delayed, because time is needed for mixing transporting and placing of concrete into final position before the mix loses its plasticity due to setting action.

It is usually specified that the plastic concrete should be placed and consolidated before initial set has occurred, it should not then be disturbed until concrete has hardened. This initial setting should not be too small and therefore, the standards specify minimum initial setting time.

Once initial stiffening of concrete has taken place it is desirable that it should harden or strength as rapidly as possible, so that there is minimum of delay before shuttering can be removed and risk of frost-damage minimized. Standards, therefore, specify maximum value of final se time.

It is not possible, however, in practice to exactly locate the initial setting time and final se time. The Indian standards have selected two arbitrary points which relate strength of cement time from adding water.

‘Initial setting time’ is defined as the period elapsing between the time when the water is added to the cement and the time at which the needle of 1 mm square section fails to the test block to a depth of about 5 mm from the bottom of mould. 30 minutes is the minimum setting time specified by ISI for ordinary, hardening cement and other cements and 60 mm low heat cement (see Table).

The ‘final setting time’ is defined as the period elapsing between the time when the water is to the cement and the time at which the needle of 1 mm square whit 5 mm dia attachment (the Fig. 8.1) makes an impression on the test block, while the attachment fails to make impression on the test block. 600 minutes is the maximum time specified for final set for all the mentioned Portland cement.

Aim: To determine initial and final setting time of Cement.

Significance: This test given a judgment about the available time for transportation placing of concrete, commencement of curing and stripping.

Apparatus

  1. Vicat apparatus, (Mould dia: 80 mm, Height: 40 mm)
  2. Weights & Balance
  3. Trowel
  4. Initial & Final setting time needle
  5. Time watch

Apparatus

  1. Take 400 gm of cement and 85% water required for making cement paste of normal consistency.
  2. The paste shall be gauged and filled into the vicat mould in specified manner within 3-5 minutes
  3. Start the time watch the moment water is added to the cement The temp of water and that of the test room at the time of gauging temperature shall be within 27 +/- 2 °C
  4. When the needle for Initial setting time, brought in contact with the top surface and released quickly, fails to penetrate the paste block for 5 to 7 mm measure from the bottom of the mould is taken as Initial
  5. When the needle for Final setting time, placed gently on the surface attachment fails to do so, is taken as Final setting time

Water Observation Table

Weight of Cement Water Initial setting time minute Final setting
(gm) (Ltr) Minute

Limit : As per IS 4031 (Part-5) - 1988

  1. Initial setting time not less than 30 minutes
  2. Final setting time not more than 600 minutes

FORMAT FOR INITIAL & FINAL SETTING TEST OF CEMENT IN SEPARATE TOPICS

Sponsored

PD Consulting Engineers Pvt. Ltd. Transforming construction for a new generation "Cost, Quality & Project management"

QS & Cost management, Bill Checking / Audit, Technical Auditors, Valuation, Contract and Tendering, Project Management, Project Planning, Quality Control, Consulting Engineers, Structural Consultancy

Close


Comment:

Name:

Email:

Civil N Construction Blog



Relevant Topics

Tests for stones

Tests For Limestone

Tests Of Mortar

Specifications For Water (IS 456)

Determine Flexure Strength Of Concrete

Procedure For Test Of Silt Content In Sand

Determination Of Dry Density Of Soil Core Cutter Method

Procedure For Determination Of Aggregate Crushing Value

Procedure For Slump Test For Concrete

Determination Of Water Absorption Coarse Aggregate Format

Initial And Final Setting Test Of Cement Format

Concrete Quantite Register Grade Wise Summary Format

Procedure For Determination Of Water Content In Soil

Procedure For Determination Of Elongation Index Of Coarse Aggregate

Aggregate Crushing Value Test Format

Water Test Report Register Format

Testing Of Cement Testing Of Cement Field Test

Procedure For Sieve Analysis Of Fine Aggregates

Compressive Strength Test Of Bricks Format

Efflorescence Status Of Bricks Format

Procedure For Determination Of Flakiness Index Of Coarse Aggregate

Sieve Analysis For Coarse Aggregate Format

Procedure For Determination Standard Consistency Of Cement

Method Of Sampling Of Cement

Verification Of Compression Testing Machine Oil Leakage

Rolling Margin Register Format

Determination Of Specific Geavity Fine Aggregate Format

Concrete Quantity Register Pouring Details Format

Procedure For Sieve Analysis Of Coarse Aggregates

Verification Of Cube Moulds

Dimension Test Of Bricks Format

Slump Ans Temp Register For Concrete Format

Procedure For Filling Cubes

Consistency Of Standared Cement Paste Format

Rolling Margin Register Total Quantity Format

Procedure For Determination Of Aggregate Impact Value

Determination Of Specific Gravity And Water Absorption Of Fine Aggregates

Procedure For Compressive Strength Testing For Concrete

Incoming Material Receiving Register Format

Determination Of Specific Gravity And Water Absorption Of Coarse Aggregate

Internal Qa And Qc Audit Observation Format

Verification Of Sieves

Verification Of Mechanical Weigh Balance

Determination Of Water Absorption Of Bricks

List Of Site Laboratory Equipment

Flakiness Index Of Coarse Aggregate Format

Determination Of Efflorescence Of Bricks

Determination Of Specific Gravity Coarse Aggregate Format

Procedure For Determination Fineness Of Cement

Concrete Cube Register Format

Concrete Quantity Register Month Wise Summary Format

Water Absorption Test Of Bricks Format

Moisture Correction Format

List Of Records To Be Maintained Qc Qa

Fineness Test Of Cement Format

Procedure For Determination Compressive Strength Test Of Cement

Aggregate Impact Value Test Format

Elongation Index Of Coarse Aggregate Format

Procedure For Determination Of Compressive Strength Of Bricks

Material Test Plan Civil Works

Soundness Test Of Cement Format

Procedure For Determination Setting Time Of Cement

Fineness Test Of Flyash Format

Field Dry Density Of Soil By Core Cutter Method Format

Bend And Reband Test Of Steel Format

Determination Of Water Absorption Fine Aggregate Format

Compressive Strength Test Of Cement Format

Sieve Analysis For Fine Aggregate Format

Verification Of Pan Balance

Calibration Plan

IS Codes for landscape developement and IS Codes for approaches to sustainability

IS Codes for steel and its alloys

IS Codes for stones

is-codes-for-structural-sections

IS Codes for threaded fasteners rivets and nails

IS Codes for timber bamboo and other lignocellulosic building materrials

IS Codes for waterproofing and damp proofing materials

IS Codes for building chemicals

IS Codes for building lime & products

IS Codes for clay & stabilized soil products

IS Codes for doors windows & ventilators

IS Codes for floor covering roofing & other finishes

IS Codes for glass & mortar

IS Codes for paints and allied products

IS Codes for polymers plastics & geosynthetics geotextiles

IS Codes gypsum based materials

IS Codes Safety and IS Codes For Demolition and Dismantling

IS Codes for Roofing

IS Codes for Steel Work

IS Codes for Finishing

IS Codes for Flooring

IS Codes for Stone Work

IS Codes for Wood Work

IS Codes for Brick Work

IS Codes for RCC Work

IS Codes for ConcreteWork

IS Codes for Mortar

IS Codes for composite matrix products

IS Codes for cement & concrete

IS Codes for builder's hardware

IS Codes for aluminium & other light metals & their alloys

Quality Control (QC), Quality Assurance (QA), Quality Control Utilizes Tools and techniques

Quality Assurance manual (QAM), Quality Assurance Plan (QAP)

Quality Audits, Quality Assurance Formulations

Quality Control Method Statement, Pre- Construction Stage, Construction Stage, Post- Construction Stage

Quality Control Plan, Quality Control System, Quality control of materials, Quality control of workers, Quality control of execution

IS Codes for air conditioning heating and mechanical ventilation

IS Codes for drainage and sanitation

IS Codes for electrical and allied installations

is codes for firefighting and life safety

IS Codes for lighting and natural ventilation

IS Codes for solid waste management and IS Codes for gas supply

is codes for thermal insulation materials

IS Codes for water supply

is codes for welding electrodes and wires

IS Codes for electrical wiring fittings and accessories

IS Codes for conductors & cables

IS Codes for sanitary appliances and water fittings

Sponsored

PD Consulting Engineers Pvt. Ltd. Transforming construction for a new generation "Cost, Quality & Project management"

QS & Cost management, Bill Checking / Audit, Technical Auditors, Valuation, Contract and Tendering, Project Management, Project Planning, Quality Control, Consulting Engineers, Structural Consultancy

Close