kSIST-TS FprCEN/TS 17693-1:2021

SLOVENSKI STANDARD
kSIST-TS FprCEN/TS 17693-1:2021
01-september-2021

Zemeljska dela - Preskusi obdelave tal - 1. del: Določevanje apna za stabilizacijo

Earthworks - Soil treatment tests - Part 1: pH-test for determination of the lime

requirement of soils for stabilization (Lime Fixation Point LFP, Lime Modification

Terrassements - Essais de traitement de sol - Partie 1 : Essai pH pour la détermination

du besoin en chaux pour la stabilisation des sols (Point de fixation de la chaux LFP,

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

Terrassements - Essais de traitement de sol - Partie 1 : Erdarbeiten - Prüfungen zur Bodenbehandlung - Teil 1:

Essai pH pour la détermination du besoin en chaux pH Test zur Bestimmung des Kalkhydratbedarfs von

pour la stabilisation des sols (Point de fixation de la Böden zur Stabilisierung (Bestimmung des minimalen

chaux LFP, Optimum de modification de la chaux LMO) Kalkhydratgehalts (LFP) und des optimalen

This draft Technical Specification is submitted to CEN members for Vote. It has been drawn up by the Technical Committee

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are

Warning : This document is not a Technical Specification. It is distributed for review and comments. It is subject to change

© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. FprCEN/TS 17693-1:2021 E

European foreword ............................................................................................................................................ 3

Introduction .......................................................................................................................................................... 4

1 Scope .......................................................................................................................................................... 5

2 Normative references .......................................................................................................................... 5

3 Terms, definitions, abbreviations and symbols ........................................................................ 5

3.1 Terms ........................................................................................................................................................ 5

3.2 Abbreviations and symbols ............................................................................................................... 6

4 Principle of the test .............................................................................................................................. 7

5 Reagents ................................................................................................................................................... 7

5.1 Lime ........................................................................................................................................................... 7

5.2 Water ......................................................................................................................................................... 7

6 Apparatus ................................................................................................................................................ 7

7 Preparation of the test portions ...................................................................................................... 8

7.1 If D is greater than 50 mm ............................................................................................................ 8

7.2 If D is ranging between 5 mm and 50 mm .............................................................................. 8

7.3 If D is smaller than or equal at 5 mm ........................................................................................ 8

8 Test procedure ....................................................................................................................................... 9

8.1 Water calibration of the pH-meter ................................................................................................. 9

8.2 Main test procedure ............................................................................................................................. 9

8.3 Alternative test procedure .............................................................................................................. 10

9 Expression of results and determination of the LFP (LMO) of the soil ............................ 10

9.1 General.................................................................................................................................................... 10

9.2 pH vs added lime graph .................................................................................................................... 10

9.3 Conversion of quicklime to hydrated lime concentration ................................................... 11

9.4 Abnormal or out of range pH results ........................................................................................... 11

10 Test report ............................................................................................................................................. 11

Annex A (informative) Example of a test data sheet ........................................................................... 13

Bibliography ....................................................................................................................................................... 16

This document (FprCEN/TS 17693-1:2021) has been prepared by Technical Committee CEN/TC 396

This document describes the reference method for the determination of the lime fixation point (LFP) of

LFP (LMO) is the theoretical lime content from which can occur the setting and hardening of soil-lime

mix, resulting from the pozzolanic reactions due to the combination of lime with clay components of the

It can be considered as the optimal lime amount to be added in a soil in order to perform its improvement,

and the minimal lime amount from which stabilization can occur (terms “improvement” and

This document describes the reference method for the determination of the lime fixation point (LFP) in

The test consists in measuring the lowest quantity of lime to be added in a soil suspension in water that

will result in a pH value of the soil-lime mix suspension of 12,4, measured at 25 °C ± 1 °C.

This test method cannot be used to provide information about soil reactivity with lime, or other

performance values (mechanical characteristics of soil-lime mixes) applicable for improvement or

stabilization purposes. Those performance tests will be conducted in a laboratory from a specific study,

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 459-1, Building lime - Part 1: Definitions, specifications and conformity criteria

ISO 3310-1, Test sieves - Technical requirements and testing - Part 1: Test sieves of metal wire cloth

ISO 3310-2, Test sieves - Technical requirements and testing - Part 2: Test sieves of perforated metal plate

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

general term which includes quicklime, hydrated lime, lime slurry (“milk of lime”), defined and specified

amount of added lime in the soil, expressed as the percentage of lime mass to the dry mass of the soil, or

expressed as the percentage to the sum of dry mass of the soil and added lime mass

operation which modifies the physical properties of a material - such as water content, plasticity, water

and frost susceptibility, compactibility and swelling potential - by the addition of lime (quicklime,

Note 1 to entry: The quantity of lime added may not be sufficient to induce significant permanent properties

operation consisting in obtaining an homogeneous mixture of soil with lime, and optionally with water,

which properly compacted significantly changes (generally in the medium or long term) the

characteristics of the soil in a way that renders it stable, particularly with respect to the action of water

the theoretical lime content from which can occur the setting and hardening of soil-lime mix, resulting

from the pozzolanic reactions due to the combination of lime with clay components of the soil

Note 1 to entry: It can be considered as the optimal lime amount to be added in a soil in order to perform its

improvement, and the minimal lime amount from which stabilization can occur. In the rest of this document, the

figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower

Note 1 to entry: The pH is equal to −log where is the hydrogen ion concentration in moles per litre

cLFP,soil+lime LFP : percentage of lime by dry mass of soil and amount of added lime dimensionless (%)

Increments of lime (quicklime, hydrated lime or lime slurry of known purities or concentrations) are