ISO 29582-2-2009 Methods of testing cement - Determination of the heat of hydration - Part 2 Semi-adiabatic method《水泥试验方法 水化热的测定 第2部分 半隔热法》.pdf

《ISO 29582-2-2009 Methods of testing cement - Determination of the heat of hydration - Part 2 Semi-adiabatic method《水泥试验方法 水化热的测定 第2部分 半隔热法》.pdf》由会员分享，可在线阅读，更多相关《ISO 29582-2-2009 Methods of testing cement - Determination of the heat of hydration - Part 2 Semi-adiabatic method《水泥试验方法 水化热的测定 第2部分 半隔热法》.pdf（22页珍藏版）》请在麦多课文档分享上搜索。

1、 Reference numberISO 29582-2:2009(E)ISO 2009INTERNATIONAL STANDARD ISO29582-2First edition2009-07-15Methods of testing cement Determination of the heat of hydration Part 2: Semi-adiabatic method Mthodes dessai des ciments Dtermination de la chaleur dhydratation Partie 2: Mthode semi-adiabatique ISO

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5、en below. COPYRIGHT PROTECTED DOCUMENT ISO 2009 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the

6、 address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reservedISO 29582-2:2009(E) ISO 2009 All rig

7、hts reserved iiiContents Page Foreword iv 1 Scope . 1 2 Normative references . 1 3 Principle. 1 4 Apparatus 2 5 Determination of the heat of hydration. 4 6 Calculation of the heat of hydration . 6 7 Expression of results . 8 8 Precision 8 9 Test report . 8 Annex A (normative) Calibration of the calo

8、rimeter. 9 Annex B (informative) Worked example of determination of heat of hydration 14 Bibliography . 17 ISO 29582-2:2009(E) iv ISO 2009 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies).

9、The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-g

10、overnmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2

11、. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a

12、vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 29582-2 was prepared by Technical Committee ISO/TC 74, Cement and lime. ISO 29582 consists

13、of the following parts, under the general title Methods of testing cement Determination of the heat of hydration: Part 1: Solution method Part 2: Semi-adiabatic method INTERNATIONAL STANDARD ISO 29582-2:2009(E) ISO 2009 All rights reserved 1Methods of testing cement Determination of the heat of hydr

14、ation Part 2: Semi-adiabatic method 1 Scope This part of ISO 29582 describes a method of measuring the heat of hydration of cements by means of semi-adiabatic calorimetry, also known as the Langavant method. The aim of the test is the continuous measurement of the heat of hydration of cement during

15、the first few days. The heat of hydration is expressed in joules per gram of cement. This part of ISO 29582 is applicable to all cements and hydraulic binders, whatever their chemical composition, with the exception of quick-setting cements. NOTE 1 An alternative procedure, called the solution metho

16、d, is described in ISO 29582-1. Either procedure can be used independently. NOTE 2 It has been demonstrated that the best correlation between the two methods is obtained at 41 h for the semi-adiabatic method in this part of ISO 29582 compared with 7 d for the heat of solution method in ISO 29582-1.

17、2 Normative references The following referenced documents are indispensable for the application 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. ISO 6791), Cement Test met

18、hods Determination of strength EN 197-1, Cement Part 1: Composition, specifications and conformity criteria for common cements EN 573-3, Aluminium and aluminium alloys Chemical composition and form of wrought products Part 3: Chemical composition and form of products 3 Principle The semi-adiabatic m

19、ethod consists of introducing a sample of freshly made mortar into a calorimeter in order to determine the quantity of heat emitted in accordance with the development of the temperature. At a given point in time, the heat of hydration of the cement contained in the sample is equal to the sum of the

20、heat accumulated in the calorimeter and the heat lost into the ambient atmosphere throughout the period of the test. 1) To be published. (Revision of ISO 679:1989) ISO 29582-2:2009(E) 2 ISO 2009 All rights reservedThe temperature rise of the mortar is compared with the temperature of an inert sample

21、 in a reference calorimeter. The temperature rise depends mainly on the characteristics of the cement and is normally between 10 K and 50 K. 4 Apparatus 4.1 Calorimeter, consisting of an insulated flask sealed with an insulated stopper and encased in a rigid casing which acts as its support (see Fig

22、ure 1). The calorimeter shall have the following performance characteristics. The coefficient of total heat loss of the calorimeter shall not exceed 100 Jh1K1for a temperature rise of 20 K. This value, together with the thermal capacity, shall be determined in accordance with the calibration procedu

23、re given in A.3.1. Recalibration is necessary at least every four years or after 200 tests; whenever deterioration occurs in the calorimeter or an insulating component. In order not to impair the insulation of the calorimeter, the temperature of the mortar under test shall not exceed 75 C. Both the

24、calorimeter used for the test and that for the reference (see 4.2) shall have the following construction and characteristics. a) Flask, insulated (e.g. Dewar flask), made of silver-plated borosilicate glass, cylindrical in shape with a hemispherical bottom. The internal dimensions shall be approxima

25、tely 95 mm in diameter and 280 mm in depth and the external diameter, approximately 120 mm. A rubber disc of approximately 85 mm in diameter and 20 mm thick shall be placed at the bottom of the flask to act as support for the sample container and evenly distribute the load on the glass wall. b) Casi

26、ng, very rigid, having a sufficiently wide base to ensure good stability of the whole unit (e.g. made of duralumin, 3 mm thick). The flask shall be separated from the lateral walls of the casing by an air space of approximately 5 mm and rest on a support 40 mm to 50 mm thick made of a material havin

27、g low thermal conductivity (e.g. expanded polystyrene). The upper edge of the flask shall be protected by a rubber gasket above which, and in contact with it, shall be a ring not less than 5 mm thick, made of a low-thermal-conductivity material, fixed to the calorimeter casing. The ring shall serve

28、to locate the flask in position and provide a bearing surface for the stopper so as to ensure the tightness of the locking device. c) Stopper, insulating, made of the following three parts. The lower part, which is inserted into the flask and which serves to provide a maximum prevention of heat loss

29、 into the external atmosphere. It shall be cylindrical in shape, of diameter equal to the internal diameter of the flask, and approximately 50 mm thick. It shall be made of expanded polystyrene (class 20 kg/m3approximately) or of another material of similar thermal characteristics. Its base can be p

30、rotected by a layer of plastic (e.g. polymethyl methacrylate), approximately 2 mm thick. The central part, which serves to ensure the tightness of the calorimeter whilst contributing to the reduction of losses, shall consist of a foam rubber disc 120 mm in diameter. The upper part, which is intended

31、 to ensure the correct and consistent positioning of the stopper unit against the Dewar flask, shall consist of a rigid casing incorporating a snap locking device in such a way as to compress the foam rubber central part ensuring the tight fitting of the stopper. ISO 29582-2:2009(E) ISO 2009 All rig

32、hts reserved 34.2 Reference calorimeter, having the same construction and characteristics as the test calorimeter (4.1). It shall contain a mortar box in which there is a sample of mortar mixed at least 12 months previously and which is considered to be inert. Where an inert sample is not available,

33、 an aluminium cylinder of the same thermal capacity as the mortar box and mortar sample may be used. Key 1 platinum resistance thermometer 6 dewar flask 2 gasket 7 mortar sample 3 insulating stopper 8 rubber disc 4 mortar box 9 rigid casing 5 thermometer pocket 10 oil Figure 1 Typical calorimeter IS

34、O 29582-2:2009(E) 4 ISO 2009 All rights reserved4.3 Thermometers, platinum resistance, for the reference calorimeter and each test calorimeter, having a minimum range of 19 C to 75 C. If the conductors of the electrical resistor are made of copper, they shall have a cross-sectional area not greater

35、than 0,25 mm2in the part which passes through the stopper. If they are made of another metal, the total thermal resistance per centimetre of conductor shall be greater than 0,10 KmW1(thermal resistance equivalent to that of a copper conductor with a sectional area of 0,25 mm2and 1 cm long). The ther

36、mal output of the thermometer shall not exceed 3 mW. Direct current supply, which constitutes a power input, shall be avoided if the thermal output exceeds 0,2 mW. It is advisable to ensure the accuracy of the overall temperature measuring and recording equipment. The temperature of the test sample

37、shall be measured to an accuracy of 0,3 C. Where the calorimeter is calibrated in situ with the conductors used for the tests of heat of hydration, the total cross-sectional area of the conductors will be a maximum of 0,80 mm2(four wires, 0,5 mm in diameter), but shall be such that the coefficient o

38、f heat loss of the calorimeter is less than 100 Jh1K1for a temperature rise of 20 K; see A.3.1.1. The protective sheath of these conductors shall be made of a material having a low thermal conductivity. 4.4 Mortar box, consisting of a cylindrical container fitted with a cover, having a volume of app

39、roximately 800 cm3, designed to contain the sample of mortar under test. The mortar box, discarded after each test, shall be impermeable to water vapour. This shall be checked in use by weighing the mortar box after each test (see 5.2.3). It shall be made of electrically counter-welded tin plate wit

40、h a nominal thickness of 0,3 mm and shall have a diameter of approximately 80 mm and a height of approximately 165 mm. Its height shall be designed to provide an air space of approximately 10 mm between the top of the mortar box and the stopper. The lid of the mortar box shall be fitted with a centr

41、al thermometer pocket in the form of a cylindrical pipe, closed at its base. The internal diameter of the pocket shall be slightly greater than that of the thermometer. Its length shall be approximately 100 mm to 120 mm and enable it to extend to the centre of the test sample. 4.5 Temperature-record

42、ing apparatus, capable of recording the measurements taken by each thermometer. 4.6 Mortar mixing apparatus, conforming to ISO 679. 5 Determination of the heat of hydration 5.1 Laboratory The laboratory where the mortar is mixed shall be maintained at a temperature of (20 2) C. The room where the te

43、st is carried out shall be maintained at a temperature of (20,0 1,0) C. The measured temperature of the reference calorimeter shall be considered to be the ambient temperature and shall be maintained during the test within 0,5 C. The distance between each of the calorimeters shall be approximately 1

44、20 mm. The velocity of the ventilation air around the calorimeters shall be less than 0,5 ms1. When several tests are being carried out simultaneously, at least one reference calorimeter shall be provided for every six test calorimeters; where several test calorimeters are used with one reference ca

45、lorimeter, a hexagonal arrangement shall be used with the reference calorimeter in the centre. ISO 29582-2:2009(E) ISO 2009 All rights reserved 55.2 Procedure 5.2.1 Mortar composition The composition of the mortar shall be in accordance with ISO 679 and the test sample shall have a total mass of (1

46、575 1) g. Each batch of mortar being mixed shall consist of (360,0 0,5) g of cement; (1 080 1) g of sand from a sample of standard sand in accordance with the requirements of ISO 679; and (180,0 0,5) g of distilled or deionized water. Since it is not possible to recover all the material added to the

47、 mixer bowl, the mortar batch being mixed should be slightly more than 1 575 g, the proportions by mass of the various constituents being maintained. 5.2.2 Mixing The cement, the water, the sand, the mortar box, the mixer bowl and the other instruments coming into contact with the mortar shall be st

48、ored in the test room. With the mixer in the operating position, pour the sand and then the cement into the mixer bowl; homogenize the mixture of sand and cement for 30 s at low speed; pour in the water, record the time, and mix immediately at low speed for 60 s; set the mixer to high speed and mix

49、for a further 60 s. In order to avoid thermal losses, it is recommended to carry out the mixing in a relatively short time. It is for this reason that the mixing time prescribed in ISO 679 has been shortened. 5.2.3 Positioning of the test sample Immediately after mixing, weigh (1 575 1) g of mortar into the box (4.4), which has previously been weighed, with its lid, to an accuracy of 0,5 g. Place the lid in position, making sure that it seals tightly. Fill the thermomete