JC/T 740-2006Portland Phosphorous Slag Cement (English PDF)

6.2.1 in this Version);

---The time requirement for the final condensation of Portland phosphorous slag

cement is shortened, namely, time requirement is modified from "shall not

exceed 12 h" to "shall not exceed 10 h" (5.5 in Version 1988; 6.2.2 in this

Version);

---The limitation of ignition loss of Portland phosphorous slag cement is deleted

(5.2 in Version 1988; Chapter 6 in this Version);

---Cement strength index is consistent with GB 1344-1999 Portland Blast Furnace

- Slag Cement, Portland Pozzolana Cement and Portland Fly-ash Cement (5.7

in Version 1988; 6.3.4 in this Version);

---Cement strength test method adopts GB/T 17671-1999 Method of Testing

Cements - Determination of Strength (6.5 in Version 1988; 7.7 in this Version);

---The requirement of chloride ion content and alkali content in cement is added

(6.7 and 6.8 in this Version);

---The stipulation of granulated electric furnace phosphorous slag in cement is

added (Appendix A in this Version);

---The radioactivity detection of granulated electric furnace phosphorous slag is

added (Appendix A.3.4 in this Version);

Portland Phosphorous Slag Cement

4.2 Materials

4.2.1 Plaster

Natural plaster shall comply with Type-G or Type-A Level-2 (or above) plaster or

anhydrite stipulated in GB/T 5483.

When by-product plaster, whose main ingredient is calcium sulfate in industrial

production, is adopted, the performance of cement shall be proved by tests to be

harmless.

4.2.2 Granulated electric furnace phosphorous slag

Granulated electric furnace phosphorous slag shall comply with relevant stipulations

in Appendix A and Appendix B in this Standard.

4.2.3 Granulated blast-furnace slag

Granulated blast-furnace slag shall comply with relevant stipulations in GB/T 203.

4.2.4 Pozzolanic material

Pozzolanic material shall comply with relevant stipulations in GB/T 2847.

4.2.5 Fly ash

Fly ash shall comply with relevant stipulations in GB/T 1596.

4.2.6 Limestone

In limestone, the content of aluminum oxide shall not exceed 2.5%.

4.2.7 Kiln dust

Kiln dust shall comply with relevant stipulations in JC/T 742.

4.2.8 Grinding aid

Grinding aid may be added in the grinding of phosphorous slag cement; the adding

amount shall not exceed 0.5% of the mass of cement. Grinding aid shall comply with

relevant stipulations in JC/T 667.

52.5 and 52.5R.

6.1 Chemical Composition

6.1.1 Magnesium oxide

In clinker, the content of magnesium oxide shall not exceed 5.0%. If cement is qualified

in soundness test conducted through the autoclave method, the content of magnesium

oxide in clinker is allowed to become 6.0%.

6.1.2 Sulphur trioxide

In cement, the content of sulphur trioxide shall not exceed 4.0%.

6.1.3 Chloride ion content

In cement, the content of chloride ion shall not exceed 0.06%.

6.1.4 Alkali content

Alkali content in cement shall be expressed in the calculated value of Na2O + 0.658

K2O. When the use of active aggregate needs to restrict alkali content in cement, it

shall be negotiated and determined by the supply-side and the demand-side.

6.2 Physical Performance

6.2.1 Fineness

Cement fineness shall be expressed in 0.080 mm square-hole sieve residue; it shall

not exceed 6.0%.

6.2.2 Condensation time

Initial cement condensation shall not be earlier than 45 min; final cement condensation

shall not be later than 10 h.

6.2.3 Soundness

Cement soundness shall be tested through the autoclave method. Cement must be

qualified in soundness.

6.2.4 Strength

In terms of phosphorous slag cement, the strength of various ages of concrete of

different strength grades shall not be lower than the requirements in Table 2.

marking, when cement type, strength grade, manufacturer's name and exit-factory

serial number are incomplete, the product shall also be determined as unqualified.

8.4 Test Report

The content of test report shall include the various technical requirements stipulated in

this Standard, as well as test results, the name and mixing amount of mixed materials,

and the production by rotary kiln or shaft kiln clinker. When users demand exit-factory

test report, cement factory shall send out the various test results, except from the 28-

day strength test, within 7 days since the date of cement shipment. A supplementary

report of the 28-day strength test shall be submitted within 32 days since the date of

cement shipment.

8.5 Delivery, Acceptance-check and Arbitration Test

8.5.1 Delivery

In quality acceptance-check of cement in delivery, physical samples may be extracted,

and the test result of the samples shall be taken as the basis. The test report of the

same serial number of cement from cement factory may also be taken as the basis.

Which method shall be adopted for the acceptance-check shall be negotiated and

determined by the supply-side and the demand-side; this content shall be clearly

indicated in contract or agreement.

8.5.2 Acceptance-check and arbitration test

8.5.2.1 The test result of the extracted physical samples shall be taken as the basis of

the acceptance-check. The buyer and the seller shall jointly take samples, and sign-

seal the samples before the shipment or during the delivery. Sampling method shall

comply with GB 12573; sampling size shall be 20 kg, which is divided into two equal

sizes. One shall be preserved by the seller for 40 days; the other shall be tested by the

buyer in accordance with the test items and methods stipulated in this Standard.

Within 40 days, when the buyer conducts the tests and believes that product quality

does not comply with the requirements in this Standard, and the seller dissents, both

parties shall submit the other sample preserved by the seller to a nationally approved

provincial-level (or above) cement quality supervision and inspection institution for

arbitration test.

8.5.2.2 When the test report of the same serial number of cement from cement factory

is taken as the basis of acceptance-check, before the shipment or during the delivery,

the buyer (or entrusted seller) shall take samples from the same serial number of

cement. After both parties jointly sign and seal the sample, the sample shall be

preserved for 3 months.

Within 3 months, when the buyer have doubts about cement quality, both parties shall

submit the jointly signed and sealed sample to a nationally approved provincial-level

Appendix A

(Normative)

Granulated Electric Furnace Phosphorous Slag for Cement Production

A.1 Scope

This Appendix specifies the definition, technical requirements, test methods and

inspection rules of granulated electric furnace phosphorous slag for cement production.

A.2 Granulated Electric Furnace Phosphorous Slag

When electric furnace method is used to make yellow phosphorous, the obtained

molten material, whose primary ingredient is calcium silicate, goes through quenching

and granulation, and becomes granulated electric furnace phosphorous slag (short for

phosphorous slag).

NOTE: by adding a little amount of calcium materials and silicon-aluminum materials,

which are proved by tests to be harmless to the performance of cement and

concrete, to phosphorous slag, phosphorous slag can be modified.

A.3 Technical Requirements

A.3.1 Mass coefficient K value shall not be less than 1.10.

A.3.2 In phosphorous slag, the content of phosphorous pentoxide, shall not be more

than 3.5%.

A.3.3 The loose bulk density (short for bulk weight) of dry phosphorous slag shall not

be more than 1.30 x 103 kg/m3; the maximum dimension of bulk phosphorous slag shall

not be more than 50 mm; granules which are more than 10 mm shall not exceed 5%,

counted by mass percentage.

A.3.4 Conduct the test in accordance with A.4.6; after adding phosphorous slag to

cement, the radioactivity specific activity degree of natural radionuclide radium-226,

thorium-232 and potassium-40 shall simultaneously satisfy IRa <= 1.0; Ir <= 1.0.

A.4 Test Methods

A.4.1 Calcium oxide, magnesium oxide, silicon dioxide, aluminum oxide and

fluorine content

Conduct the test in accordance with GB/T 176. If the content of phosphorous pentoxide

in phosphorous slag is more than 0.5%, adopt EDTA complexometric titration calcium

salt back titration method for the test.

The calculation result shall retain to integer.

A.4.6 Radioactivity

Firstly, grind phosphorous slag into powder. Then, take Portland cement, which is

produced by an enterprise that plans to use phosphorous slag as a mixed material and

complies with the requirements in GB 175; evenly mix the Portland cement with

phosphorous slag powder by the mass ratio of 1:1. Then, comply with the methods in

GB 6566 to test the radioactivity of the mixed sample.

A.5 Inspection Rules

A.5.1 Sampling method

Phosphorous slag which is discharged everyday shall be considered as a serial

number. Sampling shall be representative. Sampling may be consecutive; or an

equivalent amount of sample may be taken from over 20 different parts. The total

amount of sample shall be around 20 kg. After evenly mixing up the sample, use

quartering to divide the sample into 5 kg for the tests. During the sampling, remove