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Enhance Cement Compressive Strength At All Ages

This example illustrates the enhanced compressive strengths of mortars Produced from Six different Portland cements with the addition of DEIPA when compared with cements prepared With TIPA and TEA. Two inch mortar cubes were produced from six commercially available cements using the procedure specified in ASTM C109. Additives were added to the mixing water before the addition of the cement, at a dosage of 0.0001 g of additive per gram of cement. Compressive strengths of the resulting cubes were measured at ages of 1, 3, 7 and 28 days. Table shows the DEIPA is generally superior to TEA and TIPA in its ability to improve early compressive strength (at 1, and 3 day) and also late compressive strength (at 7 and 28 day) properties.

Better Finish Surface of Cement

This example illustrates the improved porosity and finish surface of mortars made With DEIPA. Two mortars were made in accordance to EN 196 standard—one containing DEIPA and the other containing an equivalent amount of TIPA for comparison. After determination of the air content,the mortars were poured and allowed to cure for 1 day without tamping or vibration. Electronic reproductions (see FIG. 2) of the surface of each sample show that mortar made with cement interground with triisopropanolamine (TIPA) created many large surface holes and large pores in the mortar. These large holes and pores were, however, not seen with cement made with DEIPA (see FIG. 1).

Less Bubbles & Pores in Cement Paste

                                                          Reduction in Air Contents

Plant

Additive

Dosage (%)

BSA(m2/kg)

Air (%)

1

DEIPA

0.006

418

5.1

1

TIPA

0.010

418

7.2

2

DEIPA

0.010

338

5.7

2

TIPA

0.010

340

6.8

Remarks

This example illustrates the reduction in air contents from mortars made with industrial cements interground to equal fineness as determined by Blaine specific area (BSA) measurements with DEIPA and TIPA from 2 plants. Standard mortars were produced using procedure specified in EN 196.

 


Reduction in in air entrainment and bubble formation

Cement

Additive

Air (%)

Amount of Bubbles

workability

A

TIPA

4.1

most

8

A

TEA

2.6

few

7

A

DEIPA

3.2

 some

9

Remarks

This example illustrates the reduction in air entrainment and bubble formation of mortar and concrete made with DEIPA as an additive. In this test, 0.15 g of additive was to 550 g of water in a mixing bowl. One thousand grams of cement was subsequently added into the mixing bowl set to mix at low speed. After 30 seconds of mixing, 2600 g of masonry sand was added into the cement paste mixture. The mixing was allowed to mix for a total of 5 minutes. In the case of the TIPA mix, the air content was more than the DEIPA and the triethanolamined (TEA) mixes. we also observed a decrease in bubble formation and an enhancement in workability of mortar surfaces when DEIPA was used. A rating of 10 is best and 0 is worst for workability.

 

Saving Cement Setting Time

This example illustrates the unexpected early setting from mortars made with industrial cements interground to equal fineness as determined by Blaine specific area (BSA) measurements With DEIPA and TIPA. The Vicat set-time experiment was conducted using the procedure specified in EN 196. The results are shown in Table.

Combinable with TIPA & TEA

This example and Table demonstrate the combinability of DEIPA and TIPA with each other to obtain enhanced strength enhancement. When further used in combination with known additives such as soluble alkali metal salt set accelerators and set retarders enhancement of cement properties are obtained.

(All the above data are cited from below patent document,for your reference only.)

 
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