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Additives for cement

A cement composition and calcium sulfoaluminate technology are applied in the field of additives for dicalcium silicate-calcium sulfoaluminate-ferrite cement, and can solve the problems of not being able to obtain modern concrete properties, not being able to provide short-term strength, etc.

Inactive Publication Date: 2011-01-19
HOLCIM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, dicalcium silicate-rich Portland cement does not provide sufficient short-term strength to meet standard requirements and does not achieve the properties required for modern concrete applications

Method used

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  • Additives for cement
  • Additives for cement
  • Additives for cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] Standard mortars are produced according to EN 196 using the following components:

[0116] BCSAF cement (batch 1) 450g

[0117] water 225g

[0118] Standard sand 1350 grams

[0119] BCSAF cement was prepared as described in Example 6 for clinker 2 in Table 7 of US-A-20070266903.

[0120] Alkanolamines (triethanolamine (TEA) or triisopropanolamine (TIPA)) and / or calcium nitrite were included in the mortar samples at the levels indicated in Table 1 below to prepare Mortars 1 to 12. The content of calcium salts is expressed in % dry weight / cement. The content of alkanolamine is expressed in % / mass of cement.

[0121] The compressive strength of the resulting mortar was measured on cylindrical test pieces of 4 x 4 x 16 cm3 prepared using metal molds at 20°C. The samples were stored in water at 20°C for 7 or 28 days until the compressive strength was measured.

[0122] The results obtained are shown in Table 1.

[0123] Table 1

[0124]

[0125] TEA or TIPA alone ...

Embodiment 2

[0130] Standard EN 196 mortars are manufactured using the following components:

[0131] BCSAF cement (batch 1): 315 grams

[0132] Limestone filler: 135g

[0133] Water : 225g

[0134] Sand: 1350g

[0135] (Note: For the purposes of EN 196 mortar formulations, the limestone filler is considered to be part of the cement so that the total cement content is still 450 g)

[0136] Alkanolamine, triethanolamine (TEA) or triisopropanolamine (TIPA) and / or calcium nitrite or calcium nitrate were contained in the mortar samples at the contents shown in Table 2 below, thereby preparing mortars 13 to 21. The content of calcium salt is expressed in % dry weight / (cement+filler). The content of alkanolamine is expressed in % / mass of cement+filler.

[0137] The compressive strength of the prepared mortar was measured using the procedure described in Example 1.

[0138] The results obtained are shown in Table 2.

[0139] Table 2

[0140]

[0141] The dosage of calcium nitrate in mo...

Embodiment 3

[0148] Standard mortars are produced according to EN 196 using the following components:

[0149] BCSAF cement (batch 2): 337,5 g

[0150] Limestone filler : 112,5 g

[0151] Water : 225g

[0152] Sand: 1350g

[0153] (Note: For the purposes of EN 196 mortar formulations, the limestone filler is considered to be part of the cement so that the total cement content is still 450 g)

[0154] Alkanolamines, with or without calcium nitrite or calcium nitrate, were included in the mortar samples at levels indicated in Table 3 below to prepare mortars 22 to 30. The content of calcium salt is expressed in % dry weight / (cement+filler). The content of alkanolamine is expressed in % / mass of cement+filler.

[0155] The compressive strength of the prepared mortar was measured using the procedure described in Example 1. The results obtained are shown in Table 3.

[0156] table 3

[0157]

[0158] In the absence of calcium nitrate, MDEA provided a maximum strength increase of 28 da...

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Abstract

The invention provides a belite-calcium sulphoaluminate-ferrite (BCSAF) cement composition comprising: a BCSAF clinker which clinker has the following mineralogical composition, based on the total weight of the clinker: 5 to 25%, preferably 10 to 20%, of a calcium aluminoferrite phase having the general formula C2AxF(1-X), wherein X is from 0.2 to 0.8; 15 to 35% of a calcium sulphoaluminate phase; 40 to 75% of belite (C2S); from 0.01 to 10% in total of one or more minor phases selected from calcium sulphates, alkali metal sulphates, perovskite, calcium aluminates, gehlenite, free lime and periclase and / or a vitreous phase; and an alkanolamine.

Description

technical field [0001] The present invention relates to additives for cement, especially dicalcium silicate-calcium sulfoaluminate-ferrite cement. Background technique [0002] Most modern concrete is made from hydraulic cement, usually using Portland cement. [0003] Portland cement is a hydraulic cement made by pulverizing Portland cement clinker, often with the addition of a small amount of calcium sulfate. The frit is produced by heating a specific mixture (finely divided, intimately mixed and homogeneous) of raw materials, containing CaO, SiO 2 、Al 2 o 3 and other materials. The main source of CaO is usually calcium carbonate in the form of limestone. [0004] The frit produced in the form of hard balls contains at least two-thirds of the mass of calcium silicate (tricalcium silicate, alite, (CaO) 3 -SiO 2 and dicalcium silicate, dicalcium silicate, (CaO) 2 -SiO 2 and in current practice more than 60% of the clinker in most cement plants is tricalcium silicate)...

Claims

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Application Information

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IPC IPC(8): C04B22/08C04B24/12C04B28/06
CPCC04B28/065Y02P40/10C04B22/085C04B24/122C04B22/08C04B28/06
Inventor E·加特内V·莫兰
Owner HOLCIM
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