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Binder admixture, kaolin product and their manufacture

a technology of kaolin products and binders, applied in the field of new kaolin products, can solve the problems of not being able to significantly improve the manufacturing process of cast concrete products, not being able to shorten the manufacturing time, not being able to provide concrete with better mechanical and chemical properties, and their relatively low strength constitutes the weakest ling in the concrete matrix. , to achieve the effect of improving the mechanical and chemical properties of mixes and improving the properties of hardened binder masses

Inactive Publication Date: 2009-06-25
NORDKALK AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach improves the mechanical and chemical properties of concrete, reduces autogenous shrinkage, and enhances fire and frost resistance, allowing for quicker stiffening and increased final strength while potentially replacing a portion of conventional hydraulic binding agents.

Problems solved by technology

On the other hand, large light expanded clay aggregates, which have also been used to lighten concrete and to also bring water to the concrete matrix, are so large that their relatively low strength constitutes the weakest ling in the concrete matrix.
Although the number of patents related to the admixtures of concrete and the control of hardening is fairly extensive, as a whole, the solutions mentioned above generally only deal with some single phenomena related to the properties of concrete, and they have neither been capable of considerably improving the manufacturing processes of cast concrete products, nor shortening the manufacturing times, nor providing concrete with better mechanical and chemical properties.

Method used

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  • Binder admixture, kaolin product and their manufacture
  • Binder admixture, kaolin product and their manufacture
  • Binder admixture, kaolin product and their manufacture

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0178]The example examines the effect of MKA on the viscosity of binder paste. First, cement paste with different water-binder ratios without stone aggregate was prepared in the test, using general-purpose cement (Portland cement). The viscosity of the paste was measured by the Brookfield viscosimetre after a fixed time period from the mixing. The results are described in FIG. 1. After this, another mix was prepared, wherein ⅓ weight fraction of the cement was replaced with ⅙ weight fraction of MKA. The smaller weight fraction is a consequence of the lower density of MKA (3.15 kg / dm3 vs. 1.0 kg / dm3).

[0179]As the curve indicates, the viscosities of the cement paste blended with MKA are on a considerably lower level, or the dry content that corresponds to the same viscosity is higher for the paste blended with MKA. Formula (1) can be used to calculate that, at a point corresponding to the dry content of 40%, wherein the viscosity is 1120 mPas and which is still on an area that can be ...

example 2

[0181]The example examines the absorption of water into MKA. In the graph of the formula (9), the portion of the pore volume of the particles is used as the y-axis, the portion having been filled with water as a function of time t. 1.0 kg / dm3 is used as the density of the agglomerate. The estimated pore volume in that case is about 50%.

[0182]The graph shows that the space between MKA particles (63%) is filled after 5 minutes, 50% of the pore volume of the particles was filled in 9 minutes, and 90% in 17 minutes.

example 3

[0183]The example demonstrates an advantage provided by the invention to industrially produced pre-cast floor slabs of buildings, i.e., so-called hollow-core slabs, which are manufactured by extruder machines. Considerable factors in industrial production are the casting rate, the early strength, the measurement accuracy of the slab and the soil creep, i.e., subsequent changes on the compression side.

[0184]In the case of the example, the highest casting rates of the machines, about 4 m / min, are reached when the amount of slurry to be cast is

Mass, kgDensity, kg / dm3Volume, dm3% by volumeCement3303.1510539Water1651.0016561(Water-cement ratio = 0.5)

[0185]The effect of the gel-space ratio on the strength is examined in accordance with the formula (1)

X=2.06vccαvccα+w

wherein

the constant describing the change in the cement volume2.06during hydration =vc = specific volume of cement, dm3 / kg =0.32c = weight of cement, kg =330α = degree of hydration =0.6(The value has been selected in accordanc...

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Abstract

A binder mix containing a hydraulic binding agent and an admixture mixed therewith, a process for preparing a hydraulically hardened binder mass, a calcinated kaolin product and a process for preparing the same. A paste-like composition is formed from the hydraulically hardening binding agent, a pozzolanically reacting admixture and water, which, when so desired, contains stone aggregate or similar filler, the paste-like composition is worked and the worked composition is allowed to harden to form the binder mass. The admixture comprises spherical, porous metakaolin agglomerates, the size of which is 2-200 microns and which have an open pore structure. The invention can be used to improve the manufacturing methods of cast concrete products and shorten the manufacturing times, and to provide concrete with better mechanical and chemical properties, as well as improve the fire and frost resistance of concrete.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a Divisional Application of U.S. Ser. No. 10 / 493,982 entitled “Binder Admixture, Kaolin Product and Their Manufacture” to Pentti Virtanen filed on Sep. 7, 2004 and claims the benefit of the filing date thereof under U.S.C. § 120; the present invention also claims foreign priority benefits under 35 U.S.C. § 119 of PCT Patent Application No. PCT / FI02 / 00853 filed Nov. 1, 2002; Finland Patent Application No. 20012116 filed Nov. 1, 2001; and Finland Patent Application No. 20021445 filed Aug. 5, 2002, the disclosures of which are herein incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Technical Field[0003]The present invention relates to new kaolin products and their preparation and use.[0004]The invention relates to a binder mix in particular, which typically contains a hydraulically hardening binder and a pozzolanically reacting admixture.[0005]The invention further relates to a process for manufacturing calci...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C04B14/10C04B33/04C04B20/00
CPCC04B14/106C04B20/0036C04B2103/601C04B18/02C04B18/027C04B20/04C04B20/1066C04B20/1088C04B20/0032Y02W30/91C04B14/10
Inventor VIRTANEN, PENTTI
Owner NORDKALK AB