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Cement composition for self-levelling concrete and self-levelling concrete containing such composition

A technology of self-leveling concrete and cement composition, applied in the field of cement composition, can solve problems such as difficulties

Inactive Publication Date: 2010-08-11
SOC DES CIMENTS FR
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0021] Furthermore, the dosing of adjuvants in self-leveling concrete formulations is often difficult due to their influence on the rheological properties of the concrete

Method used

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  • Cement composition for self-levelling concrete and self-levelling concrete containing such composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1( comparative )- Embodiment 2( comparative )- Embodiment 3

[0086] Embodiment 1 (for comparison)-embodiment 2 (for comparison)-embodiment 3 (refer to ratio)-embodiment 4 (the present invention)

[0087] In the first step, comparative examples were carried out using only one reagent. Comparative Example 1 uses only reagents that increase the shear threshold, and Comparative Example 2 uses only reagents that only increase viscosity.

[0088] Table 1 shows the results of these two comparative examples 1 and 2 and example 4 comprising a combination of the two agents and compared to compositions containing fillers in the presence of cohesive agents. This last composition, "Example 3 (Reference)" in all tables, was formulated according to the prior art.

[0089] It has been noted that in Comparative Example 1, which contained only the shear threshold increasing agent, the time in the chute was less than 1 second, reflecting insufficient viscosity, and the sieve stability was greater than 50%. In addition, surface condensation and kinet...

Embodiment 5、6 and 7

[0095] Table 2 shows various concentrations of shear threshold increasing agents and viscosifying agents. Different concentrations of these two reagents have been tested in Examples 5, 6 and 7.

[0096] Table 2

[0097]

[0098] It is worth noting that the performance levels are comparable regardless of their concentration, wherein these concentrations are preferably lower than 0.05 wt% for the first agent and lower than or equal to 0.5 wt% for the second reagent. Therefore, it is possible to obtain self-leveling concrete without fillers by combining these two agents, which has the same performance level compared to self-leveling concrete with fillers.

Embodiment 11

[0104] Example 11 (reference containing filler) and Example 12

[0105] A Portland cement differing mainly in its strength level, namely CEM II 45.5R cement, was tested. The results are shown in Table 4.

[0106] Table 4

[0107]

[0108] Mixtures of the two agents of the present invention are also effective with this cement. The level of performance obtained is comparable to that of concrete containing fillers (Ref. Example 11).

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Abstract

The invention relates to a cement composition for a self-levelling concrete, that comprises a mixture of rheology-modifying additives, characterised in that it comprises the combination of at least a first agent for substantially increasing the shear threshold of the concrete in the fluid state and at least a second viscosity-increasing agent for substantially increasing the viscosity of said concrete in the fluid state in order to limit or prevent the dynamic segregation of granulates in the concrete during the implementation thereof. The use of such a composition can replace the presence of a filler in the concrete, in particular a self-levelling concrete, without diminishing the performance concerning the spreading thereof, the sieve stability, the bleeding and the dynamic segregation relative to a concrete containing a filler, in particular a concrete having the same water / cement ratio.

Description

technical field [0001] The present invention relates to cement compositions for self-leveling concrete containing admixtures of rheology-modifying auxiliaries, and to self-leveling concrete containing such compositions. Background technique [0002] Self-leveling concrete is a very fluid, uniform and stable concrete that does not require vibration during use and can be compacted only under the action of gravity. Self-leveling concretes constitute a special class of self-leveling concretes corresponding to horizontal applications such as cladding, paving or floors. [0003] These concretes contain particulate matter (which can be up to about 20mm in size) which are encapsulated in a cement composition comprising a hydraulic binder, such as Portland cement, and at least one auxiliary agent, preferably a liquefying agent or superplasticizers, which are capable of imparting increased fluidity to the mixture that approximates that of a liquid. This explains the self-leveling or...

Claims

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Application Information

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IPC IPC(8): C04B24/38C04B24/32C04B28/02C04B103/44C04B111/10
CPCC04B28/02C04B2111/62C04B2111/00103C04B2111/10C04B40/0039C04B2103/0079C04B2103/44C04B24/383C04B24/32C04B24/38C04B2103/32
Inventor 法贝尔·法布里斯
Owner SOC DES CIMENTS FR
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