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Process for producing hardening accelerators for mineral binder compositions

一种固化促进剂、矿物粘结剂的技术，应用在凝结和固化促进剂以及包含这种促进剂的粘结剂组合物,改进矿物粘结剂的早期抗压强度领域，能够解决促进添加剂无法满意地替代热处理或蒸气处理、混凝土扩展度降低、可加工性降低等问题，达到有利于经济性、良好早期抗压强度、简单成本的效果

Active Publication Date: 2014-07-02
SIKA TECH AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] To date, however, accelerator additives have generally not been a satisfactory substitute for heat or steam treatment
Additives based on calcium and silicon compounds, although they promote setting and hardening, generally have the disadvantage that they are too viscous in their consistency, making their preparation and their application (in particular metering) expensive
[0005] Although the viscosity can be reduced by adding plasticizers (Fliessmitteln), additional plasticizers in mortar compositions or concrete compositions cause the degree of expansion to vary w / z, which is generally undesirable
Furthermore, it is known that the use of accelerator additives often leads to a drastic reduction in the workability of mortar compositions or concrete compositions due to a marked reduction in the degree of expansion of the concrete

Method used

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  • Process for producing hardening accelerators for mineral binder compositions
  • Process for producing hardening accelerators for mineral binder compositions
  • Process for producing hardening accelerators for mineral binder compositions

Examples

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Embodiment

[0117] 1. Raw materials used

[0118] The following raw materials were used in the examples (Table 1):

[0119] Table 1: Raw materials and names used

[0120]

[0121] 2. Preparation of coagulation and curing accelerators

[0122] Accelerators according to the invention and comparative compounds were prepared according to Preparation Methods 1 and 2 described below, using the starting materials used according to Section 1.

[0123] 2.1 Preparation method 1

[0124] Preparation method 1 is based on mixing the acidic compound before reacting the calcium compound CV with the silicon compound SV.

[0125] In a first step, a silicon solution SVL.1 was prepared in which 20% by weight of the silicon compound SV from Table 1 was dissolved in pure water. The resulting solution was stirred for 1 min. SiO 2 :Na 2 The molar ratio of O is 1.2 here.

[0126] In parallel to this, different calcium solutions CVL.1-CVL.12 and CVL.R1-CVL.R5 (for comparison purposes) were prepare...

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Abstract

A process for preparing a setting and hardening accelerator for mineral binders includes the following steps: a) reacting a calcium compound CV with a silicon compound SV, and b) adding an acidic compound having a molecular weight of not more than 200 g / mol, more particularly 40-100 g / mol.

Description

technical field [0001] The present invention relates to a process for the preparation of a setting and curing accelerator for mineral binders, said process comprising the step of reacting a calcium compound CV with a silicon compound SV. The invention also relates to setting and curing accelerators and adhesive compositions comprising such accelerators. Furthermore, the invention relates to the use of said setting and curing accelerators for improving the early compressive strength of mineral binders. Background technique [0002] High early strength is increasingly required in precast concrete or reinforced concrete precast or road renovation or runway renovation, so that concrete elements can be demoulded, transported, stacked or prestressed after a few hours, or roads or runways You can drive in hours. To achieve this in practice, in addition to high-performance concrete formulations (for example low w / z-values ​​or high cement contents), heat or steam treatments are of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02C04B40/00
CPCC04B28/04C04B28/02C04B2103/12C04B40/0042C04B2103/14C04B22/085C04B40/0039C04B12/04C04B24/04C04B2103/20C04B22/00863C04B22/082C04B14/062C04B22/126C04B22/128
Inventor F·沃姆巴彻尔B·马拉扎尼C·布尔格C·库尔兹G·梅德尔
Owner SIKA TECH AG
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