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Shrinkage-reducing compound additive capable of effectively reducing CA (cement and asphalt) mortar bleeding, and CA mortar dry material and CA mortar containing same

A compound additive and mortar technology, applied in the field of building materials, can solve the problems of reducing bleeding, increasing the thixotropy of CA mortar, increasing the risk of bleeding of CA mortar, etc., so as to improve frost resistance, improve bleeding and homogeneity Effect

Active Publication Date: 2013-02-13
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the CA mortar disclosed in this patent does not have the function of reducing bleeding. Its so-called shrinkage reduction function is realized by the expansion of bentonite. From the perspective of its shrinkage reduction mechanism, it only partially compensates for the early (CA mortar plastic state) shrinkage. It has no obvious effect on the shrinkage of hardened CA mortar in the middle and late stages
In addition, bentonite has a strong water absorption capacity, which will increase the thixotropy of CA mortar. In order to meet the construction requirements, it is bound to improve its fluidity by increasing the mixing water or water reducing agent of CA mortar, but this will increase the secretion of CA mortar. water risk

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of CaO clinker: limestone and composite mineralizer are mixed according to the mass ratio of 92:8 and ground into raw material, calcined at 1100 ° C for 70 minutes, then quenched in air, ground, and passed through an 80 μm sieve. The obtained CaO clinker has a specific surface area of ​​350m 2 / kg~380m 2 / kg; the composite mineralizer is composed of 40% mixture of equal mass copper slag and chromium slag and 60% industrial gypsum.

[0022] Preparation of MgO by calcining at low temperature: after calcining magnesite at 800°C for 60 minutes, quenching in air, grinding, and sieving through an 80 μm sieve, the content of MgO is 88%, and the loss on ignition is 3%. The hydration activity value is 60-70s, and the specific surface area is 260m 2 / kg~280m 2 / kg.

[0023] Weigh the CaO clinker and the low-temperature calcined MgO in proportion, and mix them uniformly to obtain the composite additive.

Embodiment 2

[0025] Preparation of CaO clinker: mix limestone and composite mineralizer according to the mass ratio of 90:10, grind it into raw material, calcinate at 1300°C for 45min, then quench in air, grind, pass through 80μm sieve, and make it into raw material. The obtained CaO clinker has a specific surface area of ​​180m 2 / kg~220m 2 / kg; the composite mineralizer is composed of 30% copper slag and 70% industrial gypsum.

[0026] Preparation of MgO by calcining at low temperature: after calcining magnesite at 850°C for 40 minutes, quenching in air, grinding, and sieving through an 80 μm sieve, the content of MgO is 86%, and the loss on ignition is 3.5%. The hydration activity value is 80-90s, and the specific surface area is 350m 2 / kg~370m 2 / kg.

[0027] Weigh the CaO clinker and the low-temperature calcined MgO in proportion, and mix them uniformly to obtain the composite additive.

Embodiment 3

[0029] Preparation of CaO clinker: mix limestone and composite mineralizer according to the mass ratio of 95:5, grind it into raw material, calcinate it at 1200°C for 90 minutes, then quench it in air, grind it, and pass it through an 80μm sieve. The specific surface area of ​​the obtained CaO clinker is 270m 2 / kg~300m 2 / kg; the composite mineralizer is composed of a mixture of 50% chromium slag and 50% industrial gypsum.

[0030] Preparation of MgO by calcining at low temperature: after calcination of magnesite at 720°C for 80 minutes, quenching in air, grinding, and sieving through an 80 μm sieve, the content of MgO is 85%, and the loss on ignition is 5%. The hydration activity value is 45-55s, and the specific surface area is 160m 2 / kg~200m 2 / kg.

[0031] Weigh the CaO clinker and the low-temperature calcined MgO in proportion, and mix them uniformly to obtain the composite additive.

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Abstract

The invention discloses a shrinkage-reducing compound additive capable of effectively reducing CA (cement and asphalt) mortar bleeding, and a CA mortar containing the same. The shrinkage-reducing compound additive capable of effectively reducing CA mortar bleeding comprises the following components in percentage by mass: 45-75% of CaO clinker and 25-55% of low-temperature calcined MgO. The shrinkage-reducing compound additive capable of effectively reducing CA mortar bleeding accounts for 1-4% by mass of the CA mortar dry material. The CA mortar containing the additive has the advantages of low bleeding rate, small degree of separation, and favorable freezing resistance, and has an obvious compensation action on volume shrinkage of the CA mortar in medium and later periods.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a shrinkage-reducing composite additive capable of effectively reducing CA mortar bleeding, and CA mortar dry material and CA mortar containing the same. Background technique [0002] With the rapid development of my country's society and economy, inter-regional passenger and cargo exchanges are becoming more and more frequent, and people's demand for railway transportation is increasing rapidly. China is becoming more and more powerless. High-speed is the goal of railway development. The high-speed railway requires the track structure to have stability, smoothness, suitable track elasticity, reliable track components, and convenient maintenance and repair. The track structures used in high-speed railways are divided into two types: ballasted track and ballastless track. Among them, the ballastless track mainly uses fastener systems or elastic cushions to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/06
CPCC04B2/10C04B28/065
Inventor 缪昌文刘加平朱晓斌洪锦祥万赟徐静黄冲王文峰刘至飞
Owner JIANGSU SOBUTE NEW MATERIALS
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