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Cement-based high-early-strength non-shrinkage grouting material

A cement-based, non-shrinking technology, applied in the field of cement-based materials, can solve the problems of unmentioned strength, limited use range, and decreased construction performance of grouting materials, and achieve excellent long-term strength and strength growth rate, with remarkable super early strength characteristics. , the effect of shortening the setting time

Active Publication Date: 2019-07-09
TIANJIN CEMENT IND DESIGN & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current non-shrinkage grouting materials cannot meet these requirements at the same time, especially the strength in the early age is not enough, resulting in construction quality defects
Chinese Patent Publication No. CN103482928A discloses a high-performance non-shrinkage cement-based grouting material. Portland cement is used as the main cementitious material, and the mechanical strength of the grouting material is greatly enhanced by adding thermosetting resin fibers. The strength in one day is about 40 MPa, 28 The daily strength is about 90MPa, but this method requires a complicated preparation process, and the early age strength of 2-4 hours is not mentioned
Chinese Patent Publication No. CN107176812A discloses a high-strength non-shrinkage grouting material. The composite of Portland cement and sulphoaluminate cement is used as the main cementitious material. In order to improve the strength of the grouting material, Portland cement is superfinely ground. 800-1000 mesh, the strength of the obtained grouting material is about 36-39MPa in 1 day, and 92-97MPa in 28 days. This method requires ultra-fine grinding of Portland cement, which cannot be realized by the current actual production equipment. The patent There is also no mention of the early age strength of the grout for 2-4 hours
Chinese Patent Publication No. CN101921086A discloses a cement ultra-high-strength non-shrinkage grouting material. Ordinary Portland cement is used as the cementitious material. By adding steel fibers, the 1-day strength of the grouting material reaches 70-90 MPa, and the 28-day strength reaches 120 MPa. However, due to the addition of steel fibers, the construction performance of the grouting material is greatly reduced, and it cannot enter narrow gaps for key construction, and the scope of use is greatly limited. Although the patented grouting material has very high strength, the early age is 2-4 hours. The strength of
Although this type of cementitious material can make the grouting material have good fluidity and long-term strength growth rate, due to the influence of its hydration reaction mechanism, the 1-day age strength of the cementitious material itself is very low, and it is often necessary to add a large amount of Accelerators and accelerators can significantly improve the 1-day age strength of grouting materials
And at the early age of 2-4 hours, the cementitious material based on Portland cement will not produce obvious strength at all, which is why the 2-4 hour early age strength is not mentioned in the above-mentioned existing invention patents s reason

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Preparation of high belite sulphoaluminate cement clinker powder:

[0030] According to the raw meal weight ratio and batching rate value shown in Table 1, grinding to obtain 1.0 tons of raw meal with a fineness of 0.08mm and a sieve residue of less than 8%, after calcining at 1320°C in a rotary kiln, 0.72 tons (raw meal burned loss of 28%) high belite sulphoaluminate cement clinker, after grinding to obtain a specific surface area of ​​400 ~ 500m 2 / kg of clinker powder.

[0031] Table 1 Raw meal ratio and ingredient rate value

[0032]

[0033] The mineral composition of the clinker is shown in Table 2.

[0034] Table 2 Mineral Composition of High Belite Sulphoaluminate Cement Clinker

[0035]

[0036] The obtained high-belite sulfoaluminate cement clinker with high early strength performance was prepared according to the standard GB17671-1999 "Cement Mortar Strength Test Method (ISO Method)" and GB / T1346-2011 "Cement Standard Consistency Water Consumption, ...

Embodiment 2

[0043] Preparation of high belite sulfoaluminate special cementitious material:

[0044] According to the weight ratio shown in Table 4, add each component into the dry powder mixer in turn, and mix thoroughly and evenly to obtain the high-belite special sulfoaluminate cementitious material specially used for high-early-strength non-shrinkage grouting materials.

[0045] Table 4 The weight ratio of high belite sulfoaluminate special cementitious material

[0046]

[0047] Use the standard GB17671-1999 "Cement Mortar Strength Test Method (ISO Method)", GB / T1346-2011 "Cement Standard Consistency Water Consumption, Setting Time, Stability Test Method" and TC / T313-2009 "Expansion Cement Expansion Rate Test Method"The physical properties of the above three groups of high belite sulfoaluminate special cementitious materials were measured, and the results are shown in Table 5.

[0048] Table 5 Physical properties of high belite sulfoaluminate special cementitious materials

[00...

Embodiment 3

[0053] Preparation of High Early Strength Non-shrinkage Grouting Material

[0054] In this embodiment, polycarboxylate dry powder is selected as the alkaline water agent, mineral oil dry powder is selected as the defoamer, and low-viscosity cellulose ether is selected as the cellulose ether.

[0055] Group number 1:

[0056] Weigh each raw material component according to the following weight: 1000g of high belite sulfoaluminate special gelling material; 100g of heavy calcium powder; 860g of quartz sand; 10g of latex powder; 14g of water reducer; 10g of defoamer; cellulose ether 2g; citric acid 3g; lithium carbonate 1g, a total of 2000g. Pour the weighed material into a mixer and mix thoroughly until the bulk density of multiple samples taken at random does not change after measurement, and the cement-based high-early-strength non-shrinkage grouting material is obtained by mixing evenly.

[0057] Group number 2:

[0058] Weigh each raw material component according to the fol...

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Abstract

The invention relates to a cement-based high-early-strength non-shrinkage grouting material. The grouting material comprises the following raw materials, in parts by weight: 50-55 parts of a high belite sulphoaluminate special cementing material, 5-10 parts of heavy calcium carbonate powder, 38-43 parts of quartz sand, 0.5-0.7 part of latex powder, 0.5-0.7 part of a water reducing agent, 0.36-0.5part of an antifoaming agent, 0.05-0.1 part of cellulose ether, 0.1-0.15 part of citric acid, and 0.03-0.05 part of lithium carbonate, wherein the high belite sulphoaluminate special cementing material is obtained by performing dry blending on the following raw materials, in parts by weight: 60-70 parts of high belite sulphoaluminate cement clinker powder, 5-10 parts of alpha-type high-strength gypsum powder, 5-10 parts of beta-type gypsum powder, and 15-20 parts of ultra-fine fly ash. The grouting material provided by the invention has ultra-high strength of 2-4 h of early age, excellent fluidity, long-term strength growth rate and long-term strength, and certain plastic expansion and rigid expansion after hardening.

Description

technical field [0001] The invention belongs to the technical field of cement-based materials, in particular to a cement-based grouting material with high early strength and no shrinkage. Background technique [0002] Non-shrinkage grouting material is a cement-based material that can be poured and grouted in narrow gaps and dense reinforcement under the condition of no vibration. It is mainly used for anchor bolt anchorage, emergency repair of airstrip, fixation of nuclear power equipment, reinforcement of road and bridge engineering, secondary grouting of equipment foundation, crack treatment of old concrete structure, installation of electromechanical equipment, installation of track and steel structure, installation of wall structure For projects such as thickening and repair of leakage and seepage, grouting construction is also required for the steel sleeve connection between prefabricated building components. With the rapid development of my country's economy and tech...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B7/32C04B111/70C04B111/72
CPCC04B7/323C04B28/065C04B2111/0075C04B2111/70C04B2111/72C04B2201/05C04B2201/50C04B14/28C04B14/06C04B24/26C04B24/383C04B24/06C04B22/10C04B2103/302C04B2103/50Y02P40/10
Inventor 姚丕强赵艳妍
Owner TIANJIN CEMENT IND DESIGN & RES INST
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