CN104556910A

CN104556910A - Reinforcement material for grouting sandstone grotto rock fracture

Info

Publication number: CN104556910A
Application number: CN201510042093.9A
Authority: CN
Inventors: ***; 赵林毅; 郭青林; 蒋思维; 严绍军; 李最雄
Original assignee: Technology Service Center Of Protection Of Cultural Relics Dunhuang Academy Ch; DUNHUANG RESEARCH INST
Current assignee: Technology Service Center Of Protection Of Cultural Relics Dunhuang Academy Ch; DUNHUANG RESEARCH INST
Priority date: 2015-01-28
Filing date: 2015-01-28
Publication date: 2015-04-29

Abstract

The invention relates to a formula of a reinforcement material for grouting a sandstone grotto rock fracture and a preparation method of the reinforcement material. The method comprises the following steps: a. mixing frit ginger nut, metakaolin and quartz sand at the mass ratio of 1 to 0.6 to 0.4; b. adding an expanding agent AEA which accounts for 10% of total mass of a mixture to the mixture, and stirring in a stirrer evenly; and c. stirring the mixed powder at the water-ash ratio of 0.50-0.60 for 15 minutes for later use. According to the reinforcement material disclosed by the invention, the porosity is 41.72%; the mean compressive strength is not smaller than 15.00MPa; the reinforcement material is still basically complete after being soaked for 300 days; the compressive strength after being frozen and circulated is 13.00MPa; the problem of water seepage of the sandstone grotto rock fracture is solved; and contribution is made for protection of sandstone grottoes.

Description

A kind of reinforcement material for the slip casting of sandstone rock cave rock cranny

Technical field

The present invention relates to a kind of inorganic reinforcing material, is a kind of reinforcement material for the slip casting of sandstone rock cave rock cranny specifically.

Background technology

The anchoring of rock cave Dangerous Rock Body and crack grouting are two very important engineering measures in rock cave reinforcing engineering.The effect of anchoring is mainly from configurational stabilisation Dangerous Rock Body, and concerning the rock cave being located in arid or semiarid zone, the effect of rock cranny slip casting mainly prevents rain infiltration, in case corrosion of anchor bolt, guarantees the anchoring strength of anchor pole.In addition, the rock cranny slip casting Dangerous Rock Body little to some plays and basement rock adhesion, makes whole rock mass keep complete.For the rock cave being located in moist and rainy region, rock cranny slip casting also has a very important effect, prevents the outside seepage of the water in rock mass exactly, avoids stone cultural artifact weathering.

For the structure formation of the different rock mass of China, from the sixties in last century, the environmental quality of historical relic's protection worker residing for the rock cave of various places of China and the characteristic of Grotto rock, the research work of a large amount of Grotto rock crack grouting and rescue protection reinforcing engineering have been carried out with suiting measures to local conditions, rescue large quantities of Grottoes in imminent danger, as the seventies in last century, at the Longmen Grottoes of Luoyang, henan, epoxy resin is adopted to carry out rock cranny slip casting; The eighties, the aqueous epoxy resins that have employed small-molecular-weight at the Dazu Stone Sculptures of Chongqing Sichuan has carried out rock cranny slip casting; The early 1990s, Dunhuang Research Inst. have employed the gravel rock mass of PS-F to cave, Yulin, Guazhou County, Gansu and has carried out anchoring and rock cranny slip casting, and the engineering measure of these Grotto rock crack groutings all serves rescue provide protection to Grottoes.

Summary of the invention

In view of above-mentioned, the object of the present invention is to provide a kind of reinforcement material for the slip casting of sandstone rock cave rock cranny, concrete formula is as follows:

Filler: imitation frosted glass small stone stone, metakaolin, quartz sand mix with mass ratio 1:0.6:0.4

Swelling agent: AEA, accounts for 10% of filler total mass

Host: pure water

Water cement ratio: 0.50 ~ 0.60

The beneficial effect of advantage of the present invention and generation is:

1, expect that small stone stone is the calcareous calculus deposited in Quaternary Loess, primarily of the CaCO of about 70% ₃and the clay mineral composition of about 30%.When material small stone stone after roasting, can produce air hardening cementitious materials CaO and hydraulic cementing materials β-CaSiO more than 900 DEG C ₃and Ca ₂al ₂si ₂o ₇.The key property of imitation frosted glass small stone stone is that air hardening component CaO wherein first generates Ca (OH) with water effect ₂gel, Ca (OH) ₂again with the CO in air ₂, H ₂o effect, generates the larger CaCO of porosity gradually ₃gel.When ambient relative humidity is higher, hydraulic component β-CaSiO ₃and Ca ₂al ₂si ₂o ₇β-the CSH that fast hydration produces _nand C ₂aSH _nimprove the early strength of Seed harvest.This carbonization gradually generates the larger CaCO of porosity ₃β-the CSH that gel and fast hydration produce _nand C ₂aSH _ngel complementary intensity, not only can meet the requirement that historical relic is repaired completely, meanwhile, makes reparation gel compatible very well with the historical relic body being repaired reinforcing, in conjunction with being firmly peeling, and has strong weathering resistance, the protection consolidation effect reached.

2, in this reinforcement material, compound, except selecting quartz sand, selects metakaolin in addition, and control the size of porosity with the addition content controlling metakaolin, meanwhile, in slurries, admixture metakaolin can significantly improve the early strength of slurries Seed harvest.Metakaolin has very high activity, with the calcium oxide CaO effect in the water lime, can form one of the chemical composition of cement calcium aluminosilicate (Ca ₂al ₂si ₂o ₇), calcium aluminosilicate forms aquation calcium aluminosilicate through aquation again, i.e. Behavior of Hardened Cement Paste, and improves the age strength of slurries Seed harvest significantly, particularly early strength, and this is highly beneficial to the infiltration of stifled sandstone rock cave crack.

3, in this reinforcement material, cement expansive material AEA has been selected.The Main chemical component of AEA is calcium aluminate CaOAl ₂o ₃grog, alum KAl (SO ₄) ₂.12H ₂o and gypsum CaSO ₄mixture.When AEA adds after in the imitation frosted glass small stone stone water lime, the CaOAl in high alumina ₂o ₃(simple CA) first with CaSO ₄and the Ca (OH) in the water lime ₂effect also aquation generates inflatable xln---aquation calcium sulfate (C ₃a.3CaSO ₄.32H ₂o), i.e. ettringite, imitation frosted glass small stone stone water lime slurries Seed harvest is produced, and appropriateness expands, the early strength of slurries Seed harvest significantly improves, and the porosity of slurries Seed harvest can be made obviously to decline simultaneously.

4, the good fluidity of slurries, can reach certain degree of depth and compactness of grouting during slip casting.

5, slurries Seed harvest and sandstone Grotto rock have compatible and adhesive preferably, and slurries Seed harvest possesses suitable tension, ultimate compression strength, low-shrinkage and good ageing resistance etc.

6, material is easy to get, and cost is low, simple for production, economical and practical.

Embodiment

Below by following embodiment, the invention will be further described again:

(1) expect that small stone stone is the calcareous calculus deposited in Quaternary Loess, primarily of the CaCO of about 70% ₃and the clay mineral composition of about 30%.When material small stone stone after roasting, can produce air hardening cementitious materials CaO and hydraulic cementing materials β-CaSiO more than 900 DEG C ₃and Ca ₂al ₂si ₂o ₇, this mixture is imitation frosted glass small stone stone, it can be used as one of filler of sandstone rock cave rock cranny slip casting strengthening material.

(2) for a reinforcement material for sandstone rock cave rock cranny slip casting, be made up of following raw material and proportioning:

1) filler: imitation frosted glass small stone stone, metakaolin, quartz sand mix with mass ratio 1:0.6:0.4

2) swelling agent: AEA, accounts for 10% of filler total mass

3) host: pure water

4) water cement ratio: 0.50 ~ 0.60

(3) preparation process of above-mentioned reinforcement material is:

1) imitation frosted glass small stone stone, metakaolin, quartz sand mix with mass ratio 1:0.6:0.4;

2) in said mixture, add AEA uniform mixing in agitator of total mass 10%, pure water is added again in this meal mixed, with 0.50 ~ 0.60 water cement ratio, be in every 1000 grams of meals and add 500 grams of water ~ 600 gram water, stir for subsequent use after 15 minutes;

3) gelling material prepared is inserted in three gang mould tools (4cm × 4cm × 16cm and 7cm × 7cm × 7cm) shaping, after the 28 day length of time, test its physical and mechanical property (see table 1 ~ table 8).

Table 1 degree of mobilization

Table 2 setting time

The water ratio of table 3 after 28 days, dry density and porosity

The shrinking percentage of table 4 after 28 days

The anti-folding of table 5, ultimate compression strength

Table 6 water tolerance test

The humid test of table 7 heatproof

Table 8 freeze-thaw-is tested

As can be seen from table 1 ~ table 5: through this gelling material of test, its porosity reaches 41.72%, and the mean compressive strength of 28 days is not less than 15.00 MPa, and soak after 300 days still substantially intact, after freeze-thaw cycle, its ultimate compression strength is 13.00MPa.And permeable, gas is good, freeze-thaw resistance is strong, and temperature changes repeatedly, humidity changes the impact of its intensity very little repeatedly, has good weathering resistance.Outward appearance, color and luster and structure and sandstone rock cave are coordinated.

Claims

1., for a reinforcement material for sandstone rock cave rock cranny slip casting, be made up of following raw material and proportioning:

1) filler: imitation frosted glass small stone stone, metakaolin, quartz sand mix with mass ratio 1:0.6:0.4;

2) swelling agent: AEA, accounts for 10% of filler total mass;

3) host: pure water;

4) water cement ratio: 0.50 ~ 0.60.

2. the method preparing a kind of reinforcement material for the slip casting of sandstone rock cave rock cranny described in claim 1 is: imitation frosted glass small stone stone, metakaolin, quartz sand are mixed with mass ratio 1:0.6:0.4 during use, then the swelling agent AEA accounting for total mass 10% is added, after more this meal mixed being stirred 15 minutes with 0.50 ~ 0.60 water cement ratio, for subsequent use.