CN117843260A - High-performance mineral-based cementing material and application thereof in preparation of retarding and curing dado mud - Google Patents
High-performance mineral-based cementing material and application thereof in preparation of retarding and curing dado mud Download PDFInfo
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- 229910052500 inorganic mineral Inorganic materials 0.000 title claims abstract description 100
- 239000011707 mineral Substances 0.000 title claims abstract description 100
- 239000000463 material Substances 0.000 title claims abstract description 90
- 230000000979 retarding effect Effects 0.000 title claims abstract description 20
- 238000002360 preparation method Methods 0.000 title description 9
- 239000002002 slurry Substances 0.000 claims abstract description 131
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 29
- 239000000440 bentonite Substances 0.000 claims abstract description 27
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 27
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000004568 cement Substances 0.000 claims abstract description 25
- 238000007711 solidification Methods 0.000 claims abstract description 20
- 230000008023 solidification Effects 0.000 claims abstract description 20
- 239000011575 calcium Substances 0.000 claims abstract description 15
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 9
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 9
- 239000000843 powder Substances 0.000 claims abstract description 9
- 230000005484 gravity Effects 0.000 claims description 46
- 239000002699 waste material Substances 0.000 claims description 37
- 238000012360 testing method Methods 0.000 claims description 29
- 238000002156 mixing Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical group [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims description 8
- 238000005345 coagulation Methods 0.000 claims description 8
- 230000015271 coagulation Effects 0.000 claims description 8
- 230000003111 delayed effect Effects 0.000 claims description 8
- 238000010348 incorporation Methods 0.000 claims description 5
- 239000012190 activator Substances 0.000 claims description 4
- 239000003513 alkali Substances 0.000 claims description 4
- 229910000019 calcium carbonate Inorganic materials 0.000 claims description 4
- 239000002893 slag Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000002689 soil Substances 0.000 abstract description 44
- 230000008901 benefit Effects 0.000 abstract description 7
- 239000013049 sediment Substances 0.000 abstract description 7
- 239000003673 groundwater Substances 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 239000010410 layer Substances 0.000 description 14
- 238000004364 calculation method Methods 0.000 description 9
- 238000010276 construction Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 230000000694 effects Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 6
- 239000004576 sand Substances 0.000 description 6
- 239000004927 clay Substances 0.000 description 5
- 238000006703 hydration reaction Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 150000004677 hydrates Chemical class 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000005553 drilling Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000002688 soil aggregate Substances 0.000 description 3
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 239000012615 aggregate Substances 0.000 description 2
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000010790 dilution Methods 0.000 description 2
- 239000012895 dilution Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 238000005342 ion exchange Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 208000002197 Ehlers-Danlos syndrome Diseases 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- -1 aluminate lime hydrate Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 230000007062 hydrolysis Effects 0.000 description 1
- 238000006460 hydrolysis reaction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/1535—Mixtures thereof with other inorganic cementitious materials or other activators with alkali metal containing activators, e.g. sodium hydroxide or waterglass
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/08—Slag cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/14—Cements containing slag
- C04B7/147—Metallurgical slag
- C04B7/153—Mixtures thereof with other inorganic cementitious materials or other activators
- C04B7/17—Mixtures thereof with other inorganic cementitious materials or other activators with calcium oxide containing activators
- C04B7/19—Portland cements
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Inorganic Chemistry (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paleontology (AREA)
- Mining & Mineral Resources (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention relates to a high-performance mineral-based cementing material and application thereof. The high-performance mineral-based cementing material comprises the following components in parts by weight: 1 part of calcium-based excitant, 1 part of cement and 3 parts of mineral powder. The retarding and curing wall-protecting slurry based on the high-performance mineral-based cementing material comprises the following components: high-performance mineral-based cementing material, bentonite and water; the unconfined compressive strength of the retarded solidified dado mud after 28 days solidification is not lower than 0.2 megapascal. The retarder and curing wall-protecting slurry has the advantage of high water curing due to the addition of the high-performance mineral-based cementing material, and can be gradually cured in a soil environment with abundant groundwater; the sliding surface caused by mud skin wrapped by the cast-in-place pile disappears due to the solidification of the mud, so that the side friction resistance is greatly increased, and the length of the cast-in-place pile can be reduced or the diameter of the cast-in-place pile can be reduced; the invention adopts the bored concrete pile after retarding and solidifying the wall-protecting slurry, and the sediment at the bottom of the bored concrete pile can be solidified after being replaced, thereby increasing the end bearing force of the bored concrete pile and being beneficial to reducing the pile length.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a high-performance mineral-based cementing material and application thereof in preparing retarding solidification dado mud.
Background
Cast-in-place piles were developed in chicago in 1893 in the united states, and mainly solve the problem of excessive foundation settlement in soft soil or medium-strength clay layers with large thickness. With the vigorous development of economic construction in China and the improvement of drilling machinery and technology, the deep foundation type of the cast-in-situ pile has the advantages of wide adaptability, large bearing capacity, stable performance and simple construction, is widely applied and developed in China, is applied to various foundations including soft soil, loess, expansive soil and other special soil, and accumulates rich experience.
Along with the rapid development of high-rise buildings, the bored pile becomes one of main basic forms due to the advantages of high bearing capacity, strong adaptability, low cost and the like. In the process of forming the bored pile, a mud wall protection process is widely adopted in China, and the process aims to prevent soil around the pile from collapsing in the process of boring, form a layer of protective film on the wall of the hole, play a role in preventing water seepage, and simultaneously play a role in lubricating and cooling a drill bit.
The mud wall-protecting bored pile has strong absorption and adhesive force of mud, so that a mud sleeve layer, namely a mud skin, is always remained on the wall of a hole, and the weak interlayer still exists after the pile is formed, the thickness can reach several centimeters to tens of centimeters, and meanwhile, hole bottom sediment with a certain height is inevitably generated.
The bored pile mainly relies on stake side friction resistance and pile tip resistance to provide the bearing capacity, because the existence of mud skin, the friction between stake, the soil becomes the friction between stake and the mud skin, and interface friction coefficient reduces, and the shear strength of mud skin is lower in addition, leads to stake side friction resistance loss more, and the bearing capacity reduces, subsides and increases, even threatens building safety when serious. The mud skin on the pile side surface can greatly reduce pile side friction resistance, and the end resistance can be obviously reduced due to excessive thick hole bottom sediment.
The characteristics of mud skin soil at the pile side of the bored pile are obviously different from those of soil between piles in a mucky soil layer, a clay soil layer and a sandy silt soil layer, and compared with the original soil between piles, the mud skin soil has the characteristics of high water content, large pore ratio, high compressibility, low shear strength, low friction force and the like. The engineering property of mud skin is obviously worse than that of soil between piles, so that a weak layer between piles and soil is formed, and the exertion of side friction resistance is affected. The mud skin soil formed on the pile side is different from the pile-to-pile soil in composition and structure, so that the stress-strain relation is also different from the pile-to-pile soil, the mud skin soil is lower in strength than the pile-to-pile soil, the mud skin soil is easy to soften, the residual strength after softening is lower than the pile-to-pile soil, a weak layer between the pile-to-pile soil is formed, and the side friction resistance is further reduced.
The existence of mud skin can affect the pile soil displacement field and the stress field when the pile foundation is loaded, so that the vertical and horizontal displacement and stress at the pile end are increased, the pile body slides in advance, and the pile foundation settlement is increased. For the same pile, as the mud skin thickness increases and the mud skin elastic modulus decreases, the side friction resistance and the bearing capacity of the pile also gradually decrease. Pile foundation containing sediment is along with sediment thickness increase its bearing capacity also constantly reduces, and the stake subsides more and more.
For mud skin piles with different thicknesses, the thicker the mud skin is, the weaker the constraint effect of soil around the mud skin on the mud skin is, the easier the slippage between the pile and the mud skin is, and the larger the settlement is. When the thickness of the mud skin exceeds a certain value, the restraint effect of the soil around the mud skin on the contact surface between the piles and the mud skin is not dominant, and the interaction between the piles and the soil mainly depends on the strength of the mud skin.
The research shows that the pile side friction resistance is reduced by 15-35% and the ultimate bearing capacity of a single pile is reduced by about 20% due to the existence of mud skin. If the mud skin is too thick, the pile side friction resistance can be reduced by more than 50%, and in some projects, the cast-in-situ bored pile can cause the failure rate of the project pile to be up to 14% due to the reasons, so that the project failure and a great amount of funds are wasted.
The DBJ 15-31-2016 (Guangdong province building foundation design Specification) requires that the side friction of the slurry dado drill (punching and rotary digging) hole digging filling pile in the granite stratum is valued according to soft plastic clay (IL is more than 0.75 and less than or equal to 1), namely the weakening of mud skin to the pile side friction is fully considered. Therefore, how to design the grouting pile slurry, so that the mud skin of the slurry retaining wall has excellent performances such as larger friction coefficient, thereby reducing pile foundation settlement, and becoming a problem to be solved in the field of grouting piles.
Disclosure of Invention
In order to thoroughly eliminate the weakening of mud skin, namely a soft interlayer, on the side friction resistance of the cast-in-place pile and reduce the influence of soft sediment at the bottom of the pile on the bearing capacity of the pile end, the invention provides a high-performance mineral-based cementing material, a retarding solidification wall-protecting slurry based on the high-performance mineral-based cementing material and a preparation method thereof.
In order to achieve the above object, the present invention provides the following technical solutions:
the high-performance mineral-based cementing material comprises the following components in parts by weight: 1 part of calcium-based excitant, 1 part of cement and 3 parts of mineral powder.
The high-performance mineral-based cementing material is a high-performance mineral-based cementing material.
Preferably, the calcium-based excitant is calcium carbonate alkali excitant, the cement is PO42.5 cement, and the mineral powder is S95 grade slag micropowder.
The preparation method of the high-performance mineral-based cementing material comprises the following steps:
(1) Fully mixing mineral powder and cement for 5-10 minutes at the ambient temperature of 5-22 ℃ to obtain a mixture A;
(2) And mixing the calcium-based excitant with the mixture A again for 5-10 minutes at the ambient temperature of 5-22 ℃ to obtain the high-performance mineral-based cementing material.
The high-performance mineral-based cementing material is stored in a dry environment, and is uniformly mixed with water, proper soil or bentonite when in use.
The retarding and curing wall-protecting slurry based on the high-performance mineral-based cementing material comprises the following components: the high-performance mineral-based cementing material, bentonite and water can also consist of the high-performance mineral-based cementing material and waste slurry; wherein the mass ratio of the high-performance mineral-based cementing material to the retarding and curing dado mud is 1:10-13; the unconfined compressive strength of the retarded solidified dado mud after 28 days solidification is not lower than 0.2 megapascal.
The retarding and curing principle of the retarding and curing dado mud based on the high-performance mineral-based cementing material is as follows:
the high-performance mineral-based cementing material belongs to an inorganic hydraulic cementing material, and is macroscopically shown as an endothermic reaction after being mixed with slurry, namely, after the material is fully mixed with the slurry, heat is absorbed from the outside, the molecular activity is increased, the activity of soil particles in the slurry is excited to participate in the reaction, and as the early reaction needs to absorb the heat first, free water in the slurry is more, and a certain time is needed for curing water molecules, the initial setting time is slower, and the initial setting is not carried out for 48 hours.
The reason why the solidification strength of the slurry is increased in the later stage is that after the material is fully mixed with the slurry, the minerals on the surfaces of the material particles undergo strong hydrolysis and hydration reaction with the moisture in the soil, and calcium hydroxide is decomposed from the solution and other hydrates are formed. After various hydrates of the material are generated, some of the hydrates continue to harden to form a stone framework, and some of the hydrates interact with soil, so that the action forms can be summarized as follows: (1) ion exchange and aggregation: ca (OH) in colloids after mineral hydration 2 And Ca 2+ 、OH - And coexist. The clay is formed from SiO 2 Plate-like or needle-like crystals formed as a skeleton, usually having Na on the surface thereof + And K + Plasma, ca precipitated in hydrate 2+ Will be with Na in the soil + And K + Performing equivalent adsorption exchange, and as a result, forming a large amount of soil particles into larger soil masses; due to the hydration product Ca (OH) 2 The soil aggregate has strong adsorption activity, so that the larger soil aggregates are further combined to form a chain-shaped structure of solidified soil, and the pores among the soil aggregates are closed to form stable connection. (2) With the deep hydration reaction of the material, a large amount of Ca is precipitated in the solution 2+ When Ca is 2+ When the amount exceeds the amount required for ion exchange, siO is partially reacted with the clay mineral in an alkaline environment 2 And Al 2 O 3 Chemical reaction occurs to generate stable crystalline mineral CaO-Al which is insoluble in water 2 O 3 -H 2 O-series aluminate lime hydrate and CaO-SiO 2 -H 2 O-series silicate lime hydrate, and the like. (3) Free Ca (OH) in material hydrate 2 Continuously absorbing CO in water and air 2 Acting to produce CaCO 3 The strength of the solidified soil is improved, and the solidified body is the skeleton function of the material and Ca (OH) 2 As a result of the combined physical and chemical actions of (a) the solidified body clay particles and the micro-aggregates form a stable aggregate structure; meanwhile, the hydration reaction products C-S-H gel and Aft of the material are mostly whisker-shaped and columnar, and continuously extend and fill into gaps of particles to form a structural framework, so that the strength of the solidified soil sample is improved, and the reinforcement effect is achieved. In addition, the crack is prevented from expanding to a certain extent by bridging, pinning or deflection action on the crack, so that the strength of the solidified soil is further increased.
The preparation method of the retarding and curing wall-protecting slurry based on the high-performance mineral-based cementing material adopts bentonite or waste slurry to prepare the wall-protecting slurry:
wherein, adopt bentonite to make dado mud, include the following steps:
(1) Performing an indoor test to obtain a corresponding mud specific gravity rho when the hole wall is stable, wherein the mud specific gravity rho is a proper specific gravity of wall protection mud for site construction; the stable hole wall means that the hole wall does not collapse, shrink or the like when the bored pile is drilled and cast in place; empirically, the specific gravity ρ of the dado slurry is 1.02-1.45;
(2) Empirically, determining the incorporation ratio a of the high-performance mineral-based binder (mass ratio of the high-performance mineral-based binder to bentonite); calculating the proportion relation of water, bentonite and high-performance mineral-based cementing material, wherein the steps are as follows:
defining the mass of water in a wall-protecting slurry as m 1 Mass m of bentonite 2 The mass of the high-performance mineral-based cementing material is m 3 ；
It is known that: the specific gravity ρ of the wall-protecting slurry, the specific gravity ρ of the water 1 True density ρ of bentonite 2 The true density of the high-performance mineral-based cementing material is rho 3 Blending ratio
According to the principle of equal volume, it can be obtained that:
it can be derived that:on the premise of->Therefore, the mass ratio of the three components is as follows:
and obtaining the mass ratio of the three materials, namely preparing the wall protection slurry with the specific gravity rho according to the proportion of the three materials.
(3) According to the calculation result of the step (2), adding the high-performance mineral-based cementing material and bentonite into water according to a proportion, stirring uniformly, preparing the wall protection slurry with the required specific gravity, simulating the actual curing environment, and testing the unconfined compressive strength of the cured wall protection slurry after 28 days;
(4) If the unconfined compressive strength of the cured test wall protection slurry in the step (3) is not lower than 0.2 megapascals, the test wall protection slurry is qualified delayed coagulation curing wall protection slurry; if the wall-protecting slurry cannot be solidified after 28 days, the mixing ratio of the high-performance mineral-based cementing material is adjusted until the unconfined compressive strength of the solidified wall-protecting slurry is not lower than 0.2 megapascal, thereby obtaining the retarded solidification wall-protecting slurry.
Or adopting waste mud to manufacture the wall protection mud, comprising the following steps of:
(1) Firstly, performing an indoor test to test the specific gravity rho of the slurry under the condition of stable hole wall, wherein the specific gravity rho of the slurry is the proper specific gravity of the wall protection slurry for site construction (according to experience, the general wall protection specific gravity rho is 1.02-1.45);
(2) Empirically, the incorporation ratio a of the high performance mineral-based cement is determined 1 (mass of high-performance mineral-based cement to mass of waste mud), the true density of the high-performance mineral-based cement is known to be ρ 3 Redefining the mass of the waste mud as m 4 The specific gravity of the waste mud is ρ 4 Blending ratioAccording to the principle of equal volume, the specific gravity rho of the required waste mud is obtained 4 The calculation steps are as follows:
from the calculation results, the required specific gravity ρ of the waste mud can be directly obtained by knowing the blending ratio of the high-performance mineral-based cementing material and the specific gravity of the retaining wall mud 4 。
(3) According to the calculation result of the step (2), adding the high-performance mineral-based cementing material into the waste slurry according to a proportion, stirring uniformly, preparing the wall protection slurry with the required specific gravity, simulating the actual curing environment, and detecting the unconfined compressive strength of the cured wall protection slurry after 28 days;
(4) If the unconfined compressive strength of the cured test wall protection slurry in the step (3) is not lower than 0.2 megapascals, the test wall protection slurry is qualified delayed coagulation curing wall protection slurry; if the wall-protecting slurry cannot be solidified after 28 days, adjusting the mixing ratio of the high-performance mineral-based cementing material or the specific weight of the waste slurry until the unconfined compressive strength of the wall-protecting slurry after solidification is not lower than 0.2 megapascal, thereby obtaining the retarded solidification wall-protecting slurry.
Compared with the prior art, the invention has the following advantages:
(1) The high-performance mineral-based cementing material is added into the retarding and curing wall-protecting slurry, so that the retarding and curing wall-protecting slurry has the advantage of high water curing, and can be gradually cured in a soil environment with abundant groundwater.
(2) The invention has the advantages that the sliding surface caused by mud skin wrapped by the cast-in-place pile disappears due to the solidification of the mud, the side friction resistance is greatly increased, and the length or the diameter of the cast-in-place pile can be reduced.
(3) The invention adopts the bored concrete pile after retarding and solidifying the wall-protecting slurry, and the sediment at the bottom of the bored concrete pile can be solidified after being replaced, thereby increasing the end bearing force of the bored concrete pile and being beneficial to reducing the pile length.
Drawings
Fig. 1 is a diagram showing an actual stress analysis of a bored pile using a wall-protecting slurry in application example 1 and comparative example of the present invention.
Detailed Description
The invention will be further described with reference to specific embodiments, and advantages and features of the invention will become apparent from the description. The embodiments are merely exemplary and do not limit the scope of the invention in any way. It will be understood by those skilled in the art that various changes and substitutions of details and forms of the technical solution of the present invention may be made without departing from the spirit and scope of the present invention, but these changes and substitutions fall within the scope of the present invention.
Example 1
A method for manufacturing wall protection slurry by adopting bentonite comprises the following steps:
(1) Through experiments, the dado mud with the specific gravity rho=1.2 is suitable for construction site application;
(2)definition of high-performance mineral-based cement incorporation ratio a=0.1, specific gravity ρ of water is known 1 =1, true density ρ of bentonite 2 =2.6, the true density of the high-performance mineral-based cement is ρ 3 =3.2. The formula is introduced:
it can be seen that:
(3) According to the calculation result of the step (2), adding the high-performance mineral-based cementing material and bentonite into water according to a proportion, stirring uniformly, preparing the wall protection slurry with the required specific gravity, simulating the actual curing environment, and testing the unconfined compressive strength of the cured wall protection slurry after 28 days;
(4) If the unconfined compressive strength of the cured test wall protection slurry in the step (3) is not lower than 0.2 megapascals, the test wall protection slurry is qualified delayed coagulation curing wall protection slurry; if the wall-protecting slurry cannot be solidified after 28 days, the mixing ratio of the high-performance mineral-based cementing material is adjusted until the unconfined compressive strength of the solidified wall-protecting slurry is not lower than 0.2 megapascal, thereby obtaining the retarded solidification wall-protecting slurry.
According to the specific gravity ρ of the wall-protecting slurry, the specific gravity ρ of the water 1 True density ρ of bentonite 2 The true density of the high-performance mineral-based cementing material is rho 3 The conventional value of the blending ratio a is calculated according to the formula (i) to obtain a series of mass ratios of different water, bentonite and high-performance mineral-based cementing materials, wherein the mass ratios are shown in a table 1.
TABLE 1 proportioning table of retarding and curing wall protecting mud prepared by bentonite
Example 2
A preparation method for preparing wall protection mud by adopting waste mud comprises the following steps:
(1) Through experiments, the dado mud with the specific gravity ρ=1.2 is suitable for construction site application.
(2) Assuming that the high performance mineral based cement has a blend ratio of a=0.1, the high performance mineral based cement has a true density ρ of 3 =3.2. The formula (ii) is taken as follows:
(3) According to the calculation result of the step (2), adding the high-performance mineral-based cementing material into the waste slurry according to a proportion, stirring uniformly, preparing the wall protection slurry with the required specific gravity, simulating the actual curing environment, and detecting the unconfined compressive strength of the cured wall protection slurry after 28 days;
(4) If the unconfined compressive strength of the cured test wall protection slurry in the step (3) is not lower than 0.2 megapascals, the test wall protection slurry is qualified delayed coagulation curing wall protection slurry; if the wall-protecting slurry cannot be solidified after 28 days, adjusting the mixing ratio of the high-performance mineral-based cementing material or the specific weight of the waste slurry until the unconfined compressive strength of the wall-protecting slurry after solidification is not lower than 0.2 megapascal, thereby obtaining the retarded solidification wall-protecting slurry.
According to the specific gravity rho of the wall protection mud, the specific gravity rho of the waste mud 4 The true density of the high-performance mineral-based cementing material is rho 3 Incorporation ratio a 1 According to the above formula (ii), a series of different mass ratios of water, bentonite, high performance mineral-based binder materials are calculated as shown in table 2.
TABLE 2 proportioning of retarder curing wall-protecting mud from waste mud
Application example 1
A method for preparing a dado slurry from bentonite and a high performance mineral based cementitious material, wherein:
the high-performance mineral-based cementing material comprises the following components in parts by weight: 1 part of calcium carbonate alkali activator, 1 part of PO42.5 cement and 3 parts of S95 grade slag micropowder.
The preparation method of the high-performance mineral-based cementing material comprises the following steps:
(1) Fully mixing mineral powder and cement for 5-10 minutes at the ambient temperature of 5-22 ℃ to obtain a mixture A;
(2) And mixing the calcium-based excitant with the mixture A again for 5-10 minutes at the ambient temperature of 5-22 ℃ to obtain the high-performance mineral-based cementing material.
The retarding and curing wall-protecting slurry is prepared from water, bentonite and the high-performance mineral-based cementing material, and the preparation method comprises the following steps:
(1) Performing an indoor simulation test, and determining that the specific gravity of the wall-protecting slurry is 1.26 according to the stratum;
(2) According to the specific gravity 1.26 of the experimental dado mud in the step (1), setting the doping ratio of the high-performance mineral-based cementing material to be 0.08 according to experience, and calculating according to a formula (i) to obtain the mass ratio of water, bentonite and the high-performance mineral-based cementing material as follows: 2.2:1:0.1.
(3) Preparing materials according to the proportion calculated in the step (2), firstly adding water into a stirring pool, then adding a high-performance mineral-based cementing material, then adding bentonite, and fully stirring by using mechanical equipment for not less than 300 times; simulating an actual maintenance environment, and detecting unconfined compressive strength of the cured test dado slurry after 28 days;
(4) If the test wall-protecting slurry cannot be solidified after 28 days, adjusting the mixing ratio of the high-performance mineral-based cementing material,
until the unconfined compressive strength of the wall-protecting slurry after solidification is not lower than 0.2 megapascal.
Application example 2
A method for preparing wall protection mud from waste mud, wherein:
the high-performance mineral-based cementing material comprises the following components in parts by weight: 1 part of calcium carbonate alkali activator, 1 part of PO42.5 cement and 3 parts of S95 grade slag micropowder.
The preparation method of the high-performance mineral-based cementing material comprises the following steps:
(1) Fully mixing mineral powder and cement for 5-10 minutes at the ambient temperature of 5-22 ℃ to obtain a mixture A;
(2) And mixing the calcium-based excitant with the mixture A again for 5-10 minutes at the ambient temperature of 5-22 ℃ to obtain the high-performance mineral-based cementing material.
The method for preparing the retarding and curing wall-protecting slurry by adopting the waste slurry and the high-performance mineral-based cementing material comprises the following steps of:
(1) Performing an indoor simulation test to obtain a wall protection slurry with a proper specific gravity of 1.4;
(2) According to the specific gravity of the test dado mud in the step (1), the doping ratio of the high-performance mineral-based cementing material is set to be 0.1 according to experience, and the specific gravity of the required waste mud is calculated to be 1.33 according to the formula (ii).
(3) Preparing materials according to the proportion of the waste slurry obtained by the calculation in the step (2), firstly putting the waste slurry into a stirring pool, then putting the high-performance mineral-based cementing material into the stirring pool, and fully stirring the materials by using mechanical equipment for not less than 300 times; simulating an actual maintenance environment, and detecting unconfined compressive strength of the cured test dado slurry after 28 days;
(4) And if the wall protection slurry cannot be solidified after 28 days, adjusting the doping ratio of the high-performance mineral-based cementing material and the specific weight of the waste slurry until the unconfined compressive strength of the wall protection slurry after solidification is not lower than 0.2 megapascal.
Application example 3
The delayed coagulation and solidification wall protection slurry in the Dongguan stone hospital utilizes the waste slurry of a sand washing field as a slurry source, and the implementation steps are as follows:
(1) The investigation report shows that the stratum where the whole pile foundation is located is mainly composed of a silt layer at the upper part and permeable sand soil at the lower part, wherein a permeable sand layer and a pebble layer exist in geology, and the underwater hole collapse prevention can be realized only by the aid of the specific gravity of the wall protection mud of 1.4 through an indoor test;
(2) The specific gravity ρ=1.4 of the dado mud, assuming a high performance mineral based cement blend ratio a=0.1, the true density of the high performance mineral based cement is ρ 3 =3.2. The calculation carried over into equation (ii) yields the desired specific gravity of 1.33 for the waste mud.
(3) Adding a high-performance mineral-based cementing material accounting for 10% of the mass of the waste slurry into the waste slurry with the specific gravity of 1.22, uniformly stirring to prepare wall-protecting slurry with the specific gravity of 1.4, and carrying out underwater maintenance, wherein the strength of the wall-protecting slurry is more than 0.2 megapascal after 28 days, so that the wall-protecting slurry meets the requirements;
(4) Firstly, waste slurry with the specific gravity of 1.22 is manufactured in a sand washing field, then the waste slurry is transported to the field by a transport vehicle, 10% of high-performance mineral-based cementing material is added in the field and mixed as required to form wall-protecting slurry, and the wall is protected in the pile hole drilling process, so that the wall of the pile hole is stable and does not collapse.
The practical result shows that the wall protection slurry achieves the functions of retarding and solidifying, the retarding and solidifying wall protection slurry is more stable in the permeable sand layer, soil particles in the slurry and the high-performance mineral-based cementing material can slowly react with each other along with the time, the consistency can be raised, the dilution of groundwater is counteracted, the slurry dilution is prevented, and the phenomenon that the hole wall in the conventional sand layer force slurry wall protection collapses does not occur. The pile test result after 28 days shows that the bearing capacity of the bored concrete pile adopting the retarded solidification dado mud exceeds the bearing capacity of the bored concrete pile adopting the conventional mud dado by 26.7 percent, the settlement is reduced by 30 percent, the integrity of the pile body is better, and no necking occurs.
Comparative example
Adopting a conventional mud retaining process to carry out mud retaining operation of the bored pile, and specifically comprising the following steps:
(1) Conventional slurry is used for wall protection by using undisturbed soil to make slurry or waste slurry;
(2) Filling conventional wall protection slurry after drilling, and keeping balance without collapsing the hole;
(3) Pouring concrete and displacing slurry.
Results: the mud between the concrete and the original soil layer forms mud skin with high water content, the mud state is kept all the time under the action of groundwater, the friction force calculation result of mud skin lubrication is not considered, and the bearing capacity of the actual test is different by more than 20%, namely, the friction force of the original stratum is greatly weakened, in order to weaken the influence of the mud skin, the friction force of the side wall on the pile body is increased, the mud skin is solidified by injecting cement around the cast-in-place pile conventionally, and the cost performance is not high.
Comparative analysis was performed in combination with the application examples and the comparative examples, showing that:
(1) The mineral-based cementing material is directly mixed with the waste slurry to prepare the delayed coagulation wall-protecting slurry, so that the quality common problem of weak mud skin is overcome under the condition of not changing the construction process;
(2) The strength of the solidified slurry exceeds the original stratum, so that the side friction resistance of the pile foundation is increased, the bearing capacity of the pile foundation is directly improved by more than 20%, and meanwhile, the sedimentation is reduced;
(3) Under the condition of the same bearing capacity, the length or the diameter of the concrete pile foundation can be reduced, and the materials are greatly saved.
Claims (5)
1. The high-performance mineral-based cementing material is characterized by comprising the following components in parts by weight: 1 part of calcium-based excitant, 1 part of cement and 3 parts of mineral powder.
2. The high performance mineral-based cementitious material of claim 1, wherein the calcium-based activator is a calcium carbonate alkali activator, the cement is PO42.5 cement, and the mineral powder is S95 grade slag micropowder.
3. The method for preparing a high-performance mineral-based cement according to claim 1 or 2, comprising the steps of:
(1) Fully mixing mineral powder and cement for 5-10 minutes at the ambient temperature of 5-22 ℃ to obtain a mixture A;
(2) And mixing the calcium-based excitant with the mixture A again for 5-10 minutes at the ambient temperature of 5-22 ℃ to obtain the high-performance mineral-based cementing material.
4. The set-retarding, set-back mud of high performance mineral-based cement according to claim 1 or 2, comprising the following components: high-performance mineral-based cementing material, bentonite and water; wherein the mass ratio of the high-performance mineral-based cementing material to the retarding and curing dado mud is 1:10-13; the unconfined compressive strength of the retarded solidified dado mud after 28 days solidification is not lower than 0.2 megapascal.
5. The method for preparing the retarder curing wall-protecting slurry according to claim 4, which is characterized in that the wall-protecting slurry is prepared by bentonite or waste slurry, and comprises the following steps:
(1) Performing an indoor test to obtain a slurry specific gravity rho corresponding to the hole wall stability;
(2) Determining the doping ratio a of the high-performance mineral-based cementing material, and defining the mass of water in the wall-protecting slurry as m 1 Mass m of bentonite 2 The mass of the high-performance mineral-based cementing material is m 3 The method comprises the steps of carrying out a first treatment on the surface of the The specific gravity ρ of the wall-protecting slurry, the specific gravity ρ of the water 1 True density ρ of bentonite 2 The true density of the high-performance mineral-based cementing material is rho 3 Blending ratio
Obtaining the mass ratio of water, bentonite and high-performance mineral-based cementing material according to a formula (i):
(3) According to the mass ratio of the step (2), adding the high-performance mineral-based cementing material and bentonite into water, uniformly stirring to prepare the wall protection slurry with the required specific gravity, simulating the actual curing environment, and detecting the unconfined compressive strength of the cured wall protection slurry after 28 days;
(4) If the unconfined compressive strength of the cured test wall protection slurry in the step (3) is not lower than 0.2 megapascals, the test wall protection slurry is qualified delayed coagulation curing wall protection slurry; if the wall-protecting slurry cannot be solidified after 28 days, adjusting the mixing ratio of the high-performance mineral-based cementing material until the unconfined compressive strength of the solidified wall-protecting slurry is not lower than 0.2 megapascal, thereby obtaining the retarded solidified wall-protecting slurry;
or adopting waste mud to manufacture the wall protection mud, comprising the following steps of:
(1) Performing an indoor test to obtain the mud specific gravity rho when the hole wall is stable;
(2) Determining the incorporation ratio a of the high-performance mineral-based cementitious material 1 Redefining the mass of the waste mud as m 4 The specific gravity of the waste mud is ρ 4 Blending ratioObtaining the specific gravity rho of the required waste mud according to the formula (ii) 4 ：
(3) According to the specific gravity of the waste slurry in the step (2) and the mixing ratio of the high-performance mineral-based cementing material, adding the high-performance mineral-based cementing material into the waste slurry, uniformly stirring to prepare the wall protection slurry with the required specific gravity, simulating the actual curing environment, and testing the unconfined compressive strength of the cured wall protection slurry after 28 days;
(4) If the unconfined compressive strength of the cured test wall protection slurry in the step (3) is not lower than 0.2 megapascals, the test wall protection slurry is qualified delayed coagulation curing wall protection slurry; if the wall-protecting slurry cannot be solidified after 28 days, adjusting the mixing ratio of the high-performance mineral-based cementing material or the specific weight of the waste slurry until the unconfined compressive strength of the wall-protecting slurry after solidification is not lower than 0.2 megapascal, thereby obtaining the retarded solidification wall-protecting slurry.
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