CN112144532A - Concrete structure construction method for reducing foundation constraint - Google Patents
Concrete structure construction method for reducing foundation constraint Download PDFInfo
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- CN112144532A CN112144532A CN202010971509.6A CN202010971509A CN112144532A CN 112144532 A CN112144532 A CN 112144532A CN 202010971509 A CN202010971509 A CN 202010971509A CN 112144532 A CN112144532 A CN 112144532A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- 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
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- 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
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
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- 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
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
Abstract
The invention provides a concrete structure construction method for reducing foundation constraint, wherein during layered casting construction, a high-performance low-elastic-modulus mortar buffer layer is paved between two adjacent layers of concrete, wherein the high-performance low-elastic-modulus mortar buffer layer is paved between the two adjacent layers of concrete by the following steps: pouring the next layer of concrete, after the next layer of concrete reaches the preset strength, chiseling the layered pouring interface of the next layer of concrete, and wetting the layered pouring interface of the next layer of concrete by water; laying high-performance low-elastic-modulus mortar on a layered pouring interface of the next layer of concrete to form a high-performance low-elastic-modulus mortar buffer layer; and pouring a layer of concrete on the high-performance low-elasticity sand pulp buffer layer. The invention aims to overcome the defects of the existing large-volume concrete structure crack control method.
Description
Technical Field
The invention belongs to the technical field of constructional engineering, and particularly relates to a concrete structure construction method for reducing foundation constraint.
Background
Along with the development of urban construction, land resources are increasingly in short supply, and in order to fully utilize underground space, super high-rise buildings, underground space, subways and other large-volume concrete buildings (structures) more and more, the cracking problem of the large-volume concrete structures is rare.
At present, the principle of 'vertical parting and horizontal demixing' is inherited at home and abroad to control the temperature cracks of the mass concrete, the principle of crack control is vertical parting release restraint, and the horizontal demixing reduces the hydration heat temperature rise of the concrete. By adopting the crack control principle, although the temperature cracks of the concrete are reduced to a certain extent, the in-situ investigation finds that in some large-volume concrete structures poured in layers, the concrete of the previous layer cracks due to the long time interval of the pouring in layers and the strong restraint of the concrete of the next layer. Moreover, the cracks are mostly vertical penetrating cracks, once the width of the cracks exceeds 0.2mm, the water seepage of an underground engineering concrete structure can be caused, the durability of the structure is reduced, and the method has great harmfulness. Therefore, crack control of bulk concrete structures is particularly important.
Crack control of a large-volume concrete structure is a system engineering, and can obtain a good crack control effect only by adopting targeted measures in the aspects of structural design, material selection, construction control, structural maintenance and the like, and by means of multi-party linkage of a construction unit, a supervision unit, a design unit, a construction unit and the like. Among them, the structural design is the most basic and the most important ring. Research has found that about 80% of cracks in mass concrete structures are non-load-bearing cracks, and a considerable part of the non-load-bearing cracks are caused by the restraint of the early deformation of mass concrete. Therefore, how to reduce the degree of restraint on the mass concrete structure, fully release the temperature stress of the mass concrete in the cooling process, and reduce or avoid the cracking of the mass concrete structure is a problem to be solved in the field of crack control of the mass concrete structure.
Disclosure of Invention
The invention aims to provide a concrete structure construction method for reducing foundation constraint, and aims to overcome the defects of the existing large-volume concrete structure crack control method.
The invention is realized by the following technical scheme:
a concrete structure construction method for reducing foundation constraint is characterized in that during layered pouring construction, a high-performance low-elasticity pattern mortar buffer layer is laid between two adjacent layers of concrete, wherein the high-performance low-elasticity pattern mortar buffer layer is laid between the two adjacent layers of concrete in the following steps:
pouring the next layer of concrete, after the next layer of concrete reaches the preset strength, chiseling the layered pouring interface of the next layer of concrete, and wetting the layered pouring interface of the next layer of concrete by water;
laying high-performance low-elastic-modulus mortar on a layered pouring interface of the next layer of concrete to form a high-performance low-elastic-modulus mortar buffer layer;
and pouring a layer of concrete on the high-performance low-elasticity sand pulp buffer layer.
Further, the high-performance low-elastic modulus mortar comprises the components of cement, fly ash, slag powder, silica fume, sand, water, a water reducing agent and emulsified asphalt.
Further, the total mass of the high-performance low-elastic modulus mortar is 100 percent and comprises the following components: 16.43-17.77 wt% of cement, 4.44-5.16 wt% of fly ash, 2.78-5.29 wt% of slag powder, 1.11-1.41 wt% of silica fume, 61.03-61.10 wt% of sand, 11.27-12.22 wt% of water, 0.06-0.09 wt% of water reducing agent and 0.52-1.31 wt% of emulsified asphalt.
Further, the thickness of the high-performance low-elastic-modulus mortar buffer layer is 2-5 mm.
Further, the step of pouring a layer of concrete on the high-performance low-elasticity-modulus mortar buffer layer comprises the following steps:
and after the high-performance low-elasticity sand slurry is paved, pouring a layer of concrete within 6 hours.
Further, the step of roughening the layered pouring interface of the next layer of concrete comprises the following steps:
and chiseling off the laitance layer of the next layer of concrete layered pouring interface until the coarse aggregate is exposed, and polishing the layered pouring interface of the next layer of concrete, so that the height difference of each part of the layered pouring interface of the next layer of concrete is smaller than the preset height.
Furthermore, the pouring time interval between the upper layer of concrete and the lower layer of concrete is 7-28 days.
Compared with the prior art, the invention has the beneficial effects that: the high-performance low-elastic-modulus mortar buffer layer is paved on the layered pouring interface of the next layer of concrete, and then the previous layer of concrete is poured, so that the constraint stress of the next layer of concrete to the previous layer of concrete can be fully released, the constraint degree of the next layer of concrete to the previous layer of concrete can be reduced to the maximum extent, the cracking risk of the previous layer of concrete is reduced, and the crack control of a large-volume concrete structure is realized.
Drawings
FIG. 1 is a flow chart showing the steps of the method for constructing a concrete structure with reduced foundation constraints according to the present invention;
FIG. 2 is a schematic view of a concrete structure in the method for constructing a concrete structure to reduce foundation constraint according to the present invention;
FIG. 3 is a diagram of the shrinkage deformation condition of the upper layer of concrete under the condition that a high-performance low-elastic modulus mortar buffer layer is not paved and the upper layer of concrete and the lower layer of concrete are poured at different intervals;
FIG. 4 is a diagram of the shrinkage deformation of the previous layer of concrete under the condition that a high-performance low-elasticity-modulus mortar buffer layer is laid and the previous layer of concrete and the next layer of concrete are poured at different intervals.
In the figure, 1-next layer of concrete, 2-high-performance low-elasticity-modulus mortar buffer layer and 3-previous layer of concrete.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. Meanwhile, in the description of the present invention, the terms "first", "second", and the like are used only for distinguishing the description, and are not to be construed as indicating or implying relative importance.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships conventionally put in use of products of the present invention, and are only for convenience of description and simplification of description, but do not indicate or imply that the devices or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention.
Referring to fig. 1 and 2, fig. 1 is a flow chart illustrating steps of a method for constructing a concrete structure with reduced foundation constraint according to the present invention, and fig. 2 is a schematic view illustrating a concrete structure in the method for constructing a concrete structure with reduced foundation constraint according to the present invention. A concrete structure construction method for reducing foundation constraint is characterized in that during layered pouring construction, a high-performance low-elasticity pattern mortar buffer layer is laid between two adjacent layers of concrete, wherein the high-performance low-elasticity pattern mortar buffer layer is laid between the two adjacent layers of concrete in the following steps:
s1, pouring the next layer of concrete, after the next layer of concrete reaches the preset strength, performing chiseling treatment on the layered pouring interface of the next layer of concrete, and wetting the layered pouring interface of the next layer of concrete by using water;
s2, paving high-performance low-elastic-modulus mortar on a layered pouring interface of the next layer of concrete to form a high-performance low-elastic-modulus mortar buffer layer;
and S3, pouring a layer of concrete on the high-performance low-elasticity-modulus mortar buffer layer.
In the process of pouring concrete, a formwork area of the concrete to be poured is generally divided into a plurality of blocks in the large-volume concrete structure, the concrete is sequentially poured from a lower layer to an upper layer by adopting a layered pouring method, and a high-performance low-elasticity-modulus mortar buffer layer is paved between the adjacent upper and lower layers of concrete so as to realize crack control of the large-volume concrete structure.
In the step S1, the next layer of concrete is poured into the form, and the concrete pouring process is prior art and will not be described herein again. The preset strength may be determined by the age of the concrete in the next layer when the concrete in the next layer reaches the preset strength, which is the same as the age of the concrete in the next layer when the concrete in the next layer is maintained for the preset period, such as 7 days, 14 days or 28 days. And then performing chiseling treatment on the layered pouring interface of the next layer of concrete, namely performing chiseling treatment on the upper surface of the next layer of concrete. Specifically, a floating slurry layer of a next concrete layered pouring interface is chiseled by using a percussion drill or a pneumatic pick until coarse aggregate is exposed, and the next concrete layered pouring interface is polished, so that the height difference of each part of the next concrete layered pouring interface is smaller than the preset height. Further, the preset height may be set to 5 mm. And watering to wet the layered pouring interface of the next layer of concrete.
In the step S2, a spreader is used to lay the high-performance low-elastic-modulus mortar at the layered pouring interface of the next layer of concrete to a designed elevation, so as to form a high-performance low-elastic-modulus mortar buffer layer. The thickness of the laid high-performance low-elastic-modulus mortar buffer layer is 2-5 mm, preferably 3 mm. The high-performance low-elastic-modulus mortar can realize self-leveling performance, and both the initial fluidity and the fluidity after 20 minutes are greater than 130mm under the conditions that the ambient temperature is (23 +/-2) DEG C and the relative humidity is (50 +/-5)%. Further, the high-performance low-elastic modulus mortar comprises the components of cement, fly ash, slag powder, silica fume, sand, water, a water reducing agent and emulsified asphalt. Compared with common cement mortar, the high-performance low-elastic-modulus mortar has the advantages that emulsified asphalt is mixed into the high-performance low-elastic-modulus mortar to form a net structure inside the high-performance low-elastic-modulus mortar, pores inside the high-performance low-elastic-modulus mortar are blocked, bonding among aggregates is enhanced, flexibility of the high-performance low-elastic-modulus mortar is improved, brittleness of the high-performance low-elastic-modulus mortar is reduced, constraint stress of next-layer concrete on previous-layer concrete can be fully released, and cracking risk of the previous-layer concrete is reduced. Specifically, the total mass of the high-performance low-elastic modulus mortar is 100%, and comprises the following components: 16.43-17.77 wt% of cement, 4.44-5.16 wt% of fly ash, 2.78-5.29 wt% of slag powder, 1.11-1.41 wt% of silica fume, 61.03-61.10 wt% of sand, 11.27-12.22 wt% of water, 0.06-0.09 wt% of water reducing agent and 0.52-1.31 wt% of emulsified asphalt, wherein the wt% is mass percentage.
In step S3, after the high performance low resilience mortar is completely laid, a layer of concrete is poured on the upper surface of the high performance low resilience mortar buffer layer, and the interval between the pouring time of the previous layer of concrete and the laying time of the high performance low resilience mortar is 0 to 6 hours, that is, after the high performance low resilience mortar is completely laid, the layer of concrete is poured within 6 hours, and the interval between the pouring time of the previous layer of concrete and the pouring time of the next layer of concrete is 7 to 28 days. And if the concrete structure needs to be poured with multiple layers of concrete, taking the poured upper layer of concrete as the next layer of concrete, and repeating the steps S1 to S3 until the concrete structure is completely poured.
Further, please refer to fig. 3 and fig. 4 in combination, fig. 3 is a diagram illustrating a situation that a high-performance low-elastic modulus mortar buffer layer is not paved and the previous layer of concrete and the next layer of concrete are shrunk and deformed under the condition of different pouring intervals; fig. 4 is a graph showing the shrinkage deformation of the previous layer of concrete under the condition that the high-performance low-elastic-modulus mortar buffer layer is paved, and the previous layer of concrete and the next layer of concrete are poured at different intervals, wherein the different intervals include 7 days, 14 days and 28 days, and the thickness of the paved high-performance low-elastic-modulus mortar buffer layer is 3 mm. And the data of fig. 3 and 4 were obtained from the following experimental procedure: and after the last layer of concrete reaches the strength capable of being demoulded, dismantling the pouring template, respectively arranging a support frame on each of two sides of the last layer of concrete in the length direction, mounting the dial indicator on the support frames, enabling a measuring head of the dial indicator to be in close contact with the side face of the last layer of concrete, reading data on the two dial indicators every 3 days by taking the demould time as a zero point, and taking the sum of the read data of the two dial indicators as the shrinkage deformation value of the last layer of concrete so as to obtain the shrinkage deformation value of the last layer of concrete. When high-performance low-elasticity-modulus mortar is not laid on a layered pouring interface of the next layer of concrete, the shrinkage deformation value of the previous layer of concrete obtained under the condition of pouring the previous layer of concrete is a first shrinkage deformation value, and in fig. 3, the curve of LQ-7-0 is the first shrinkage deformation value corresponding to the previous layer of concrete when the pouring interval time between the previous layer of concrete and the next layer of concrete is 7 days; the curve of LQ-14-0 is a first shrinkage deformation value corresponding to the upper layer of concrete when the pouring interval time of the upper layer of concrete and the lower layer of concrete is 14 days; LQ-28-0 is a first shrinkage deformation value corresponding to the upper layer of concrete when the pouring interval time of the upper layer of concrete and the lower layer of concrete is 28 days; after high-performance low-elastic-modulus mortar is laid on a layered pouring interface of the next layer of concrete, the shrinkage deformation value of the previous layer of concrete obtained under the condition that the previous layer of concrete is poured is taken as a second shrinkage deformation value, and in the graph shown in FIG. 4, the curve of LQ-7-3 is the second shrinkage deformation value corresponding to the previous layer of concrete when the pouring interval time between the previous layer of concrete and the next layer of concrete is 7 days; the curve of LQ-14-3 is a second shrinkage deformation value corresponding to the upper layer of concrete when the pouring interval time of the upper layer of concrete and the lower layer of concrete is 14 days; and the curve of the LQ-28-3 is a second shrinkage deformation value corresponding to the upper layer of concrete when the pouring interval time between the upper layer of concrete and the lower layer of concrete is 28 days. It can be known from the comparison between fig. 3 and fig. 4 that no matter the pouring interval time between the previous layer of concrete and the next layer of concrete is 7 days, 14 days or 28 days, the second shrinkage deformation value obtained at each time of reading the dial indicator data is greater than the corresponding first shrinkage deformation value, that is, under the condition that the previous layer of concrete is poured after the high-performance low-resilience mold mortar is laid on the layered pouring interface of the next layer of concrete, the shrinkage deformation of the previous layer of concrete is relatively large, that is, the shrinkage deformation of the previous layer of concrete is relatively small under the constraint action of the next layer of concrete, so that the cracking risk of the previous layer of concrete is reduced, the previous layer of concrete is not easy to crack, and the structural crack control of large-volume concrete can be realized.
Compared with the prior art, the invention has the beneficial effects that: the high-performance low-elastic-modulus mortar buffer layer is paved on the layered pouring interface of the next layer of concrete, and then the previous layer of concrete is poured, so that the constraint stress of the next layer of concrete to the previous layer of concrete can be fully released, the constraint degree of the next layer of concrete to the previous layer of concrete can be reduced to the maximum extent, the cracking risk of the previous layer of concrete is reduced, and the crack control of a large-volume concrete structure is realized.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any simple modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention will still fall within the scope of the technical solution of the present invention without departing from the content of the technical solution of the present invention.
Claims (7)
1. A concrete structure construction method for reducing foundation constraint is characterized in that during layered pouring construction, a high-performance low-elastic-modulus mortar buffer layer is paved between two adjacent layers of concrete, wherein the high-performance low-elastic-modulus mortar buffer layer is paved between the two adjacent layers of concrete by the following steps:
pouring the next layer of concrete, after the next layer of concrete reaches the preset strength, performing chiseling treatment on the layered pouring interface of the next layer of concrete, and wetting the layered pouring interface of the next layer of concrete by using water;
laying high-performance low-elastic-modulus mortar on the layered pouring interface of the next layer of concrete to form a high-performance low-elastic-modulus mortar buffer layer;
and pouring a layer of concrete on the high-performance low-elasticity sand pulp buffer layer.
2. The method of constructing a concrete structure with reduced foundation constraints as claimed in claim 1, wherein the high-performance low-elastic modulus mortar comprises cement, fly ash, slag powder, silica fume, sand, water reducing agent and emulsified asphalt.
3. The method for constructing a concrete structure with reduced foundation constraints as claimed in claim 2, wherein the high-performance low-elastic modulus mortar comprises, in 100% by mass: 16.43-17.77 wt% of cement, 4.44-5.16 wt% of fly ash, 2.78-5.29 wt% of slag powder, 1.11-1.41 wt% of silica fume, 61.03-61.10 wt% of sand, 11.27-12.22 wt% of water, 0.06-0.09 wt% of water reducing agent and 0.52-1.31 wt% of emulsified asphalt.
4. The method for constructing a concrete structure with reduced foundation constraints as claimed in claim 1, wherein the high-performance low-elastic modulus mortar buffer layer has a thickness of 2-5 mm.
5. The method of constructing a concrete structure with reduced foundation constraints as claimed in claim 1 wherein the step of placing a layer of concrete on the high performance low modulus mortar buffer layer comprises:
and after the high-performance low-elastic-modulus mortar is laid, pouring the upper layer of concrete within 6 hours.
6. The method of constructing a concrete structure with reduced foundation constraints as recited in claim 1, wherein the step of roughening the layered casting interface of the next layer of concrete comprises:
and chiseling off the laitance layer of the next layer of concrete layered pouring interface until the coarse aggregate is exposed, and polishing the layered pouring interface of the next layer of concrete, so that the height difference of each part of the layered pouring interface of the next layer of concrete is smaller than the preset height.
7. The method for constructing a concrete structure with reduced foundation constraints as claimed in claim 1, wherein the time interval between the pouring of the concrete of the previous layer and the pouring of the concrete of the next layer is 7-28 days.
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