CN107473645B - High-damping concrete based on internal structure design and preparation method thereof - Google Patents
High-damping concrete based on internal structure design and preparation method thereof Download PDFInfo
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- CN107473645B CN107473645B CN201710833344.4A CN201710833344A CN107473645B CN 107473645 B CN107473645 B CN 107473645B CN 201710833344 A CN201710833344 A CN 201710833344A CN 107473645 B CN107473645 B CN 107473645B
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/14—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted
- B28B1/16—Producing shaped prefabricated articles from the material by simple casting, the material being neither forcibly fed nor positively compacted for producing layered articles
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
- C04B2111/2046—Shock-absorbing materials
Abstract
The invention discloses high-damping concrete based on internal structure design and a preparation method thereof. Introducing one or two polymer modified layers into a common concrete restraint layer to form a plurality of restraint layer-free layer-restraint layer damping unit combinations; the common concrete restraint layer comprises 15-17 parts of cement, 30-35 parts of natural river sand, 42-47 parts of broken stone, 4-8 parts of water and 1-2 parts of a water reducing agent; the polymer modified layer comprises a polymer emulsion or a polymer modified mortar. The high-damping concrete has better energy absorption and dissipation effects, has more excellent vibration reduction and noise absorption performances, and controls the mechanical properties such as rupture resistance, pressure resistance and the like in a reasonable range.
Description
Technical Field
The invention belongs to the technical field of concrete material research and development, and particularly relates to high-damping concrete based on internal structure design and a preparation method thereof.
Background
The concrete is one of the most used materials in the infrastructure, is used as a main material of a building, bears and transmits load, has low self damping, cannot effectively dissipate external vibration energy, and is difficult to avoid damaging and even destroying the structure when being impacted by external large vibration. Therefore, the improvement of the damping of the concrete material has important significance in the aspects of reducing the vibration energy generated by the high-speed train track, ensuring that a precision instrument works normally under the influence of external vibration, causing damage to the bridge structure by a heavy vehicle and the like. These problems all determine to put high demands on the vibration damping performance of the concrete material, so that the improvement of the damping performance of the concrete material is undoubtedly significant for improving the vibration resistance of the structure.
At present, researches for improving the vibration attenuation performance of concrete materials mainly focus on adding polymer emulsion high-damping materials into concrete to improve the damping performance of the concrete materials, but the problems of high cost, mechanical property reduction in different degrees and the like exist. Therefore, the existing technology for improving the damping of the concrete material is still not ideal. Therefore, in view of the wide application of concrete materials, the complexity of stress and the necessity of vibration reduction of structures, it is necessary to develop a high-damping concrete material based on an internal structure design.
Disclosure of Invention
In order to solve the above-mentioned defects in the prior art, the present invention aims to provide a concrete material preparation method which is based on an internal local structure layer design, gives consideration to mechanical properties and damping properties to a certain extent, and has good economical efficiency.
The invention is realized by the following technical scheme.
A high-damping concrete based on internal structure design comprises a common concrete restraint layer and a polymer modification layer, wherein one or two polymer modification layers are introduced into the common concrete restraint layer to form a plurality of restraint layer-free layer-restraint layer damping unit combinations;
the common concrete restraint layer comprises the following raw materials in parts by weight:
15-17 parts of cement, 30-35 parts of river sand, 45-47 parts of broken stone, 1-2 parts of a water reducing agent and 4-6 parts of water;
the polymer modified layer comprises a polymer emulsion or a polymer modified mortar.
Preferably, the polymer mortar comprises the following raw materials in parts by weight:
3-4 parts of cement, 7-9 parts of river sand, 1 part of water reducing agent, 1-2 parts of water and 1-2 parts of polymer emulsion.
Preferably, the polymer emulsion is styrene-acrylic emulsion or emulsified asphalt.
Preferably, the cement is ordinary portland cement with a strength grade of 42.5; the river sand is natural river sand; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
Correspondingly, the invention further provides a preparation method of the high-damping concrete material based on the internal structure design, which comprises the following steps:
1) accurately weighing 15-17 parts of cement, 30-35 parts of river sand and 45-47 parts of broken stone according to the mass parts, uniformly mixing, adding 4-8 parts of water and 1-2 parts of a water reducing agent, and uniformly mixing by hand to form a common concrete restraint layer;
2) forming the common concrete obtained in the step 1) on a part of a test mould;
3) mixing 3-4 parts of cement, 7-9 parts of river sand, 1 part of water reducing agent, 1-2 parts of water and 1-2 parts of polymer emulsion to form polymer modified mortar serving as a polymer modified layer;
4) manually vibrating and forming in a test mold;
5) after the restraint layer of the common cement concrete is initially set, forming the polymer modified layer mixed in the step 3) on the common cement concrete formed in the step 2);
6) after the polymer modified layer is initially set, forming the common concrete mixed by the method in the step 1) on the polymer modified layer to form a combination of a constrained layer-a free layer-a constrained layer damping unit, and maintaining.
Preferably, in the step 3), the pure polymer emulsion is directly used as a modification layer.
Preferably, in the step 4), the mixing is completed within 5min from adding water, and the mixture is manually vibrated for 3 min.
Preferably, in the step 6), the curing temperature is 20 +/-1 ℃, and the relative humidity is controlled to be more than 90% for curing for 7 d.
Preferably, one or two polymer modified layers are introduced into the cement concrete constrained layer to form a plurality of constrained layer-free layer-constrained layer vibration damping unit combinations, wherein the damping ratio is not less than 5.34, the compressive strength is not less than 33.7Mpa, and the flexural strength is not less than 5.15 Mpa.
Compared with the prior art, the invention has the following advantages:
according to the free layer structure prepared by the polymer modified concrete, when a concrete member vibrates, the polymer material in the free layer generates tension-compression deformation, and according to the energy consumption mechanism of the high damping material, when the structure vibrates, the high damping material absorbs energy through bending and stretching, and alternating stress is generated in the high damping material to convert mechanical energy into heat energy, so that the energy consumption effect is achieved. Common concrete is arranged on both sides of the free damping layer to form an upper and lower clamping type structure as a constrained layer structure, so that the constrained layer structure further limits the tensile deformation of the free layer and further increases the shear deformation of the free layer, vibration energy can be consumed more, the vibration reduction effect is more remarkable, and finally the concrete member shows more excellent vibration reduction performance on the whole structure.
The free layer is prepared from a polymer modified concrete material, and because the polymer material has stronger rheological property, polymer emulsion and free water can permeate into common concrete layers close to the polymer modified concrete on the upper and lower surfaces by virtue of the communicating pores of the concrete, so that the cement in the common concrete layers is promoted to be fully hydrated, the polymer emulsion is diffused into the upper and lower layers, the vibration resistance of the concrete member is improved, and in the process, the joint of the original interlayer structure plays a role of cementation because the cement is fully hydrated, so that the adhesion of the interlayer structure is improved.
The high-damping concrete material prepared by the invention has the advantages that the free damping layer is arranged in the middle, the upper layer and the lower layer are both the constraint layers, the function of buffering stress is realized on the load action, the free damping layer has better functions of absorbing and dissipating energy, and finally, vibration and noise generated during the load action are absorbed.
The concrete material prepared by the invention is a local high-damping concrete material, and the polymer is only added into the interlayer structure design of the concrete member as a free layer, so that the cost is reduced to a great extent.
Detailed Description
The present invention is further illustrated by the following examples, which are not to be construed as limiting the invention in any way.
The invention relates to a preparation method of a high-damping concrete material based on internal structure design, which comprises the following steps:
1) accurately weighing 15-17 parts of cement, 30-35 parts of natural river sand and 42-47 parts of broken stone according to the mass parts, uniformly mixing, adding 4-8 parts of water and 1-2 parts of polycarboxylic acid high-efficiency water reducing agent, and uniformly mixing by hand to form a common concrete restraint layer;
2) forming the common concrete obtained in the step 1) on a part of a test mould;
3) preparing a polymer modified layer: including pure polymer emulsions or polymer modified mortars.
① pure Polymer emulsion
Taking 1-2 parts of a polymer emulsion (styrene-acrylic emulsion or emulsified asphalt) modified layer as a free layer structure;
② Polymer-modified mortar
Mixing 3-4 parts of cement, 7-9 parts of river sand, 1 part of water reducing agent, 1-2 parts of water and 1-2 parts of polymer emulsion (styrene-acrylic emulsion or emulsified asphalt) to form polymer modified mortar serving as a free layer structure;
4) the mixing time is completed within 5min from adding water, and the mixture is manually vibrated for 3 min.
5) After the restraint layer of the common cement concrete is initially set, forming the polymer modified layer mixed in the step 3) on the common cement concrete formed in the step 2);
6) after the polymer modified layer is initially set, forming the common concrete mixed by the method in the step 1) on the free layer to form a restraint layer-free layer-restraint layer damping unit combination, and curing for 7 days at the curing temperature of 20 +/-1 ℃ and the relative humidity controlled to be more than 90%.
In order that the invention may be better understood, the invention is further illustrated by the following examples. However, the present invention is not limited to these examples.
Example 1:
the preparation method of the high-damping concrete material based on the internal structure design comprises the following steps:
15 parts of cement, 30 parts of natural river sand, 45 parts of broken stone, 8 parts of water, 2 parts of a water reducing agent and 1 part of emulsified asphalt.
1) Manufacturing a common concrete restraint layer:
the preparation and design process comprises the following steps: accurately weighing the mass of each component according to the proportion, uniformly stirring the components at normal temperature, finishing the stirring within 5min from adding water, forming in a concrete test mold, and manually vibrating for 3min to form a common concrete layer with the thickness of about 70 mm;
2) preparing a polymer modified layer: after the concrete is initially set, uniformly brushing the weighed emulsified asphalt by using a brush, wherein the using amount of the emulsified asphalt is about 10mm to the surface of the whole test piece;
3) manufacturing a combination of constrained layer-free layer-constrained layer damping unit
After the thin polymer layer is preliminarily solidified, the other half of the common concrete is lightly loaded into a test mould by a scraper knife, and the thickness is about 70 mm. Curing at 20 +/-1 deg.c and relative humidity over 90% for 7 days.
Example 2:
the preparation method of the high-damping concrete material based on the internal structure design comprises the following steps:
15 parts of cement, 30 parts of natural river sand, 45 parts of broken stone, 8 parts of water, 2 parts of a water reducing agent and 1 part of styrene-acrylic emulsion.
1) Manufacturing a common concrete restraint layer:
the preparation and design process comprises the following steps: accurately weighing the mass of each component according to the proportion, uniformly stirring the components at normal temperature, finishing the stirring within 5min from adding water, forming in a concrete test mold, and manually vibrating for 3min to form a common concrete layer with the thickness of about 70 mm;
2) preparing a polymer modified layer: after the concrete is initially set, uniformly brushing the weighed styrene-acrylic emulsion by using a brush, wherein the use amount of the styrene-acrylic emulsion is about 10mm to the surface of the whole test piece;
3) manufacturing a combination of constrained layer-free layer-constrained layer damping unit
After the thin polymer layer is preliminarily solidified, the other half of the common concrete is lightly loaded into a test mould by a scraper knife, and the thickness is about 70 mm. Curing at 20 +/-1 deg.c and relative humidity over 90% for 7 days.
Example 3:
the preparation method of the high-damping concrete material based on the internal structure design comprises the following steps:
1) manufacturing a common concrete restraint layer:
17 parts of cement, 33 parts of natural river sand, 42 parts of broken stone, 7 parts of water and 1 part of water reducing agent.
The preparation and design process comprises the following steps: accurately weighing the mass of each component according to the proportion, uniformly stirring the components at normal temperature, finishing the stirring within 5min from adding water, and forming in a concrete test mold to form common concrete with the thickness of about 50 mm;
2) preparing a polymer modified layer:
mixing 3 parts of cement, 9 parts of river sand, 1 part of water reducing agent, 2 parts of water and 1 part of emulsified asphalt to form emulsified asphalt modified mortar serving as a polymer modified layer; after the common concrete layer is initially set, introducing the prepared polymer modified layer to be spread on the surface of the whole test piece, wherein the thickness is about 50 mm;
3) manufacturing a combination of constrained layer-free layer-constrained layer damping unit
After the emulsified asphalt modified mortar layer is initially set, the common concrete is lightly filled into the test mold by a scraper knife, and the thickness of the test mold is 50 mm. Curing at 20 +/-1 deg.c and relative humidity over 90% for 7 days.
Example 4:
the preparation method of the high-damping concrete material based on the internal structure design comprises the following steps:
1) manufacturing a common concrete restraint layer:
17 parts of cement, 33 parts of natural river sand, 42 parts of broken stone, 7 parts of water and 1 part of water reducing agent.
The preparation and design process comprises the following steps: accurately weighing the mass of each component according to the proportion, uniformly stirring the components at normal temperature, finishing the stirring within 5min from adding water, and forming in a concrete test mold to form common concrete with the thickness of about 50 mm;
2) preparing a polymer modified layer:
mixing 3 parts of cement, 9 parts of river sand, 1 part of water reducing agent, 2 parts of water and 1 part of styrene-acrylic emulsion to form styrene-acrylic emulsion modified mortar serving as a polymer modified layer; after the ordinary concrete is initially set, introducing the prepared polymer modified layer to be spread on the surface of the whole test piece, wherein the thickness is about 50 mm;
3) manufacturing a combination of constrained layer-free layer-constrained layer damping unit
After the styrene-acrylic emulsion modified mortar layer is initially set, filling the test mold with concrete by using a scraper knife, wherein the thickness of the test mold is 50 mm. Curing at 20 +/-1 deg.c and relative humidity over 90% for 7 days.
Example 5:
the preparation method of the high-damping concrete material based on the internal structure design comprises the following steps:
1) manufacturing a common concrete restraint layer:
15 parts of cement, 33 parts of natural river sand, 47 parts of broken stone, 4 parts of water and 1 part of water reducing agent.
The preparation and design process comprises the following steps: accurately weighing the mass of each component according to the proportion, uniformly mixing cement, sand and crushed stone at normal temperature, adding water and a water reducing agent, uniformly stirring, and finishing the mixing within 5min from the addition of water to form common concrete which is molded in a test mold and has the thickness of about 90 mm;
2) preparing a polymer modified layer:
mixing 4 parts of cement, 7 parts of river sand, 1 part of water reducing agent, 1-2 parts of water and 2 parts of styrene-acrylic emulsion to form styrene-acrylic emulsion modified mortar serving as a polymer modified layer;
after the common concrete layer is initially set, taking out the test mold, and introducing the prepared polymer modified layer to be spread on the surface of the whole test piece, wherein the thickness is about 30 mm;
3) manufacturing a combination of constrained layer-free layer-constrained layer damping unit
After the styrene-acrylic emulsion modified mortar is initially set, filling the common concrete into the test mold by using a scraper knife, wherein the thickness of the test mold is about 30 mm. Curing at 20 +/-1 deg.c and relative humidity over 90% for 7 days.
Example 6:
the preparation method of the high-damping concrete material based on the internal structure design comprises the following steps:
1) manufacturing a common concrete restraint layer:
15 parts of cement, 33 parts of natural river sand, 47 parts of broken stone, 4 parts of water and 1 part of water reducing agent.
The preparation and design process comprises the following steps: accurately weighing the mass of each component according to the proportion, uniformly mixing cement, sand and crushed stone at normal temperature, adding water and a water reducing agent, uniformly stirring, and finishing the mixing within 5min from the addition of water to form common concrete with the thickness of about 30mm in a test mold;
2) preparing a polymer modified layer:
mixing 4 parts of cement, 7 parts of river sand, 1 part of water reducing agent, 1-2 parts of water and 2 parts of styrene-acrylic emulsion to form styrene-acrylic emulsion modified mortar serving as a polymer modified layer;
after the ordinary concrete is initially set, taking out the test mold, and introducing the prepared polymer modified layer to be spread on the surface of the whole test piece, wherein the thickness is about 30 mm;
3) manufacturing a combination of constrained layer-free layer-constrained layer damping unit
After the styrene-acrylic emulsion modified mortar is initially set, the common concrete is lightly filled into the test mold by using a scraper knife, and the thickness of the test mold is about 90 mm. Curing at 20 +/-1 deg.c and relative humidity over 90% for 7 days.
For different embodiments of a preparation method of a high-damping concrete material based on an internal structure design, C15, C30, C40 and C50 concrete are respectively prepared, a cube test piece with the thickness of 150mm × 150mm × 150mm and a prism test piece with the thickness of 450mm × 100mm × 150mm are respectively formed, the compression resistance, the breaking strength and the damping performance are detected, the C30 concrete is selected for performance detection, and specific detection results are shown in the following table.
The above table shows that the middle free layer adopts different pure polymer emulsions, the mechanical property and the damping ratio of the concrete are different, and when the free layer is styrene-acrylic emulsion, the damping property is better; when different polymer mortars are adopted for the middle free layer, the damping performance of the concrete free layer which is made of styrene-acrylic emulsion modified mortar is better, and the damping effect of the free layer which is made of the modified mortar is better than that of the pure polymer emulsion; when the middle free layer is a styrene-acrylic emulsion modified layer, the damping effect is best when the position of the free layer is designed to one third of the bottom end. The embodiment shows that the high-damping concrete based on the internal structure design and formed by combining the plurality of constrained layer-free layer-constrained layer damping units prepared by the invention has the damping ratio of not less than 5.34, the compressive strength of not less than 33.7MPa and the flexural strength of not less than 5.15 MPa.
The invention optimizes the variety and proportion of the raw materials based on the advantages of various raw materials, compatibility among materials, maximization of the performance of the advantages of the materials, consideration of factors for eliminating vibration and the like, creatively designs the local high-damping concrete material with the characteristics of an interlayer structure, greatly improves the damping function of the concrete material and greatly reduces the cost; the hydration of cement in the common concrete layer structure needs water, and the excessive water in the polymer mortar layer can be transferred into the common concrete layer through the diffusion effect to fully hydrate the cement particles, and the hydration reaction of the cement promotes the bonding of the interlayer structure and the compact concrete structure. Meanwhile, the polymer emulsion wraps hydration products to gradually gather to form a film, so that a space interpenetrating network structure is formed, and the toughness of the material can be improved.
Based on the preparation method and the design concept of the high-damping concrete material with the internal structure design, the material can effectively improve the damping performance of concrete, simultaneously control the mechanical property within a reasonable range, and effectively solve the problem of vibration response of concrete structures.
The present invention is not limited to the above-mentioned embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some substitutions and modifications to some technical features without creative efforts according to the disclosed technical contents, and these substitutions and modifications are all within the protection scope of the present invention.
Claims (7)
1. A high-damping concrete based on internal structure design is characterized by comprising a common concrete restraint layer and a polymer modification layer, wherein one or two polymer modification layers are introduced into the common concrete restraint layer to form a plurality of restraint layer-free layer-restraint layer damping unit combinations; the damping ratio is not less than 5.34, the compressive strength is not less than 33.7Mpa, and the flexural strength is not less than 5.15 Mpa; the common concrete restraint layer comprises the following raw materials in parts by weight:
15-17 parts of cement, 30-35 parts of river sand, 45-47 parts of broken stone, 1-2 parts of a water reducing agent and 4-8 parts of water;
the polymer modified layer comprises a polymer emulsion or a polymer modified mortar;
the polymer modified mortar comprises the following raw materials in parts by weight:
3-4 parts of cement, 7-9 parts of river sand, 1 part of water reducing agent, 1-2 parts of water and 1-2 parts of polymer emulsion;
the polymer emulsion is styrene-acrylic emulsion or emulsified asphalt.
2. The high-damping concrete based on internal structural design according to claim 1, wherein the cement is ordinary portland cement with a strength grade of 42.5; the river sand is natural river sand; the water reducing agent is a polycarboxylic acid high-efficiency water reducing agent.
3. The method for preparing the high-damping concrete based on the internal structure design according to any one of claims 1-2, which is characterized by comprising the following steps:
1) accurately weighing 15-17 parts of cement, 30-35 parts of river sand and 45-47 parts of broken stone according to the mass parts, uniformly mixing, adding 4-8 parts of water and 1-2 parts of a water reducing agent, and uniformly mixing by hand to form a common concrete restraint layer;
2) forming the common concrete obtained in the step 1) on a part of a test mould;
3) mixing 3-4 parts of cement, 7-9 parts of river sand, 1 part of water reducing agent, 1-2 parts of water and 1-2 parts of polymer emulsion to form polymer modified mortar serving as a polymer modified layer;
4) manually vibrating and forming in a test mold;
5) after the restraint layer of the common cement concrete is initially set, forming the polymer modified layer mixed in the step 3) on the common cement concrete formed in the step 2);
6) after the polymer modified layer is initially set, forming the common concrete mixed in the step 1) on the polymer modified layer to form a combination of the constrained layer, the free layer and the constrained layer damping unit, and maintaining.
4. The method for preparing high damping concrete based on internal structure design according to claim 3, wherein in step 3), the polymer emulsion is directly used as the polymer modified layer.
5. The preparation method of high damping concrete based on internal structure design as claimed in claim 3, wherein in step 4), the mixing time is completed within 5min from water addition, and the manual vibration is performed for 3 min.
6. The preparation method of high damping concrete based on internal structure design according to claim 3, characterized in that after the step 6) is completed, the test piece is maintained at 20 ℃ ± 1 ℃ and the relative humidity is controlled to be above 90% for maintenance for 7 d.
7. The preparation method of high damping concrete based on internal structure design as claimed in claim 3, characterized in that one or two polymer modified layers are introduced into the cement concrete constrained layer to form multiple constrained layer-free layer-constrained layer damping unit combinations.
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| CN1435393A (en) * | 2002-02-01 | 2003-08-13 | 张日红 | Color brick for walk, and method for making same |
| CN1792969A (en) * | 2005-11-17 | 2006-06-28 | 中国建筑材料科学研究院 | Sandwich wall board made by straw cement composite material and mfg. process thereof |
| CN1948622A (en) * | 2006-10-31 | 2007-04-18 | 易志坚 | Polymer modified cement hole concrete road surface structure and construction method |
| CN103553496A (en) * | 2013-10-29 | 2014-02-05 | 中南大学 | High-damping self-compaction concrete |
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| JPH10266394A (en) * | 1997-03-27 | 1998-10-06 | Sumitomo Shoji Kk | Damping sound insulating plate for metallic staircase |
| CN1435393A (en) * | 2002-02-01 | 2003-08-13 | 张日红 | Color brick for walk, and method for making same |
| CN1792969A (en) * | 2005-11-17 | 2006-06-28 | 中国建筑材料科学研究院 | Sandwich wall board made by straw cement composite material and mfg. process thereof |
| CN1948622A (en) * | 2006-10-31 | 2007-04-18 | 易志坚 | Polymer modified cement hole concrete road surface structure and construction method |
| CN103553496A (en) * | 2013-10-29 | 2014-02-05 | 中南大学 | High-damping self-compaction concrete |
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