CN105776979A - Reactive powder concrete straddle track beam and precasting technological process thereof - Google Patents
Reactive powder concrete straddle track beam and precasting technological process thereof Download PDFInfo
- Publication number
- CN105776979A CN105776979A CN201610065231.XA CN201610065231A CN105776979A CN 105776979 A CN105776979 A CN 105776979A CN 201610065231 A CN201610065231 A CN 201610065231A CN 105776979 A CN105776979 A CN 105776979A
- Authority
- CN
- China
- Prior art keywords
- rpc
- track girder
- sit
- precasting
- cement
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
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
- 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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/262—Concrete reinforced with steel fibres
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention discloses a reactive powder concrete straddle track beam and a precasting technological process thereof.The track beam is made of an RPC high-strength material through precasting and comprises a track beam body, a top plate, a web plate and a bottom plate which are formed integrally.The reactive powder concrete straddle track beam has the advantages that high tensile strength and durability of the RPC high-strength material are used fully, the section size of the track beam can be reduced remarkably, then the base material utilization amount of a pier is reduced, and structure strength, durability and stability are greatly improved.The straddle track beam excellent in performance can be obtained through the precasting technological process, has remarkable economical benefits and social benefits and has good popularization prospect.
Description
Technical field
The present invention relates to a kind of RPC sit-astride track girder and precasting process flow process thereof, belong to traffic engineering technical field.
Background technology
Current sit-astride track girder is the Simply supported PC beam (being called for short PC track girder) adopting standard section generally more, owing to this track girder should bear vehicular load, it it is again the operation track of train, being referred to as the life line of track traffic, its design have to ensure that the overall linear of track requires and higher structural strength, rigidity, vertical deflection and horizontal anti-torsion deformation.But, existing PC track girder and regular reinforcement track girder, its sectional dimension is all relatively big, causes that beam body deadweight strengthens, and the frame fortune equipment of its track girder and Serial regulation just may require that higher, and difficulty is bigger.And due to the restriction of intensity, the span of PC track girder is limited, may result in the increasing number of track girder and substructure, increase construction costs, the workload that the components such as increase bearing and later stage set a roof beam in place, in view of the foregoing, it is necessary to how research reduces the sectional dimension of track girder, improves its structural strength, durability and stability simultaneously.
Summary of the invention
For solving the deficiencies in the prior art, it is an object of the invention to provide a kind of RPC sit-astride track girder and precasting process flow process thereof, its physical dimension is less, deadweight is lighter, span ability is higher, improves convenience for construction.
In order to realize above-mentioned target, the present invention adopts the following technical scheme that:
First the present invention discloses a kind of RPC sit-astride track girder, it is characterised in that formed by RPC Materials with High Strength is prefabricated, including integrated track girder main body, top board, web and base plate.
RPC (ReactivePowderConcrete, hereinafter referred to as RPC) be after high-strength, high performance concrete, the superhigh intensity developed in the mid-90, high tenacity, high durable, good volume stability cement-base composite material.According to rational proportioning and maintenance technology, this concrete comprcssive strength can reach 200MPa, tensile strength can reach 20～30Mpa, in addition also to have shrinkage and creep little for RPC material, the feature of good endurance, its impermeability, frost resistance and corrosion resistance index are all far superior to normal concrete and general high performance concrete, thus, this track girder of the present invention can make full use of the higher tensile strength of RPC Materials with High Strength and endurance quality, it is significantly reduced the sectional dimension of track girder, and then reduce pier footing material usage, there is suitable economic benefit, and decrease the lifting weight of track girder, solve transport and the lifting problem of normal concrete track girder, the more important thing is, its structural strength, durability and stability also obtain and are greatly improved.
The more important thing is, the invention discloses the precasting process flow process of foregoing a kind of RPC sit-astride track girder, comprise the steps:
S1, preparation prefab-form, it is ensured that being accurately positioned of component each position shape, size and built-in fitting；
S2, prepare raw material: raw material includes cement, aggregate, additive, mix, reinforcing bar, steel fibre and water, the exfactory inspection certificate of competency that each raw material Ying You supplier provides, and by relevant inspection project, batch regulation, should strictly implement entry test；
The preparation of S3, RPC material and perfusion: aggregate, steel fibre, cement and mix are put into stirring 5min in forced mixer, mixing speed is not less than 45 revs/min, then add water, additive is stirred for 4min, the water-cement ratio of RPC material not should be greater than 0.2, and after preparation, the slump of RPC mixture should be less than 180mm；The RPC material of preparation should irrigate complete in 30min, and continuous pouring wanted by component, and the largest interval time is not to be exceeded 6min；
S4, RPC material members maintenance: shaped component in being not less than the environment of 20 DEG C quiet stop 6h after, adopt steam curing, maintenance processes is divided into intensification, constant temperature, cooling three phases, the steam-cured temperature of component is 80 ± 5 DEG C, programming rate is not more than 12 DEG C/h, and cooling rate is not more than 15 DEG C/h, and curing time is not less than 72 hours, when removing lagging facility, the difference of component surface temperature and ambient temperature is not to be exceeded 20 DEG C；Component steam curing is natural curing again after terminating, and ambient temperature is not lower than 20 DEG C, and component carries out watering maintenance, and the time should less than 7d；Steam curing terminates rear form removal, must not note the outward appearance of damaged member the main body of component must not be caused to damage.
Specifically, the volume parts of each raw material is respectively as follows: cement 1 part, 1.47 parts of aggregate, mix 0.25 part, additive 0.02 part, steel fibre 0.06 part, and water-cement ratio is 0.286.
Preferably, aforementioned cement is that stay in grade, strength grade are not less than 42.5 low alkali portland cements or low alkali Portland cement, and in clinker, C3A content not should be greater than 8%, and performance meets GB175-2007 regulation, and each index is referring to table 1 below.
Table 1 cement index parameter
Note: 1 when aggregate has alkali_silica reaction activity, and the alkali content of cement is not to be exceeded 0.60%；
The alkali content of 2RPC cement is no more than 0.60%.
It is highly preferred that aforementioned aggregate is SiO2The content quartz sand more than 97%, additionally, chloride ion content≤0.02%, sulfur trioxide content≤0.50%, mica content≤0.50%, clay content≤0.50% in this quartz sand.In actual process, the quartz sand of corresponding grade can be selected as required, concrete point coarse grain footpath sand (1.25～0.63mm), middle particle diameter sand (0.63～0.315mm) and fine grain sand (0.315～0.16mm).
More preferably, aforementioned additive meets the regulation of GB8076, and water-reducing rate must not lower than 29%, and sodium sulphate content cannot be greater than 2%, it should be noted that forbid to mix chloride salt additive.
More preferably, aforementioned mix water should meet the requirement of JGJ63-2006.
It is further preferred that aforementioned reinforcement property meets the regulation of GB1499.1-2008 and GB1499.2-2007.
Further preferably, aforementioned steel fibre should meet: diameter 0.18～0.23mm, length 12～14mm, and tensile strength is not less than 2850MPa, and performance should meet the technology requirement of JG3064-1999.
Further, in step S3 prepare RPC material time, cement, mix drying regime consumption all by mass, weighing should be accurate to ± 1%；Aggregate adopts dry aggregate, and by mass, weighing should be accurate to ± 2% to consumption；Water, additive consumption by mass, weighing should be accurate to ± 0.5%.
The invention have benefit that: the sit-astride track girder of the present invention can make full use of the higher tensile strength of RPC Materials with High Strength and endurance quality, it is significantly reduced the sectional dimension of track girder, and then reduce pier footing material usage, and, its structural strength, durability and stability also obtain and are greatly improved；Can being obtained the sit-astride track girder of excellent performance by the precasting process flow process of the present invention, have significant economic benefit and social benefit, promotion prospect is good.
Accompanying drawing explanation
Fig. 1 is the structural representation of a kind of RPC sit-astride track girder of the present invention.
The implication of accompanying drawing labelling in figure: 1, track girder main body, 2, top board, 3, web, 4, base plate.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention done concrete introduction.
As shown in Figure 1, the sit-astride track beam structure of the present invention is similarly to the prior art, including integrated track girder main body 1, top board 2, web 3 and base plate 4, the sit-astride track girder focusing on the present invention is formed by RPC Materials with High Strength is prefabricated, elasticity based on RPC Materials with High Strength, reducing track girder sectional dimension, reducing sending of basic material consumption, also improve structural strength, durability and stability.
In order to implement the present invention better, also disclose the precasting process flow process of this RPC sit-astride track girder, comprise the steps:
S1, preparation prefab-form, it is ensured that being accurately positioned of component each position shape, size and built-in fitting；
S2, prepare raw material: raw material includes cement, aggregate, additive, mix, reinforcing bar, steel fibre and water, the exfactory inspection certificate of competency that each raw material Ying You supplier provides, and by relevant inspection project, batch regulation, should strictly implement entry test；
In the present embodiment, the volume parts of each raw material is respectively as follows: cement 1 part, 1.47 parts of aggregate, mix 0.25 part, additive 0.02 part, steel fibre 0.06 part, and water-cement ratio is 0.286.
Wherein, (1), cement are that stay in grade, strength grade are not less than 42.5 low alkali portland cements or low alkali Portland cement, and in clinker, C3A content not should be greater than 8%, and performance meets GB175-2007 regulation, and each index is referring to table 1 above.
(2), aggregate is SiO2The content quartz sand more than 97%, additionally, chloride ion content≤0.02%, sulfur trioxide content≤0.50%, mica content≤0.50%, clay content≤0.50% in this quartz sand.In actual process, the quartz sand of corresponding grade can be selected as required, concrete point coarse grain footpath sand (1.25～0.63mm), middle particle diameter sand (0.63～0.315mm) and fine grain sand (0.315～0.16mm).
(3), additive meet the regulation of GB8076, water-reducing rate must not lower than 29%, and sodium sulphate content cannot be greater than 2%, it should be noted that forbid to mix chloride salt additive.
(4), mix water should meet the requirement of JGJ63-2006.
(5), reinforcement property meets the regulation of GB1499.1-2008 and GB1499.2-2007.
(6), steel fibre should meet: diameter 0.18～0.23mm, length 12～14mm, tensile strength is not less than 2850MPa, and performance should meet the technology requirement of JG3064-1999.
The preparation of S3, RPC material and perfusion: aggregate, steel fibre, cement and mix are put into stirring 5min in forced mixer, mixing speed is not less than 45 revs/min, then add water, additive is stirred for 4min, the water-cement ratio of RPC material not should be greater than 0.2, and after preparation, the slump of RPC mixture should be less than 180mm；The RPC material of preparation should irrigate complete in 30min, and continuous pouring wanted by component, and the largest interval time is not to be exceeded 6min.In this step, prepare RPC material time, cement, mix drying regime consumption all by mass, weighing should be accurate to ± 1%；Aggregate adopts dry aggregate, and by mass, weighing should be accurate to ± 2% to consumption；Water, additive consumption by mass, weighing should be accurate to ± 0.5%.
S4, RPC material members maintenance: shaped component in being not less than the environment of 20 DEG C quiet stop 6h after, adopt steam curing, maintenance processes is divided into intensification, constant temperature, cooling three phases, the steam-cured temperature of component is 80 ± 5 DEG C, programming rate is not more than 12 DEG C/h, and cooling rate is not more than 15 DEG C/h, and curing time is not less than 72 hours, when removing lagging facility, the difference of component surface temperature and ambient temperature is not to be exceeded 20 DEG C；Component steam curing is natural curing again after terminating, and ambient temperature is not lower than 20 DEG C, and component carries out watering maintenance, and the time should less than 7d；Steam curing terminates rear form removal, must not note the outward appearance of damaged member the main body of component must not be caused to damage.
To sum up, the sit-astride track girder of the present invention can make full use of the higher tensile strength of RPC Materials with High Strength and endurance quality, is significantly reduced the sectional dimension of track girder, and then reduces pier footing material usage, and, its structural strength, durability and stability also obtain and are greatly improved；The sit-astride track girder of excellent performance can be obtained by the precasting process flow process of the present invention, comprcssive strength, tensile strength, elastic modelling quantity, chloride permeability coefficient and freezing and thawing performance are all very excellent, having significant economic benefit and social benefit, promotion prospect is good.
The ultimate principle of the present invention, principal character and advantage have more than been shown and described.Skilled person will appreciate that of the industry, above-described embodiment does not limit the present invention in any form, and all employings are equal to the technical scheme that the mode of replacement or equivalent transformation obtains, and all fall within protection scope of the present invention.
Claims (10)
1. a RPC sit-astride track girder, it is characterised in that formed by RPC Materials with High Strength is prefabricated, including integrated track girder main body, top board, web and base plate.
2. the precasting process flow process of a kind of RPC sit-astride track girder as claimed in claim 1, it is characterised in that comprise the steps:
S1, preparation prefab-form, it is ensured that being accurately positioned of component each position shape, size and built-in fitting；
S2, prepare raw material: raw material includes cement, aggregate, additive, mix, reinforcing bar, steel fibre and water, the exfactory inspection certificate of competency that each raw material Ying You supplier provides, and by relevant inspection project, batch regulation, should strictly implement entry test；
The preparation of S3, RPC material and perfusion: aggregate, steel fibre, cement and mix are put into stirring 5min in forced mixer, mixing speed is not less than 45 revs/min, then add water, additive is stirred for 4min, the water-cement ratio of RPC material not should be greater than 0.2, and after preparation, the slump of RPC mixture should be less than 180mm；The RPC material of preparation should irrigate complete in 30min, and continuous pouring wanted by component, and the largest interval time is not to be exceeded 6min；
S4, RPC material members maintenance: shaped component in being not less than the environment of 20 DEG C quiet stop 6h after, adopt steam curing, maintenance processes is divided into intensification, constant temperature, cooling three phases, the steam-cured temperature of component is 80 ± 5 DEG C, programming rate is not more than 12 DEG C/h, and cooling rate is not more than 15 DEG C/h, and curing time is not less than 72 hours, when removing lagging facility, the difference of component surface temperature and ambient temperature is not to be exceeded 20 DEG C；Component steam curing is natural curing again after terminating, and ambient temperature is not lower than 20 DEG C, and component carries out watering maintenance, and the time should less than 7d；Steam curing terminates rear form removal, must not note the outward appearance of damaged member the main body of component must not be caused to damage.
3. the precasting process flow process of a kind of RPC sit-astride track girder according to claim 2, it is characterized in that, the volume parts of each raw material is respectively as follows: cement 1 part, 1.47 parts of aggregate, mix 0.25 part, additive 0.02 part, steel fibre 0.06 part, and water-cement ratio is 0.286.
4. the precasting process flow process of a kind of RPC sit-astride track girder according to claim 2, it is characterized in that, described cement is that stay in grade, strength grade are not less than 42.5 low alkali portland cements or low alkali Portland cement, in clinker, C3A content not should be greater than 8%, and performance meets GB175-2007 regulation.
5. the precasting process flow process of a kind of RPC sit-astride track girder according to claim 2, it is characterised in that described aggregate is SiO2The content quartz sand more than 97%, additionally, chloride ion content≤0.02%, sulfur trioxide content≤0.50%, mica content≤0.50%, clay content≤0.50%.
6. the precasting process flow process of a kind of RPC sit-astride track girder according to claim 2, it is characterised in that described additive meets the regulation of GB8076, and water-reducing rate must not lower than 29%, and sodium sulphate content cannot be greater than 2%.
7. the precasting process flow process of a kind of RPC sit-astride track girder according to claim 2, it is characterised in that described mix water should meet the requirement of JGJ63-2006.
8. the precasting process flow process of a kind of RPC sit-astride track girder according to claim 2, it is characterised in that described reinforcement property meets the regulation of GB1499.1-2008 and GB1499.2-2007.
9. the precasting process flow process of a kind of RPC sit-astride track girder according to claim 2, it is characterized in that, described steel fibre should meet: diameter 0.18～0.23mm, length 12～14mm, tensile strength is not less than 2850MPa, and performance should meet the technology requirement of JG3064-1999.
10. the precasting process flow process of a kind of RPC sit-astride track girder according to any one of claim 2-9, it is characterized in that, in step S3 prepare RPC material time, cement, mix drying regime consumption all by mass, weighing should be accurate to ± 1%；Aggregate adopts dry aggregate, and by mass, weighing should be accurate to ± 2% to consumption；Water, additive consumption by mass, weighing should be accurate to ± 0.5%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610065231.XA CN105776979A (en) | 2016-01-29 | 2016-01-29 | Reactive powder concrete straddle track beam and precasting technological process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610065231.XA CN105776979A (en) | 2016-01-29 | 2016-01-29 | Reactive powder concrete straddle track beam and precasting technological process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105776979A true CN105776979A (en) | 2016-07-20 |
Family
ID=56402620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610065231.XA Pending CN105776979A (en) | 2016-01-29 | 2016-01-29 | Reactive powder concrete straddle track beam and precasting technological process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105776979A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106758576A (en) * | 2016-12-22 | 2017-05-31 | 中交铁道设计研究总院有限公司 | A kind of straddle type single rail prestressed RPC track girder |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203559331U (en) * | 2013-11-06 | 2014-04-23 | 中铁第一勘察设计院集团有限公司 | Reactive powder concrete deck type arch bridge of railway |
| CN103866704A (en) * | 2014-01-28 | 2014-06-18 | 江苏新光环保工程有限公司 | Integral reactive powder concrete sound barrier for high speed railway |
| CN104047226A (en) * | 2014-07-01 | 2014-09-17 | 中铁第一勘察设计院集团有限公司 | Reactive powder concrete thin-wall box beam of railway |
| CN104988951A (en) * | 2015-07-08 | 2015-10-21 | 中铁工程设计咨询集团有限公司 | Straddle type monorail underground section rail wall structure and construction method thereof |
-
2016
- 2016-01-29 CN CN201610065231.XA patent/CN105776979A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203559331U (en) * | 2013-11-06 | 2014-04-23 | 中铁第一勘察设计院集团有限公司 | Reactive powder concrete deck type arch bridge of railway |
| CN103866704A (en) * | 2014-01-28 | 2014-06-18 | 江苏新光环保工程有限公司 | Integral reactive powder concrete sound barrier for high speed railway |
| CN104047226A (en) * | 2014-07-01 | 2014-09-17 | 中铁第一勘察设计院集团有限公司 | Reactive powder concrete thin-wall box beam of railway |
| CN104988951A (en) * | 2015-07-08 | 2015-10-21 | 中铁工程设计咨询集团有限公司 | Straddle type monorail underground section rail wall structure and construction method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 刘娟红等: "《绿色高性能混凝土技术与工程应用》", 31 January 2011, 北京：中国电力出版社 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106758576A (en) * | 2016-12-22 | 2017-05-31 | 中交铁道设计研究总院有限公司 | A kind of straddle type single rail prestressed RPC track girder |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106380147B (en) | A kind of high ductility fiber reinforced cement-based composite material of high temperature resistant and preparation method thereof | |
| CN106278026B (en) | A kind of cement-base composite material and preparation method thereof | |
| CN112960952B (en) | High-crack-resistance light-weight high-strength self-compacting concrete and preparation method thereof | |
| CN103922662A (en) | Ultra-high performance cement base composite material | |
| CN104294728A (en) | Fabricated type reactive powder concrete prefabricated pavement slab without reinforcing rib and manufacturing method thereof | |
| CN107032695B (en) | Steel fiber self-compacting concrete, preparation method thereof and prefabricated part | |
| CN106495581B (en) | Grouting material reinforced for road and preparation method thereof | |
| Aydin et al. | Effect of low quality aggregates on the mechanical properties of lightweight concrete | |
| CN106810175A (en) | A kind of high belite sulphoaluminate cement base gravity flowing levelling mortar | |
| CN108069665A (en) | A kind of graphene concrete and its preparation process | |
| CN110510974A (en) | A kind of efficient aeroge solid waste concrete and preparation method thereof | |
| CN102887716A (en) | Self-compaction refractory concrete | |
| CN109824330A (en) | A kind of high-performance middle-and-low strength concrete | |
| CN110218055A (en) | A kind of negative temperature type sleeve grouting material of low sulfur content and preparation method thereof | |
| CN107117914A (en) | High-strength freeze proof grouting material and preparation method thereof | |
| CN113292300A (en) | High-fluidity ultrahigh-strength cement-based grouting material and preparation method thereof | |
| JP2012153577A (en) | Self-recovery concrete admixture, method for manufacturing the same and self-recovery concrete material using the admixture | |
| CN109053062A (en) | A kind of coal gangue concrete and the preparation method and application thereof | |
| CN103304190B (en) | A kind of roof waterproof layer cast high impervious cracking resistance protective layer and manufacture craft thereof | |
| CN109133802A (en) | A kind of cement-based material and preparation method thereof of Xi Fu ﹑ curing of chloride ion | |
| CN105218007A (en) | A kind of corrosion-resistant mortar and preparation method thereof | |
| CN107746233A (en) | A kind of mortar for building and its production method | |
| CN105776979A (en) | Reactive powder concrete straddle track beam and precasting technological process thereof | |
| CN108046704A (en) | It is a kind of for grouting material of railway bridge bearing and preparation method thereof | |
| Rajamane et al. | Fly ash as a sand replacement material in concrete-A study |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| CB02 | Change of applicant information |
Address after: 210014 Ziyun Road, Qinhuai District, Jiangsu, No. 9, No. Applicant after: CHINA DESIGN GROUP Co.,Ltd. Address before: 210014 Ziyun Road, Qinhuai District, Jiangsu, No. 9, No. Applicant before: Jiangsu Provincial Communications Planning and Design Institute Co.,Ltd. |
|
| COR | Change of bibliographic data | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20160720 |
|
| RJ01 | Rejection of invention patent application after publication |