CN105254207A - Concrete anti-cracking expanding agent - Google Patents
Concrete anti-cracking expanding agent Download PDFInfo
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- CN105254207A CN105254207A CN201510638312.XA CN201510638312A CN105254207A CN 105254207 A CN105254207 A CN 105254207A CN 201510638312 A CN201510638312 A CN 201510638312A CN 105254207 A CN105254207 A CN 105254207A
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- sepiolite
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Abstract
The invention relates to the technical field of concrete admixtures, in particular to a concrete anti-cracking expanding agent. The concrete anti-cracking expanding agent is prepared from, by weight, 30-40 parts of calcium sulphoaluminate, 8-16 parts of sepiolite, 4-11 parts of polytetrafluoroethylene, 2-6 parts of nanometer SiO2 and 0.5-2.5 parts of silicone rubber. The concrete anti-cracking expanding agent is remarkable in anti-cracking effect, high in expansion rate, stable in performance and good in shrinkage compensating effect, and the strength of the concrete anti-cracking expanding agent can be matched with the strength of concrete.
Description
Technical field
The present invention relates to technical field of concrete additives, particularly a kind of concrete anticracking swelling agent.
Background technology
Concrete is in the initial stage and hydration process of condensation, capital produces chemical reaction and generates crystalline compounds, because crystalline compounds is less than volume of raw material, so volume of concrete can be caused to shrink, when shrinking the tensile stress produced and being greater than the ultimate tension of concrete member, just produce concrete cracking.For preventing and alleviating Overlong Concrete Structure temperature shrinkage fracture, effectively arranging post-cast strip is conventional measure, but post-cast strip extends the duration, and dabbing that what reinforcing bar was had no progeny take, weld and clear up all brings certain trouble to joint filling construction, processes badly will leave hidden danger.
Cement expansive material produces microdilatancy when concrete starts to shrink or before starting to shrink, stress is applied to concrete member, in order to offset, to slacken or balance the tensile stress caused due to contraction, thus reach the object that structurally internal stress is minimum, prevent crackle appearance, avoid cracking.
Swelling agent exists that expansion energy is low, rate of expansion does not mate with concrete coagulation core hydration reaction speed, volume is large, alkali content is high easily causes the unfavorable factors such as alkali-aggregate reaction in the market; Take CaO as the calcium oxide expansion agents of main component, there is the shortcomings such as speed of expansion is too fast, Bulking Time is short, expand and concrete shrinkage speed is inharmonious, not easily preserve; Take MgO as the magnesium oxide class swelling agent of main component, there is speed of expansion excessively slow, expansion start time far lags behind the concrete shrinkage time opening, cannot play the drawbacks such as cracking resistance effect.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of concrete anticracking swelling agent, and effect of prestressed is remarkable, and rate of expansion is high, stable performance, and compensate for shrinkage is made good use of, and can adapt with concrete intensity.
For achieving the above object, technical scheme to be solved by this invention is:
A kind of concrete anticracking swelling agent of the present invention, is made up of the raw material of following weight part: calcium sulphoaluminate 30 ~ 40 parts, sepiolite 8 ~ 16 parts, polytetrafluoroethylene powder 4 ~ 11 parts, Nano-meter SiO_2
22 ~ 6 parts, 0.5 ~ 2.5 part, silicon rubber powder.
Preferably, concrete anticracking swelling agent of the present invention, is made up of the raw material of following weight part: calcium sulphoaluminate 35 parts, sepiolite 12 parts, polytetrafluoroethylene powder 7 parts, Nano-meter SiO_2
24 parts, 1.5 parts, silicon rubber powder.
Preferably, the particle diameter of polytetrafluoroethylene powder of the present invention is 5 ~ 16 μm.In this particle size range of polytetrafluoroethylene powder, while compensate for shrinkage, can improve the intensity 4 ~ 6MPa of concrete middle and later periods.
Preferably, the particle diameter of sepiolite of the present invention is 40 ~ 90nm.When within the scope of this, cement expansive material of the present invention has best cracking resistance expansion character.
Of the present inventionly effectively to be:
1, rate of expansion of the present invention is high, compensate for shrinkage has long-lasting, can adapt with concrete strength development, there is excellent high cracking resistance barrier properties, the hidden danger avoiding anti-crack and anti-leakage of concrete performance to cause seepage ponding not cannot using, the tensile stress that different times produces due to cement contraction can be balanced or offset simultaneously, thus play the effect preventing concrete cracking, significantly improve resistance to cleavage.
2, the adaptation of product of the present invention is strong, is applicable to the concrete of different intensity grades, enhances the intensity of concrete middle and later periods and proper extension its time of coagulation simultaneously.
3, invention increases other each performance of cement expansive material, as seepage capability, concrete crushing strength and folding strength, its stable performance.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but the present invention is not limited to these embodiments.
Embodiment 1
1) raw material is taken by following weight part: calcium sulphoaluminate 30 parts, sepiolite 16 parts, polytetrafluoroethylene powder 11 parts, Nano-meter SiO_2
22 parts, 2.5 parts, silicon rubber powder;
2) the polytetrafluoroethylene powder mixing of 5 μm that to be the sepiolite of 90nm and particle diameter by particle diameter be, stirs; Then Nano-meter SiO_2 is added
2, stir; Cross 10min and add calcium sulphoaluminate again, cross 15min and finally add silicon rubber powder, obtain product.
Embodiment 2
1) raw material is taken by following weight part: calcium sulphoaluminate 33 parts, sepiolite 14 parts, polytetrafluoroethylene powder 9 parts, Nano-meter SiO_2
23 parts, 2 parts, silicon rubber powder;
2) the polytetrafluoroethylene powder mixing of 13 μm that to be the sepiolite of 80nm and particle diameter by particle diameter be, stirs; Then Nano-meter SiO_2 is added
2, stir; Cross 10min and add calcium sulphoaluminate again, cross 15min and finally add silicon rubber powder, obtain product.
Embodiment 3
1) raw material is taken by following weight part: calcium sulphoaluminate 35 parts, sepiolite 12 parts, polytetrafluoroethylene powder 7 parts, Nano-meter SiO_2
24 parts, 1.5 parts, silicon rubber powder;
2) the polytetrafluoroethylene powder mixing of 7 μm that to be the sepiolite of 75nm and particle diameter by particle diameter be, stirs; Then Nano-meter SiO_2 is added
2, stir; Cross 10min and add calcium sulphoaluminate again, cross 15min and finally add silicon rubber powder, obtain product.
Embodiment 4
1) raw material is taken by following weight part: calcium sulphoaluminate 38 parts, sepiolite 10 parts, polytetrafluoroethylene powder 5 parts, Nano-meter SiO_2
25 parts, 1 part, silicon rubber powder;
2) the polytetrafluoroethylene powder mixing of 10 μm that to be the sepiolite of 50nm and particle diameter by particle diameter be, stirs; Then Nano-meter SiO_2 is added
2, stir; Cross 10min and add calcium sulphoaluminate again, cross 15min and finally add silicon rubber powder, obtain product.
Embodiment 5
1) raw material is taken by following weight part: calcium sulphoaluminate 40 parts, sepiolite 8 parts, polytetrafluoroethylene powder 4 parts, Nano-meter SiO_2
26 parts, 0.5 part, silicon rubber powder;
2) the polytetrafluoroethylene powder mixing of 16 μm that to be the sepiolite of 40nm and particle diameter by particle diameter be, stirs; Then Nano-meter SiO_2 is added
2, stir; Cross 10min and add calcium sulphoaluminate again, cross 15min and finally add silicon rubber powder, obtain product.
The performance index of product technologies of the present invention, in table 1:
Table 1 concrete anticracking swelling agent of the present invention performance index
Claims (4)
1. a concrete anticracking swelling agent, is characterized in that, is made up of the raw material of following weight part: calcium sulphoaluminate 30 ~ 40 parts, sepiolite 8 ~ 16 parts, polytetrafluoroethylene powder 4 ~ 11 parts, Nano-meter SiO_2
22 ~ 6 parts, 0.5 ~ 2.5 part, silicon rubber powder.
2. concrete anticracking swelling agent according to claim 1, is characterized in that, is made up of the raw material of following weight part: calcium sulphoaluminate 35 parts, sepiolite 12 parts, polytetrafluoroethylene powder 7 parts, Nano-meter SiO_2
24 parts, 1.5 parts, silicon rubber powder.
3. concrete anticracking swelling agent according to claim 1 and 2, is characterized in that: the particle diameter of described polytetrafluoroethylene powder is 5 ~ 16 μm.
4. concrete anticracking swelling agent according to claim 1 and 2, is characterized in that: the particle diameter of described sepiolite is 40 ~ 90nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510638312.XA CN105254207A (en) | 2015-09-30 | 2015-09-30 | Concrete anti-cracking expanding agent |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510638312.XA CN105254207A (en) | 2015-09-30 | 2015-09-30 | Concrete anti-cracking expanding agent |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105254207A true CN105254207A (en) | 2016-01-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN201510638312.XA Pending CN105254207A (en) | 2015-09-30 | 2015-09-30 | Concrete anti-cracking expanding agent |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111362637A (en) * | 2020-03-15 | 2020-07-03 | 重庆金石源电力线路器材有限公司 | Cement-based telegraph pole |
| CN113387623A (en) * | 2021-07-02 | 2021-09-14 | 江苏晨马建筑科技有限公司 | Anti-cracking recycled concrete for engineering construction and preparation method thereof |
| CN115403288A (en) * | 2022-09-26 | 2022-11-29 | 河海大学 | Concrete anti-cracking agent and preparation method and use method thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090158964A1 (en) * | 2005-04-08 | 2009-06-25 | Howmedica Leibinger Inc. | Injectable calcium phosphate cement |
| CN104692751A (en) * | 2015-02-16 | 2015-06-10 | 陕西师范大学 | Earthen site grouting material of fiber bakelite rod grouted rock bolt based on water-based fluorine |
| CN104804666A (en) * | 2015-04-20 | 2015-07-29 | 许金兰 | High-yield low-cost starch adhesive and preparation method thereof |
-
2015
- 2015-09-30 CN CN201510638312.XA patent/CN105254207A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090158964A1 (en) * | 2005-04-08 | 2009-06-25 | Howmedica Leibinger Inc. | Injectable calcium phosphate cement |
| CN104692751A (en) * | 2015-02-16 | 2015-06-10 | 陕西师范大学 | Earthen site grouting material of fiber bakelite rod grouted rock bolt based on water-based fluorine |
| CN104804666A (en) * | 2015-04-20 | 2015-07-29 | 许金兰 | High-yield low-cost starch adhesive and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111362637A (en) * | 2020-03-15 | 2020-07-03 | 重庆金石源电力线路器材有限公司 | Cement-based telegraph pole |
| CN113387623A (en) * | 2021-07-02 | 2021-09-14 | 江苏晨马建筑科技有限公司 | Anti-cracking recycled concrete for engineering construction and preparation method thereof |
| CN115403288A (en) * | 2022-09-26 | 2022-11-29 | 河海大学 | Concrete anti-cracking agent and preparation method and use method thereof |
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Application publication date: 20160120 |