Jiangsu Sobute New Materials Co.

Nanjing, China

Jiangsu Sobute New Materials Co.

Nanjing, China
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Li M.,Jiangsu Sobute New Materials Co. | Liu J.,Nanjing Southeast University | Tian Q.,Jiangsu Sobute New Materials Co. | Wang Y.,Nanjing Southeast University | Xu W.,Jiangsu Sobute New Materials Co.
Construction and Building Materials | Year: 2017

The benefits of internal curing (IC) have been confirmed by extensive laboratory studies under constant room temperature. In practical engineering, sidewall concrete undergoes a variable temperature evolution, which involves significant physical, chemical, and thermal changes during the hydration process at the early age and a high cracking risk at the temperature drop stage. Expansive agent (EA) has always been used to mitigate early-age cracking, but it has limited efficacy in the temperature drop stage and low mechanical properties. This study examines the efficacy of IC through pre-soaked lightweight aggregate (SLWA) and the combined use of SLWA and EA in mitigating shrinkage deformation under constant and variable temperature conditions. Results indicate that SLWA shows a higher efficacy than EA in mitigating shrinkage deformation during the temperature drop stage and can provide continuous expansion at the later stage. The combined use of SLWA and EA exhibits high efficacy in mitigating shrinkage deformation under constant and variable temperature conditions and can limit the reduction of mechanical properties caused by a single EA. © 2017


Ma R.,Nanjing Southeast University | Guo L.,Nanjing Southeast University | Guo L.,Advanced Civil Engineering Materials Collaborative Innovation Center | Sun W.,Nanjing Southeast University | And 4 more authors.
Materials and Structures/Materiaux et Constructions | Year: 2017

An economical and ecological (ECO) ultra-high performance fibre reinforced cementitious composite (UHPFRCC) with a high volume of mineral admixture as part of the binding materials and river sand as the aggregate was designed. The flowability and strength development of ECO-UHPFRCC with various dosages of nano-silica were studied. The effects of nano-silica on the morphology of hardened matrix microstructure and the hydrates characteristics were investigated by SEM, XRD, TG and nano-indentation. The results demonstrated that the mechanical properties of the ECO-UHPFRCC were significantly improved with the increased dosage of nano-silica; its compressive strength exceeded 200 MPa after 3 days of steam curing when mixed with 4% by weight of nano-silica. The static mechanical properties of ECO-UHPFRCC were enhanced as a result of the optimized micro-properties. The mechanism of the effects of nano-silica on the performance of ECO-UHPFRCC microstructure were investigated and discussed as well. © 2017, RILEM.


Wei T.,Jiangsu Sobute New Materials Co. | Wei T.,State Key Laboratory of High Performance Civil Engineering Materials | Hong J.,Jiangsu Sobute New Materials Co. | Hong J.,State Key Laboratory of High Performance Civil Engineering Materials | Lin J.,Jiangsu Research Institute of Building Science
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2017

The strength development of cold regeneration with asphalt emulsion(CRAE) under the constant environment condition was revealed by indoor simulation test, and then the strength contribution in different periods under the conditions of different content of cement and asphalt emulsion was studied. The cement hydration process in cement emulsified asphalt mortar, and asphalt emulsion demulsification process were analyzed by micro analysis method such as ESEM et al. The results indicate that the development of strength of CRAE shows the long-term mode that not only the rapid growth in the early stage and the slow growth in the late stage, but also the early and late strength can be promoted significantly by cement. It has also shown that the larger the content, the higher the amplitude; cement contributes to the rapid improvement of early strength. Demulsification asphalt provides the main source of strength. At the best asphalt emulsion content maximum early or late strength can be achieved. The early cement hydration reaction can be inhibited by asphalt emulsion and the effect of cement on asphalt emulsion demulsification is mainly reflected by the attraction of cement particles and the particles agglomeration due to the hydration product. The reinforced structure formed by cement hydration products and asphalt can promote the strength further. © 2017, Editorial Department of Journal of Building Materials. All right reserved.


Gao N.,Jiangsu Sobute New Materials Co. | Ran Q.,Jiangsu Sobute New Materials Co. | Qiao M.,Jiangsu Sobute New Materials Co.
Jianzhu Cailiao Xuebao/Journal of Building Materials | Year: 2017

Using the principle of saponification reaction, a new fatty acid salt thixotropic agent was developed by investigating the effects of solvent content, alkali content and kinds of oils and fats on the thixotropic of cement paste. The rheological properties and constant torque in different periods were tested. The result shows that, the cement paste has outstanding thixotropy when incorporating new thixotropic agent. The cement paste is in relatively steady state when it is allowed to stand, but when a special shear stirs the cement paste, it is in a fluid-like state. The fluidity of cement paste is very stable. © 2017, Editorial Department of Journal of Building Materials. All right reserved.


Qiao M.,Nanjing University | Qiao M.,Jiangsu Sobute New Materials Co. | Chen J.,Jiangsu Sobute New Materials Co. | Yu C.,Jiangsu Sobute New Materials Co. | And 3 more authors.
Cement and Concrete Research | Year: 2017

The development of high performance air entraining agents for concrete is of great importance. In this work, gemini surfactants (a new class of surfactants) have been utilized as air entraining agents for the first time. Three gemini surfactants modified with different anionic groups (sulfonic, sulfate and phosphate groups) were designed and synthesized. The surface tensions and foam heights of their solutions were tested. Using them as the air entraining agents, the air contents and air-void parameters of the cement mortars were tested. The study results clearly show that the gemini surfactants have higher surface activity, foamability, foam stability and air entraining performance compared with the corresponding single-chained surfactants, and the sulfate group modified gemini surfactant has the highest performance. These surfactants are tested merely as model compounds; however, they show higher air entraining ability compared with the benchmark surfactants used in the industry, indicating great potential for practical applications. © 2017 Elsevier Ltd


Wang X.,Jiangsu Sobute New Materials Co. | Ran Q.,Jiangsu Sobute New Materials Co. | Yang Y.,Jiangsu Sobute New Materials Co. | Shu X.,Jiangsu Sobute New Materials Co.
Advances in Cement Research | Year: 2016

Polycarboxylate ether superplasticiser (PCE) with different molecular weights but the same length and density of side chains with a block distribution was successfully synthesised through reversible addition-fragmentation chain transfer polymerisation (RAFT). The influence of molecular weight on the performance in cement paste was systematically investigated by measuring the flowability of fresh cement paste, rheology properties, conformation in solution and adsorption characteristics. The results illustrate that when the molecular weight is relatively small, the number of carboxylic groups from the backbone accessible for the cement particle surfaces is too small to have good dispersion. However, PCE with a relatively large molecular weight may be co-precipitated with early cement hydration products owing to rapid adsorption kinetics. Moreover, PCE of much larger molecular weight leads to larger adsorption amounts from the view of both kinetics and thermodynamics. In addition, the flowability and the yield stress are closely related to adsorption amount. An important finding is that the dispersion ability of PCE can be improved with an increase in molecular weight within a certain interval. © 2016, ICE Publishing. All rights reserved.


Wang X.,Jiangsu Sobute New Materials Co. | Ran Q.,Jiangsu Sobute New Materials Co. | Yang Y.,Jiangsu Sobute New Materials Co. | Shu X.,Jiangsu Sobute New Materials Co. | Yu C.,Jiangsu Sobute New Materials Co.
Journal of Materials in Civil Engineering | Year: 2016

Different polycarboxylate (PC) superplasticizers have been successfully synthesized by varying side-chain density as well as sequence structure through free radical polymerization and reversible addition-fragmentation chain transfer polymerization (RAFT), respectively. Characteristic connections between molecular structure and early age properties of cement paste have been systematically evaluated by various methods, such as adsorption, flowability, calorimetric measurements, amount of hydration product, and dissolution of cement grains. The results show that block PC adsorbs faster with a larger adsorption amount onto cement particle surfaces than random PC, thereby having a better initial flowability and faster loss of workability. Moreover, the dormant period of cement paste with block PC could be effectively shortened by 3 h with block PC as well as the onset of the acceleratory period could be promoted. The results from X-ray diffraction (XRD)-Rietveld refinement show that block PC promotes both C3A and C3S reaction than that of random PC. In addition, a larger number of clusters of C-S-H is formed on the cement particle surfaces at the very early age with block PC and then C-S-H clusters developed a continuous structure with prolonged time, which may increase the early strength of cement paste. Furthermore, the dissolution rate of cement minerals is drastically faster with block PC compared with random PC. All these findings are helpful not only for understanding the relationship of the molecular structure of PC and the early age properties of cement paste, but also further designing the optimum molecular structure of PC to meet the requirement of continuous materials with early strength. © 2016 American Society of Civil Engineers.


Patent
Jiangsu Sobute New Materials Co., Jiangsu Research Institute of Building Science, Nanjing Bote Building Materials Co and Jiangsu Bote New Materials Co. | Date: 2014-05-14

The present invention relates to a water-dispersible amphoteric polyurethane and a preparation method for it. The water-dispersible amphoteric polyurethane is prepared from polyisocyanate compound, polyol compound, diol compound containing an anionic group or a potential anionic group, tertiary or quaternary amine cationic group compound containing at least two active H functional groups and polyamine compound containing polyoxyethylene. During preparation, the diol compound and tertiary or low-molecular quaternary amine cationic group compound shall be controlled for the dosing order, and then neutralized and chain-extended to finally get the target product. The present invention further relates to the application of the water-dispersible amphoteric polyurethane in reinforced concrete, wherein the dosing amount is 0.1 - 5% of the total mass of the concrete.


Patent
Jiangsu Sobute New Materials Co. | Date: 2011-12-30

Disclosed is a method for testing the setting time of a cement-based material: testing the capillary negative pressure of a non-bleeding cement-based material, with the time at which the capillary negative pressure reaches a threshold value A as the initial setting time, and/or the time at which the capillary negative pressure reaches a threshold value B as the final setting time, wherein threshold value A is 8-10 kPa, and threshold value B is 54-56 kPa. Alternatively, threshold value A and threshold value B are determined by the following method: formulating a cement-based material for the determination of threshold values with the same raw materials at the same formulation ratio; after vibration-compaction, placing a portion into a measuring mold; after vibration-compaction, testing the capillary negative pressure of the non-bleeding cement-based material placed in the measuring mold; under the same conditions, synchronously testing and determining the initial setting time and final setting time of the cement-based material for the determination of threshold values by a penetration resistance method; the capillary negative pressure corresponding to the initial setting time and final setting time of the cement-based material for the determination of threshold values are respectively threshold value A and threshold value B. The method can not only be used in standard tests for a laboratory cement setting time under standard temperature conditions, but can also be used to realize remote, automatic, and continuous in situ monitoring for the setting time of a cast-in-situ concrete structure.


Patent
Jiangsu Bote New Materials Co., Jiangsu Sobute New Materials Co. and Jiangsu Research Institute of Building Science | Date: 2014-06-25

The present invention relates to a method for testing the setting time of cement-based materials, comprising: test the meniscus depression of cement-based materials without bleeding, take the time when the meniscus depression arrives at threshold A as the initial setting time and/or the time when the meniscus depression arrives at threshold B as the final setting time, wherein threshold A = 8 - 10kPa and threshold B = 54 - 56kPa; or thresholds A and B are determined by the following method: prepare the cement-based materials for the determination of the thresholds through the same mix proportions and raw materials, make the mixture compact by vibration, place some in a test mold and test the meniscus depression of cement-based materials without bleeding in the test mold after compact vibration, under the same conditions, test the initial setting time and final setting time of cement-based materials for determination of the thresholds at the same time by penetration resistance method, wherein the meniscus depressions corresponding to the initial setting time and the final setting time of cement-based materials for the determination of the thresholds are thresholds A and B respectively.

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