Jiangsu Research Institute of Building Science

Nanjing, China

Jiangsu Research Institute of Building Science

Nanjing, China
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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 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.


Yao F.,Hohai University | Shang S.,Hunan University | Liu K.,Jiangsu Research Institute of Building Science
Soil Dynamics and Earthquake Engineering | Year: 2014

Base isolation is an effective way to reduce earthquake energy transfer from ground to structure, but existing seismic isolation systems are not very suitable for rural buildings for some reasons. A new steel-asphalt composite layer for the seismic base isolation of housing units is present in this paper. Its dynamic characteristics and isolation effect are studied by shake table tests of two full-scale specimens. Different earthquake waves with different peak ground accelerations (PGA, from 0.1. g to 0.4. g) are input. Test results show that the isolation layer could efficiently reduce the input acceleration. Moreover, as the PGA increase, the isolation layer shows good function of the displacement limit. © 2014 Elsevier Ltd.


Liu H.-Q.,Jiangsu Research Institute of Building Science | Yin Z.-Z.,Hohai University
Yantu Lixue/Rock and Soil Mechanics | Year: 2010

The strength parameters are obtained with consideration of influence of wetting and drying cycles by an experiment based on laboratory direct shear test. The test basically reflects the phenomenon of crack evolution with wetting and drying cycles and reveals that crack evolution results in strength degradation. The results show that both cohesion and internal friction angle will attenuate along with crack evolution. Comparatively, cohesion index will be affected more obviously by crack and its determination should be more cautious. The law of attenuation accords with hyperbola; and the empirical expressions are proposed, which show that the relationship between attenuation of shear strength with increase of wetting and drying times is in fact with crack evolution. The expansive soil in engineering practice includes all kinds of cracks; therefore, in the design, the selection of strength parameters should consider the crack in the expansive soils. As the same time, the test method proposed makes the research of influence of crack evolution on the strength characteristics relatively simple and feasible.


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

The present invention discloses a testing method for self-desiccation effect on cement-based material. This method is able to test the humidity change of the cement-based material from final set to water being added for 1d so as to show the water consumption and self-desiccation process inside the cement-based material. The testing method for self-desiccation effect on cement-based material is to test the internal dew-point temperature of the cement-based material from final set to water being added for 1d, and afterwards to calculate the internal relative humidity of the cement-based material according to the equation (3). The testing method provided by the invention can test the humidity change of the cement-based material from final set to water being added for 1d so as to represent the water consumption and self-desiccation process inside the cement-based material. In addition, a testing method with different stages and covering the whole process is further provided to test the whole process of the relative humidity gradually falling from 100% when the cement-based material is shaped after addition of water under an enclosed condition. Consequently, it provides a theoretical basis for quantitative calculation of self-desiccation of the cement-based material.


Patent
Jiangsu Bote New Materials Co., Jiangsu Sobote New Materials Co. and Jiangsu Research Institute of Building Science | Date: 2013-10-30

The present invention provides a preparation method of hyperbranched polycarboxylic acid type copolymer cement dispersant, including: Monomer A, B and C undergo a free radical copolymerization in an aqueous medium. The molar ratio of Monomer A, Monomer B and Monomer C conforms to B/A-A-2-10 and C/(A+B-C)-0.02-0.08. Monomer A is expressed by General Formula (1), where R_(1) is H or a methyl; X_(1)=O, CH_(2)O, CH_(2)CH_(2)O; m is an integer from 5 to 200. Monomer B is expressed by General Formula (2), where R_(2) is H or COOM; R_(3) is H or CH_(3) and M is H, Na, K or NH_(4); Monomer C is expressed by General Formula (3), where R_(4) is H or methyl; X_(2)=O, CH_(2)O, CH_(2)CH_(2)O; Y=CH_(2), CH_(2)CH_(2), CH(CH_(3)), CH_(2)CH_(2)CH_(2), CH(CH_(3))CH_(2), C(CH_(3))_(2) and n is an integer from 5 to 200.


Shi L.,Jiangsu Research Institute of Building Science | Liu J.,State Key Laboratory of High Performance Civil Engineering Materials
Procedia Engineering | Year: 2012

Polymer coating is progressively being used in fields of concrete curing and concrete surface strengthening. However, only very few researches have been reported to investigate the effect of polymer coating on the properties of surface layer concrete. The effects of polymer coating on shrinkage, mechanical property, carbonation, capillary absorption and chloride ion diffusion of surface layer concrete were studied in the present investigation. The experimental results showed that polymer coating could obviously reduce the mortar shrinkage of the concrete surface, and the thicker the polymer coating, the greater shrinkage reducing ratio at early ages. It has been found that the polymer coating enhanced the mortar early age strength of the concrete surface. Meanwhile, the carbonation resistance of surface layer concrete, as well as the mortar infiltration resistance on the surface of concrete was improved by polymer coating. The results also demonstrated that the capillary absorption ratio of mortar in the surface layer of concrete cured under the polymer coating condition could be reduced by 87% and 78%, respectively compared with dry and standard curing conditions. In the same way, polymer coating had an improvement effect on chloride ion diffusion resistance of surface layer concrete. © 2011 Published by Elsevier Ltd.


Patent
Jiangsu Research Institute of Building Science | Date: 2011-07-08

A water-dispersible amphoteric polyurethane and a preparation method therefor. The water-dispersible amphoteric polyurethane is prepared from a polyisocyanate compound, a polyol compound, a dial compound having an anionic group or a potential anionic group, a compound having a tertiary or quaternary amine cationic group at least having two active H functional groups and a polyamine compound having a polyoxyethylene group. During preparation, the feeding order of the dial compound and the compound having a tertiary or low-molecular quaternary amine cationic group is controlled, and then neutralization and chain extension are performed, to obtain the target product. Also disclosed is a use of the water-dispersible amphoteric polyurethane in reinforcing concrete, wherein the water-dispersible amphoteric polyurethane is present in an amount of 0.1% to 5%, based on the total weight of the concrete.


Patent
Jiangsu Research Institute of Building Science | Date: 2011-12-30

Disclosed is a method for testing the self-drying effect of a cement-based material, capable of testing the change in humidity of the cement-based material after the final setting until the Id stage of adding water, so as to reflect the water consumption therein and the self-drying course. In the time period after the final setting of the cement-based material until the 1 d stage of adding water and forming, the dew-point temperature inside the cement-based material is tested, and then the relative humidity inside the cement-based material is calculated using a formula. The present invention can test the change in humidity of the cement-based material after the final setting until the Id stage of adding water, so as to reflect the internal water consumption therein and the self-drying course. Further provided is a multi -stage test method for the whole course, capable of testing the whole course of continuous reduction in relative humidity from an initial 100%, in sealed conditions, starting with adding water and formation of the cement-based material, so as to provide a theoretical foundation for the quantitative calculation of the self-drying and shrinking thereof.


Zhu X.B.,Jiangsu Research Institute of Building Science
Advanced Materials Research | Year: 2014

To explore the feasibility of the approach of "interfacial toughening in concrete", the 2D concrete model which possesses the characteristic of random distribution of spherical aggregates was used to simulate the relations between interface material and toughness of concrete containing flexible interfacial material. The influence of interfacial material on the toughness of concrete was calculated with elastic modulus, thickness and the displacement at peak load for variables. And the results show that: The peak width of the concrete's load-displacement curve is increased evidently with the ultimate displacement also improved evidently upon replacing the normal ITZ with flexible interface phase material; the concrete's peak load, the displacement at peak load and the fracture energy increase gradually with the increase of the elastic modulus of interface phase material. When the elastic modulus exceeds 50MPa, the concrete's peak load will exceed that of normal concrete promptly with the displacement at peak load and the fracture energy all reaching the maximal value; With the gradual increase of the thickness of interface phase material, the concrete's peak load declines gradually while the displacement at peak load increases gradually; The concrete's fracture energy and ductility coefficient approximately increase first and then decline with the change of thickness. When the thickness is 0.2mm, the concrete's fracture energy and ductility coefficient reach the optimal value in setting scope. With the gradual increase of the interface phase material's displacement at peak load, the concrete's peak load increases gradually while its fracture energy and ductility coefficient increase first and then decline. When the displacement at peak load is 0.05, the two reach the optimal value; when the displacement at peak load exceeds 0.05, the cracks will extend from the aggregates-mortar base debonding to the mortar matrix. The results have certain exploration value for developing concrete toughening technology. © (2014) Trans Tech Publications, Switzerland.

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