This code was formulated according to the arrangement in Document (JIZONG [1996], No.40) of the Ministry of Power Industry - “Power Industry Standard Plan in 1996”.
Blend the polymer emulsion or water soluble polymer into the newly-mixed cement mortar to greatly improve the performance of ordinary cement mortar, the prepared organic-inorganic compound material is called as Polymer Modified Cement Mortar (hereinafter referred to as PMC).
Such material has higher tensile strength, its performances such as gluing, water resistance and corrosion resistance are higher than the ordinary cement mortar. In order to adapt to the popularization and application of such material, the standard test methods for polymer modified cement mortar were established in America, Britain, German, Japan and other countries. The American Concrete Institute (ACI) established 548 committees to specially take in charge of polymer concrete, they organized the research units and universities concerned to establish the test code for PMC through modification and supplementation based on the concrete test method of the U.S. Bureau of Reclamation. The Federal Highway Administration (FHWA) established the technical standard for the application of polymer modified cement mortar in bridge deck repair. Both Japan Concrete Institute (JCI) and German Association for Bridge and Structural Engineering specially established the standards for performance test of polymer modified cement mortar. The testing methods and quality standards for PMC were included in both Japanese Industrial Standards (JIS) and Britain Standards (BS).
The polymer modified cement mortar has been studied and applied for more than 30 years in China, and has been widely used in the repair of defect and breakage of such concrete structures as water resources and hydropower engineering, harbor engineering, bridge, tunnel, subway, highway and municipal engineering, the anti-seepage & anti-corrosion treatment and repair of freezing thawing erosion of concrete surface, and the treatment of new-to-old concrete interface. However, the uniform test code and technical standard have not yet been established in the long term, which is adverse to the popularization and application of this technology. Therefore, the editors undertook the task to compile the PMC test code, and compiled this test code by making reference to the domestic and foreign relevant data and combining with the actual situation of China.
Appendix A and Appendix B of this standard are normative.
This standard was proposed by China Institute of Water Resources and Hydropower Research.
This standard is under the jurisdiction of Standardization Administration of Power Industry on Water Resources and Hydropower Construction.
Prepared by: China Institute of Water Resources and Hydropower Research.
Chief drafters of this standard: Mai Shufang, Wu Huaiguo and Wang Yi.
China Institute of Water Resources and Hydropower Research is entrusted to take charge of the explanation of this standard.
1 Scope
This code specifies the test methods, technical requirements and other contents of the polymer modified cement mortar and its raw materials as well as mixtures.
This code is applicable to the performance tests of polymer modified cement mortar, covering the test of raw materials, preparation and test of mixtures, the molding and curing of test pieces and test methods for all the physical and mechanical properties of mortar.
2 Normative References
The following documents contain provisions which, through reference in this text, constitute provisions of this standard. At time of publication, the editions indicated were valid. All standards are subject to revision, and the parties adopting this standard are encouraged to study whether the latest editions of the following standards are applicable.
GB 175-1999 Portland Cement and Ordinary Portland Cement
GB/T 1346-1989 Standard Test Method for Water Requirement for Normal Consistency Setting Time and Soundness of the Portland Cement
GB/T 14684-1993 Sand for Building
GB/T 17671-1999 Method of Testing Cements - Determination of Strength
SD 105-1982 Test Code for Hydraulic Concrete
3 Terminologies and Symbols
3.1 Definitions of Terminologies
3.1.1 Polymer modified cement mortar
The mortar that is mixed with cement, fine aggregate, water-dispersible or water-soluble polymer and adequate amount of water according to a definite mix proportion.
3.1.2 Polymer modifier
The generic term of water-soluble or water-dispersible polymers incorporated for the modification of cement mortar.
3.1.3 Polymer emulsion (or latex)
The polymerized emulsion (or copolymerized emulsion) formed by monomers (one kind of monomer, two or more kinds of different monomers) through emulsion polymerization, which also may be the polymer emulsion formed by liquid resins through emulsification. The emulsion system includes polymer, emulsifier, stabilizer, dispersing agent and antifoaming agent, etc.
3.1.4 Solid content
The percent ratio of the sum of mass of polymer, emulsifier, stabilizer and other solid compositions contained in polymer emulsion to the total mass of emulsion.
3.1.5 Polymer-cement ratio
