A new building material patent: concrete mixed material with middle and low strength is invented.
介绍了一项最新建材专利技术中低强度等级混凝土掺合料技术。
The sand is lack in the western China, so preparing self-compacting concrete with low and middle strength with Super Fine Mountain Sand and Artifical Sand is necessary.
西部地区河砂匮乏，应用特细山砂和机制砂配制中低强度等级的自密实混凝土是西部地区迫切需要开发的混凝土工程技术。
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