Xem 1-12 trên 12 kết quả Portland cement
  • SCOPE To determine the slump loss of freshly mixed Portland Cement Concrete over a period of time. This method is typically used for drilled shaft concrete. It may also be applicable in special circumstances as deemed necessary by the RCE. The purpose of this test is to ensure that drilled shaft concrete has a slump within the range specified in Subsection 701.2.12.3 of the 2007 edition of SCDOT’s Standard Specifications For Highway Construction when placed and maintains a minimum slump as specified in Subsection 712.4.13.

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  • This standard is issued under the fixed designation C 150; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense.

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  • Instructions: Check each test method for which you are requesting accreditation. NVLAP Code ADMIXTURES _____ 02/A35 _____ 02/A36 ASTM C233 ASTM C311 Testing Air-Entraining Admixtures for Concrete Sampling and Testing Fly Ash or Natural Pozzolans for Use as a Mineral Admixture in Portland Cement Concrete Effectiveness of Mineral Admixtures in Preventing Excessive Expansion of Concrete Due to the AlkaliAggregate Reactions Test Method Designation.

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  • Tiêu chuẩn này áp dụng cho loại xi măng poóc lăng toả nhiệt ít và toả nhiệt vừa (gọi chung là xi măng poóc lăng ít toả nhiệt), dùng để thi công các công trình xây dựng thuỷ điện, thuỷ lợi, giao thông…

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  • Concrete can be classified as composite material and that is a combination of different components which improve their performance properties. In general case binder component which can be in hard crystalline or amorphous state is considered as the matrix of composite material. In concrete matrix phase the grains of aggregates (dispersed phase) are uniformly distributed.

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  • This standard is issued under the fixed designation C 452; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

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  • This standard is issued under the fixed designation C 359; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

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  • This publication was commissioned by the Reinforced Concrete Council, which was set up to promote better knowl- edge and understanding of reinforced concrete design and building technology. The Council’s members are Co-Steel Sheerness plc and Allied Steel & Wire, representing the major suppliers of reinforcing steel in the UK, and the British Cement Association, representing the major manufacturers of Portland cement in the UK. Charles Goodchild is Senior Engineer for the Reinforced Concrete Council. He was responsible for the concept and management of this publication....

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  • Portland Cement - Xi măng Portland là một chất kết dính thủy lực hoạt động, tức là một "chất kết dính để thiết lập và cứng lại bởi sự tương tác hóa học với nước và có khả năng làm như vậy dưới nước mà không có sự bổ sung của một hoạt hóa như vôi" (BS 6100, phần 6,1, 1984). Đó là thu được bằng cách đốt cháy, ở nhiệt độ clinke (khoảng 1450 ° C), một hỗn hợp đồng nhất định trước của các vật liệu bao gồm vôi (CaO), silic (SiO2), một tỷ lệ nhỏ các...

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  • This standard is issued under the fixed designation C 115; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

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  • This standard is issued under the fixed designation C 265; the number immediately following the designation indicates the year of original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A superscript epsilon (e) indicates an editorial change since the last revision or reapproval.

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  • Countries around the world are adopting the practice of using waste products and other alternatives to replace fossil fuels in cement manufacturing. Industrialized countries have over 20 years of successful experience (GTZ and Holcim 2006). The Netherlands and Switzerland, with respective national substitution rates of 83% and 48%, are world leaders in this practice (Cement Sustainability Initiative 2005). In the US, it is common for cement plants to derive 20-70% of their energy needs from alternative fuels (Portland Cement Association 2006).

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