{"id":108935,"date":"2024-10-18T15:26:23","date_gmt":"2024-10-18T15:26:23","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/astm-c457-1998\/"},"modified":"2024-10-24T21:49:04","modified_gmt":"2024-10-24T21:49:04","slug":"astm-c457-1998","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/astm\/astm-c457-1998\/","title":{"rendered":"ASTM-C457 1998"},"content":{"rendered":"

ASTM C457-98<\/h3>\n

Historical Standard: Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete<\/h4>\n
\n

ASTM C457<\/h4>\n

Scope<\/strong><\/p>\n

1.1 This test method describes procedures for microscopical determinations of the air content of hardened concrete and of the specific surface, void frequency, spacing factor, and paste-air ratio of the air-void system in hardened concrete (1). Two procedures are described:<\/p>\n

1.1.1 Procedure A , the linear-traverse method (2, 3).<\/p>\n

1.1.2 Procedure B , the modified point-count method (3, 4, 5, 6).<\/p>\n

1.2 This test method is based on prescribed procedures that are applied to sawed and lapped sections of specimens of concrete from the field or laboratory.<\/p>\n

1.3 It is intended to outline the principles of this test method and to establish standards for its adequate performance but not to describe in detail all the possible variations that might be used to accomplish the objectives of this test method.<\/p>\n

1.4 The values stated in inch-pound units are to be regarded as the standard.<\/p>\n

1.5 This standard does not purport to address all of the safety problems associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For specific hazard statements see Notes 3 and 6.<\/p>\n

Keywords<\/strong><\/p>\n

Air content; Air voids; Concrete-air content; Concrete-hardened; Linear traverse (Rosiwal) method; Microscopic examination-concrete; Modified point-count method; Petrographic analysis; Pore structure; air-void content\/parameters of air-void system in hardened concrete, by; microscopical determination, test,; Spacing factor; Surface analysis-concrete; air-void content (in hardened concrete), test<\/p>\n

ICS Code<\/strong><\/p>\n

ICS Number Code 91.100.30 (Concrete and concrete products)<\/p>\n

DOI:<\/strong> 10.1520\/C0457-98<\/p>\n<\/div>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
PDF Pages<\/th>\nPDF Title<\/th>\n<\/tr>\n
1<\/td>\nScope
Referenced Documents
Terminology <\/td>\n<\/tr>\n
2<\/td>\nSummary of Test Method
Significance and Use <\/td>\n<\/tr>\n
3<\/td>\nApparatus and Materials for Sample Preparation (for either procedure)
Sampling (for either procedure)
Preparation of Sections (for either procedure)
TABLE 1 <\/td>\n<\/tr>\n
4<\/td>\nApparatus for Measurement of Specimens <\/td>\n<\/tr>\n
5<\/td>\nFIG. 1 <\/td>\n<\/tr>\n
6<\/td>\nProcedure
FIG. 2 <\/td>\n<\/tr>\n
7<\/td>\nFIG. 3
TABLE 2 <\/td>\n<\/tr>\n
8<\/td>\nCalculation
Apparatus for Measurement of Specimens <\/td>\n<\/tr>\n
9<\/td>\nProcedure
FIG. 4 <\/td>\n<\/tr>\n
10<\/td>\nFIG. 5 <\/td>\n<\/tr>\n
11<\/td>\nCalculation
TABLE 3 <\/td>\n<\/tr>\n
12<\/td>\nReport
Precision and Bias
TABLE 4
TABLE 5 <\/td>\n<\/tr>\n
13<\/td>\nKeywords
REFERENCES
TABLE 6
TABLE 7 <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

C457-98 Standard Test Method for Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ASTM<\/b><\/a><\/td>\n1998<\/td>\n14<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":108936,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[1258,2637],"product_tag":[],"class_list":{"0":"post-108935","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-91-100-30","7":"product_cat-astm","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/108935","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/108936"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=108935"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=108935"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=108935"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}