{"id":380606,"date":"2024-10-20T03:07:39","date_gmt":"2024-10-20T03:07:39","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/aci-237-2-2021\/"},"modified":"2024-10-26T05:40:00","modified_gmt":"2024-10-26T05:40:00","slug":"aci-237-2-2021","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/aci\/aci-237-2-2021\/","title":{"rendered":"ACI 237.2 2021"},"content":{"rendered":"

Given the high flowability and relatively fast casting rate of self-consolidating concrete (SCC), such concrete can exert high form pressure. Accurate assessment of form pressure is necessary from safety and economic points of view. The maximum form pressure and pressure decay are dependent on the structural buildup of the concrete at rest following placement, as well as on the placement parameters. The structural buildup at rest is affected by the thixotropy of the mixture. This report presents information on key parameters, including constituent materials; mixture proportioning; and casting parameters such as the casting rate, concrete temperature, and reinforcement percentage, affecting thixotropy and SCC form pressure. Prediction models available for estimating SCC form pressure are presented. Findings from two round-robin field studies conducted to validate these models are also discussed. This report should be of interest to concrete professionals, including concrete suppliers and formwork designers, because it covers: 1) the influence of SCC proportions and casting parameters on form pressure; 2) means to estimate formwork pressure with examples; and 3) techniques to measure formwork pressure in field applications. Keywords: form pressure; lateral pressure; self-consolidating concrete; structural buildup at rest; thixotropy.<\/p>\n

PDF Catalog<\/h4>\n\n\n\n\n\n\n\n\n\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
3<\/td>\nTITLE PAGE <\/td>\n<\/tr>\n
4<\/td>\nCHAPTER 1\u2014INTRODUCTION
1.1\u2014Introduction <\/td>\n<\/tr>\n
5<\/td>\n1.2\u2014Scope
1.3\u2014Use of U.S. Customary Units in this report <\/td>\n<\/tr>\n
6<\/td>\nCHAPTER 2\u2014NOTATION AND DEFINITIONS
2.1\u2014Notation
2.2\u2014Definitions
CHAPTER 3\u2014THIXOTROPY AND FORM PRESSURE
3.1\u2014Thixotropy <\/td>\n<\/tr>\n
7<\/td>\n3.2\u2014Thixotropy test methods <\/td>\n<\/tr>\n
11<\/td>\n3.3\u2014Influence of thixotropy on form pressure <\/td>\n<\/tr>\n
13<\/td>\nCHAPTER 4\u2014EFFECT OF MIXTURE CHARACTERISTICS ON FORM PRESSURE
4.1\u2014Introduction
4.2\u2014Binder constituents and content <\/td>\n<\/tr>\n
14<\/td>\n4.3\u2014Water content
4.4\u2014Aggregate characteristics <\/td>\n<\/tr>\n
15<\/td>\n4.5\u2014Chemical admixtures <\/td>\n<\/tr>\n
16<\/td>\nCHAPTER 5\u2014EFFECT OF CASTING PARAMETERS ON FORM PRESSURE
5.1\u2014Introduction
5.2\u2014SCC mixture temperature
5.3\u2014Casting rate <\/td>\n<\/tr>\n
17<\/td>\n5.4\u2014Formwork characteristics <\/td>\n<\/tr>\n
18<\/td>\n5.5\u2014Reinforcement percentage <\/td>\n<\/tr>\n
19<\/td>\nCHAPTER 6\u2014PREDICTION MODELS FOR SCC FORM PRESSURE
6.1\u2014Introduction
6.2\u2014Model by Gardner et al. (2012)
6.3\u2014Model by Khayat and Omran (2010b) <\/td>\n<\/tr>\n
20<\/td>\n6.4\u2014Model by Tejeda-Dominguez et al. (2005) <\/td>\n<\/tr>\n
21<\/td>\n6.5\u2014Model by Ovarlez and Roussel (2007)
CHAPTER 7\u2014MEASUREMENT TECHNIQUES
7.1\u2014Strain-gauge-based pressure sensor setup <\/td>\n<\/tr>\n
23<\/td>\n7.2\u2014Pressure reading graph example
7.3\u2014Precautions and maintenance when measuring form pressure
CHAPTER 8\u2014FIELD VALIDATION OF PREDICTION MODELS
8.1\u2014Stockholm, Sweden, 2012 <\/td>\n<\/tr>\n
25<\/td>\n8.2\u2014Toronto, Canada, 2014 <\/td>\n<\/tr>\n
28<\/td>\n8.3\u2014Validation of models <\/td>\n<\/tr>\n
29<\/td>\n8.4\u2014Considerations for formwork design
CHAPTER 9\u2014SUMMARY
CHAPTER 10\u2014REFERENCES
Authored references <\/td>\n<\/tr>\n
31<\/td>\nAPPENDIX A\u2014EXAMPLE CALCULATIONS <\/td>\n<\/tr>\n
32<\/td>\nA1\u2014Calculation of form pressure using model by Gardner et al. (2012)
A2\u2014Calculation of form pressure using model by Khayat and Omran (2010b) <\/td>\n<\/tr>\n
33<\/td>\nA3\u2014Calculation of form pressure using model by Tejeda-Dominguez et al. (2005)
A4\u2014Calculation of form pressure using model by Ovarlez and Roussel (2007) <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

ACI PRC-237-2.21: Form Pressure Exerted by Self-Consolidating Concrete: Primary Factors and Prediction Models – Report<\/b><\/p>\n\n\n\n\n
Published By<\/td>\nPublication Date<\/td>\nNumber of Pages<\/td>\n<\/tr>\n
ACI<\/b><\/a><\/td>\n2021<\/td>\n36<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":380610,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[2650],"product_tag":[],"class_list":{"0":"post-380606","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-aci","8":"first","9":"instock","10":"sold-individually","11":"shipping-taxable","12":"purchasable","13":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/380606","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\/380610"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=380606"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=380606"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=380606"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}