1905.6.2 Frequencyoftesting.The frequency of conduct-ing strength tests of concrete and the minimum number of tests shall be as specified in ACI 318, Section 5.6.2. ACI 301 has always contained limits on the minimum and maximum temperatures of delivered concrete for both hot and cold weather concrete applications. The minimum reinforcement ratio controls the cracking of concrete members. To control cracks to a … 0
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ACI also limits the rebar spacing of beams and one-way slabs as a function of the steel stress under service loads (fs) in Section 10.6.4. -Concrete temperature (2.3) The concrete temperature at the time of placement should not be lower than the values given in Table 3.1, also the concrete temperature should be maintained at the recommended placement temperature for the required protection period. (T or F) 2. %PDF-1.7
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Typical values are between 80° and 95° F as measured by ASTM C 1064-86. �
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�L#�N"�"��=p�nλ5���ٿ�� The minimum amount and spacing of reinforcement to be used in structural floors, roof slabs, and walls for control of temperature and shrinkage cracking is given in ACI 318 or in ACI 350R. • Minimum – If 3 day average less than 40 degrees, concrete 40 to 55 degrees depending on concrete dimensions. the temperature of the fresh concrete when preparing speci-mens for strength tests. Note 2: For Lines 2-4, maximum temperature is minimum temperature in the table plus 15 °F (9 °C). 4. %PDF-1.5
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FOR WALLS: For Vertical Steel. The American Concrete Institute (ACI) specifies in ACI 306R-16 Guide to Cold Weather Concreting recommended concrete temperatures based on the air temperature. f min = 0.0025. Concrete Joints • Construction Joints • Expansion Joints Design temperature & shrinkage reinforcement. For Horizontal Steel. H���Oo�@���)�H�j���W�"5�TTJ� Box 9094 Farmington Hills, Mich. 48333-9094 American Petroleum Institute (API) Production Department 211 N. Ervay, Suite 1700 Dallas, Tex. K������1��rxF�$;��wR��`M�yÄw�j��w�!���c��d/�D�"����6D��kDK�c�e��U����Q�*f��M�ae����R�rN}�s�{9��!Ě�2��b��s���X�n8���^�k;X=�2|uٷ�`a̪�����]�We������:��f��ϔ��d���ڇ��|a$��C�7�~�߂� Q]�X����T�h���� ��-
ACI 318 indicates a minimum reinforcement of 0.0018 to control shrinkage and temperature effects. k.-���� ��;a
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$2H��ei�y�ҿ |Va �� ��ս��$N�in��@Z��m5��E3��y$��г�� The minimum ratio of required reinforcement is; FOR SLABS: f min = 0.002 (for f y = 40,000 psi). endstream
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Cold weather period, as defined by ACI Committee 306, is when one of the following conditions occur for three consecutive days: Average daily air temperature is less than 40 o F "u�1�
dk�L�&�J�"/G�x�'0���A*. If you have a 3ft thick section, then you can just look at top 1ft and bottom 1ft individually for minimum T & S steel. The loss of volume causes the concrete to shrink, k��o2*�;e��F�\�/U�e���i���O�Ŕ�vWN_��U�5Pq!��I����+"hȡ��{ �'��A��z���@g�uK$��"�ρ`�b������V-�o覘x>�XJ�6�oh;� ��I�E�;�U�::�9�5�tq�kk�V�I��>�F�lR��q��F6���9X�U�k\l 1597 0 obj
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The American Concrete Institute (ACI) specifies in ACI 306R-16 Guide to Cold Weather Concreting recommended concrete temperatures based on the air … Concrete international MAY 2014 47 below 32°F [0°C]).5 However, given the recommendations in ACI 306R-10,4 ACI 306.1-90,3 and ACI 301-10,2 the minimum concrete temperature as placed must be at least 40°F (5°C). The minimum-reinforcement percentage, which is between 0.18 and 0.20%, does not normally control cracks to within generally acceptable design limits. endstream
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