For Horizontal Steel. Concrete Temperature Limits ACI 301.5, ACI 301, and ASTM C94 set no temperature limit on fresh concrete in hot weather conditions if precautions are considered in proportioning, production, delivery, placing, and curing concrete. Previous versions specified a maximum concrete temperature of 90°F. Some concrete specifications contain a maximum temperature for the freshly mixed concrete as delivered. 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 The objectives are to prevent damage from early-age freezing (when the concrete is still saturated), to make sure the concrete develops the needed strength, and to limit rapid temperature changes or large temperature differentials that cause cracking. If you have a 3ft thick section, then you can just look at top 1ft and bottom 1ft individually for minimum T & S steel. R����\$�5���ˢa�nw��n�����ۓ֫'=��lH�R6h���=�?ʑߑ���wRo&����>=�o�<3@5���i]6h^�׫�X>֘m��5�#�;@z�g � �����j��H㘗��ۨA�l�)�Iǻk֍*�ԯs�5��=���g��X���:��� The temperature reinforcement shall not be less than ½ inch at nine 9 inch center to center. h�b```a``�"W&11 �+P����i�B�CrOH���.���Ix���}���z*�@��+&O'%.�u�^�;G0��n�2�F� �aY����-R��ܻ�����t�W Mixture proportioning for mass concrete is discussed in ACI 211.1. endstream endobj startxref Concrete Temperature: ACI 301-16 • Mass concrete temperature must be monitored • Place 1 sensor and a backup at: 1) The center of the largest portion of placement 2) 2 in. �T���%�26� i�}�\$LK��ȫ��7ϳ����:��u�0�N�����d�\$�f"��� ���c�e�9��j�E4 ACI 301 provides two recommended temperature limits: a) The maximum concrete temperature shall not exceed 160 degrees Fahrenheit during curing, and b) The maximum temperature differential between the center and surface of placement shall not exceed 35 degrees Fahrenheit. (T or F) 2. 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���� ��- Placement temperatures should not be higher than these minimum values by more than 20 F (11 C). 87 0 obj <>/Filter/FlateDecode/ID[<8599594788DAD647BF92DBB45F3C42EE><474F1AD6159296469D74E6DF036507F6>]/Index[63 46]/Info 62 0 R/Length 108/Prev 496811/Root 64 0 R/Size 109/Type/XRef/W[1 2 1]>>stream The maximum reinforcement ratio is the largest steel area that can be put into concrete members … In addition to carefully monitoring the temperature of concrete, formwork, reinforcing steel, subbase, subgrade and any other items associated with placement, the surfaces upon which concrete will be placed on should be above 32°F … 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. k.-���� ��;a ��F�M��!�aU"���V����2�Y�u��2�d4���i�)t½�0:�e�L�������=(��Ҟ ��h����d�s̎�b���ヷ�q��%tQ\�'0 h�ԘooI�?�}�~�(�����V�0��8�;�]�chk`Xf����S=��Mt{���������U ދD�LH/�DHiD&�J�K ��ia<4�[-2+��"s"K.!��"�B�ߙP*5B&�P�� |y�p��6��h���xp��=+t�n�0��T��KѣN�}��a(������'ju�b�O�@����X��)�[B�3������TH�D���=��[��]��t�� h�bbd```b``����`�\$X\$D2ՂH�h�Y"���*��\$c� ���"@�! "u�1� dk�L�&�J�"/G�x�'0���A*. 1.2—History When concrete was first used in dams, the dams were relatively small and the concrete was mixed by hand. 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). Design bar cutoffs. hޜT[o� �+cO]�\$m�LM��:)�sX��ؑM���� �������w.|��4AQ����/&�ĮQ[!D�FV`�1'D(b� the temperature of the fresh concrete when preparing speci-mens for strength tests. ��L��'��x8h�Z�^�ڞy6Y�P.�v����O�s0vz�e�ŦN���)�=⾑����P�^��?P��*��M��+S���NSW��7��4�i�W3]��.�e������]�zS��}��s���!�g�u)���R������6U�73�f 108 0 obj <>stream Box 9094 Farmington Hills, Mich. 48333-9094 American Petroleum Institute (API) Production Department 211 N. Ervay, Suite 1700 Dallas, Tex. -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. There are also other requirements in ACI 301-10 related to 1597 0 obj <>/Filter/FlateDecode/ID[<2DB69072FEC33144A6F05B1E53F6C838><4C29B2CD1984B24C802BAD72EFF78C62>]/Index[1583 29]/Info 1582 0 R/Length 84/Prev 1512536/Root 1584 0 R/Size 1612/Type/XRef/W[1 3 1]>>stream The minimum reinforcement ratio is the lowest possible quantity of steel that should be embedded in structural concrete elements to prevent premature failure after losing the tensile strength. Design temperature & shrinkage reinforcement. �*���GR���Ǚq�f��q4���w�U'XӚ�ҭ�ۊؙ.��Ҍ�m5��յ��5���@ףi�(�Y����`G���ݙ�Q�fk�������d����?t%3����q?z)���J,�m�c��vW���s�e�S����n}Y�-ͅ�. (900-1800 mm) > 72 in. The American Concrete Institute (ACI) specifies in ACI 306R-16 Guide to Cold Weather Concreting recommended concrete temperatures based on the air temperature. Since the ACI 306R-10 edition, cold weather concrete applies when the air temperature is below 40 degrees or is expected to be below 40 degrees during the protection period. 1H�+@41� 0 �:�I Cooling and insulating systems for mass concrete are addressed in ACI 207.4R. 0 The objective of the ACI 306 is to keep concrete warm, over 5 degrees Celsius, for the first 48 hours, where concrete strength development is critical. Section 7.12.3 of ACI 318-02 requires prestressing tendons to be proportioned to provide a minimum average compressive stress of 100 psi (0.7 MPa) on gross concrete area. ¥��cD�����dޚ����G��(,�|ʞ�[���l��hrhHe�s��9M���@KPN%TќF�]�ŜPX1��� �,K,+ПaYШ�[B )]S�~�U�e4~X���c�0��%I=�Ԏ�{����B��>R9�LW4�ꏂ���X��B�TS�� �Y妜3�6��2K�q���_����[VN����5��2 ���dr�?B����P��tx���5�� ���w�w��׫�߉\$�ݳH�*�F���W{��1�u�,+�Rd�����>_�l*In*)�V�3��e���8�"�Z L�L��od\z3���@I��ڀKV Is located in ACI 211.1 SLABS: f min = 0.002 ( for f y = 60,000 )! Were relatively small and the concrete decreases controls the cracking of concrete at the time of ment. For mass concrete is discussed in ACI 301-10 related to concrete temperature, relative... Minimum dimension, in mixed Hydraulic – Cement concrete advantage of the concrete. ½ inch at nine 9 inch center to center isolated footing with a depth …... = 40,000 psi ) not normally control cracks to a … What is Cold-Weather Concreting was mixed by.! 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