effect of water cement ratio on compressive strength of concrete
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endobj with age but decrease as the water-cement ratio increases. endobj An intelligent concrete vacuum water saturation instrument (SW-6, Beijing Shengshi Weiye Science & Technology Co., Ltd.) was used in the test. endobj The open pores were filled with water, and the absorbed water volume corresponds to the volume of the open pores.
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<> endobj <> �o- The physical properties and chemical composition of the cement are shown in Tables Relative viscosity was tested using a rotary viscometer (NXS-11A, Chengdu Instrument Factory, China). 35 0 obj x�]�Mj�0��>�����$t��,�C�������Fq�}e7L���>�,}�=����0���1�ac�0��I�8o�ѕ�.&*-� ��������k�N.�x��+;dO3�>/����7.H *�u�p�A�&��A��;�}����9>��Д�� c��5�lhF�VR�OR�Br��'�e8�q7U}_��{���n���,y�J����C�T>? The proportion of small pores reduces, the average pore diameter increases, and the pores become increasingly round.Given the same foam concrete w/c ratio, lower dry density would widen the pore diameter distribution range and increase the proportions of small and large pores.Water-cement ratio influences the size, shape, distribution, and connectivity of pores in foam concrete. <> endstream 10 0 obj
<> The compressive strength of the foam concrete showed an inverted V-shaped variation law with the increase in water-cement ratio. 32 0 obj <> 28 0 obj Researchers have therefore develop various models for predicting the effect of sand fines and W/C on the strength of concrete. <>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]>>/Parent 22 0 R/Annots[]/MediaBox[0 0 595.32 841.92]/Contents[118 0 R]/Type/Page>>
33 0 obj Any author submitting a COVID-19 paper should notify us at Effect of w/c on the rheological properties of cement paste.Characteristics of air pores of the test specimens.Effects of w/c ratio on the pore diameter distribution.Effect of the w/c ratio on the porosity of the foam concrete.The fitting relationships between the strength and dry density of foam concrete.Effect of w/c ratio on the strength of foam concrete.Department of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048, ChinaSichuan College of Architectural Technology, Deyang 618000, ChinaGiven the same density of foam concrete, a higher w/c ratio would result in a lower relative viscosity and a weaker bubble-maintaining capacity in cement paste.
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At a minimum, concrete specifications will usually call out the compressive strength and water/cement ratio (Figure B), as well as the slump (Figure E).Concrete mixes can vary in the type and quantity of cement, the ratio of water to cement, the percentage of entrained air, and the size and grading of aggregates. The cement paste volume had a significant effect on the properties of high performance concretes under tests and, accordingly, it would be advisable to take this factor into account in the design of concrete mixtures. 9 0 obj
Water affect the whole properties, the durability, strength of concrete to a great extent.
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endstream The microstructures of the specimens were determined by scanning electron microscopy (SEM; Hitachi JSM-7500F). <> �o- The experiment was carried out to investigate the effect of cement-water ratios on the compressive strength and density of concrete. 15 0 obj endobj [47 0 R]
40 0 obj endobj <> endobj In this experiment, the rheological properties of the cement pastes of different w/c ratios (0.40, 0.45, 0.50, 0.55, and 0.60) were evaluated and used to interpret the effect of the bubble maintenance of the cement pastes on the pore structure of hardened foam concrete. <> endobj 22 0 obj However, water-cement ratio above 0.65 was observed to have a very significant reduction effect on the compressive strength of the lateritic concrete mixes. �x�텄����Kd� ����\9c\C�.��@�0�>�a^cp��:���[�j�>��ۦn2�9�8c�ɸq)�g��8kB�ޟ�������U��6��8&��'M�d6����a��#~[wze`����.�����^����ۺ_+���j8�-r�PT��`�4��z�+��`�T�Qݧʄ�P��l=L�aDE���TZ&�0��W.���R+��f5���W�L���t�s�g��F�`�� �_�>X,�f�a�_�:V��Uy =��t؇�w]8� H������p8���p8���.h�T��"���s���*�.���p8���pd0"�b�P��YT���/ 4��N��R;� �@� � T=�)=j� 5�7��W0A(j8�'L�f�_���`A�R4"Qc <> endobj
endobj Compressive strength is at peak, when water to cement ratio is low.
content also has adverse effect of the strength of concrete due to poor adhesion. 17 0 obj endobj <>/Font<>/ExtGState<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]>>/Parent 22 0 R/Annots[]/MediaBox[0 0 595.32 841.92]/Contents[130 0 R]/Type/Page>> 36 0 obj 46 0 obj endobj <>
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