Study on the Effect of Water to Binder Ratio on the Properties of Low Water/Binder Cementitious Composite
In response to the unclear influence of water/binder ratio on the properties of low water/binder cementitious composites(LWBCC),four groups of LWBCC samples with water/binder ratios ranging from 0.16 to 0.22 were tested for their macroscopic performance and hydration products.The results show that as the water/binder ratio increases,the flowability of LWBCC samples increases from 71.5 mm to 150.3 mm,while the wet density decreases from 0.691 to 0.572 3,and the com-pressive strength decreases from 81.25 MPa to 68.64 MPa.X-ray diffraction and infrared spectrosco-py results show that the phases of LWBCC samples mainly include tricalcium silicate,dicalcium sili-cate,calcium hydroxide,and ettringite.The change in water/binder ratio has no significant effect on the phase composition of hydration products.The results of 29 Si solid-state nuclear magnetic reso-nance spectroscopy indicate that the increase in water/binder ratio leads to an increase in the degree of hydration.
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