Effect of Styrene–Butadiene Rubber Latex on Mechanical Properties of Cementitious Materials Highlighted by Means of Nanoindentation
Effect of Styrene–Butadiene Rubber Latex on Mechanical Properties of Cementitious Materials Highlighted by Means of Nanoindentation
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DOI：
10.1111/j.1475-1305.2008.00549.x
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发表时间：
2011-04
期刊：
影响因子：
2.1
通讯作者：
R. Wang;R. Lackner;P.M. Wang
中科院分区：
文献类型：
--
作者：
R. Wang;R. Lackner;P.M. Wang
摘要：在本文中，考虑到 SBR 乳胶/水泥比例从 0% 到 20% 变化，通过纳米压痕（NI）技术鉴定的丁苯橡胶（SBR）乳胶改性水泥浆体的微观力学性能与通过标准测试方法获得的 SBR 乳胶改性砂浆的宏观力学性能相关。为此，从 NI 获得的水泥浆不同材料相（即水合硅酸钙 (CSH)、硅酸钙石、无水水泥等）的硬度平均值和所谓的压痕模量，一方面与抗压强度和抗弯强度进行比较，另一方面与 SBR 乳胶改性砂浆的动态弹性模量进行比较。该比较揭示了动态弹性模量和压痕模量之间以及压缩强度、弯曲强度和硬度之间的线性相关性。因此，获得的结果清楚地表明了宏观弹性和强度性能的更精细尺度的起源，将所谓砂浆尺度的机械性能与水泥浆尺度联系起来。
Abstract: In this paper, micro‐mechanical properties of styrene–butadiene rubber (SBR) latex‐modified cement pastes identified by means of the nanoindentation (NI) technique are related to macro‐mechanical properties of SBR latex‐modified mortars obtained from standard test methods, considering an SBR latex/cement ratio varying from 0% to 20%. For this purpose, the average value of the hardness and the so‐called indentation modulus of the different material phases of the cement paste, i.e. calcium–silicate–hydrate (CSH), portlandite, anhydrous cement, etc., obtained from NI are compared with the compressive and flexural strengths, on the one hand, and the dynamic elastic modulus of SBR latex‐modified mortars, on the other hand. This comparison revealed a linear correlation between the dynamic elastic modulus and the indentation modulus and between the compressive strength, flexural strength and hardness. Thus, the obtained results clearly indicate the finer‐scale origin of the macroscopic elastic and strength properties, linking the mechanical properties at the so‐called mortar scale to the cement‐paste scale.