Add time:08/03/2019 Source:sciencedirect.com
Lithium salts are known to have remarkable effect to restrain alkali aggregate reaction, but the influence on strength and setting time of cement paste is uncertain. This paper presents an experimental approach to study the influence of Lithium sulfate (cas 10377-48-7) on strength and setting time of ordinary Portland cement paste with electrical resistivity measurement and other methods. It is shown that lithium sulfate has the function to accelerate cement hydration reaction, shorten setting time and enhance the strength whether at early age or long-term age as well. Meanwhile, the electrical resistivity development of different samples with various dosages of lithium sulfate reflects that lithium sulfate plays the role of set accelerator and hardening accelerator in ordinary Portland cement paste, and the larger content results in stronger effect. So moderate lithium sulfate is beneficial to adjust setting time and increase early strength as well as long-term strength.
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