INFLUENCE OF ADMIXTURES ON STRENGTH AND HYDRATION PERFORMANCE OF STEEL SLAG & DESULFURIZATION ASH BASED CEMENTITIOUS MATERIALS

SHAO Yan; JIANG Mingming; XIONG Jingchao; GUO Huajun; CHEN Kun; LIU Zihao; XU Xiaoming; HU Guofeng

doi:10.13205/j.hjgc.202212018

Volume 40 Issue 12

Nov. 2022

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Article Navigation > ENVIRONMENTAL ENGINEERING > 2022 > 40(12): 134-141

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SHAO Yan, JIANG Mingming, XIONG Jingchao, GUO Huajun, CHEN Kun, LIU Zihao, XU Xiaoming, HU Guofeng. INFLUENCE OF ADMIXTURES ON STRENGTH AND HYDRATION PERFORMANCE OF STEEL SLAG & DESULFURIZATION ASH BASED CEMENTITIOUS MATERIALS[J]. ENVIRONMENTAL ENGINEERING , 2022, 40(12): 134-141. doi: 10.13205/j.hjgc.202212018

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INFLUENCE OF ADMIXTURES ON STRENGTH AND HYDRATION PERFORMANCE OF STEEL SLAG & DESULFURIZATION ASH BASED CEMENTITIOUS MATERIALS

doi: 10.13205/j.hjgc.202212018

WISDRI City Environment Protection Engineering Co., Ltd, Wuhan 430205, China

Received Date: 2021-07-29
Available Online: 2023-03-23

Abstract

Abstract

Aiming at the problem of low early strength of steel slag-desulfurized ash-based cementitious materials, the effects of different early strength agents on the compressive strength and hydration performance of steel slag-desulfurized ash-based cementitious materials were studied. Experimental research results showed that when the desulfurization ash content was 15%, the 3-day compressive strength was 3.65 MPa, which was 48.95% lower than the blank sample. Using quicklime, calcium chloride, calcium formate, silica fume, aluminum sulfate and other composite early-strength agents to modify steel slag-desulfurization ash-based cementitious materials, the 3-day compressive strength reached 17.89 MPa, which was 4.90 times that of the blank sample, and met the cement compressive strength requirements of composite Portland cement 42.5 grade, specified in China’s national standard, GB 175—2007. Through XRD, SEM, FI-RT, XPS and DTG tests, it was found that the main hydration products of cementitious materials were monosulfur hydrated calcium aluminum sulfide, hydrated calcium chloroaluminate, and hydrated calcium silicate, and Friedel’s salt.
- desulfurization ash,
- steel slag,
- early strength agent,
- compressive strength,
- hydration characteristics

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References

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