PMID- 34640148
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20211016
IS  - 1996-1944 (Print)
IS  - 1996-1944 (Electronic)
IS  - 1996-1944 (Linking)
VI  - 14
IP  - 19
DP  - 2021 Oct 1
TI  - Effect of Sulphur-Containing Tailings Content and Curing Temperature on the 
      Properties of M32.5 Cement Mortar.
LID - 10.3390/ma14195751 [doi]
LID - 5751
AB  - The effect of the dosage of sulphur-containing tailings (STs) and curing 
      temperature on the properties of M32.5 cement mortar was studied in this work. An 
      experimental study was conducted to evaluate the effects of STs with different 
      substitution ratios (0, 10%, 20%, 30%, 40%) on the compressive strength 
      experiment, fluidity, expansion ratio, and pore structure of M32.5 cement mortar. 
      The results showed that the addition of STs reduced the fluidity of mortar, and 
      the fluidity decreased with the increase of the STs dosage. The compressive 
      strength of mortars increased at a lower substitution rate (0~20%) but decreased 
      at a higher substitution rate (>20%). Ettringite peaks and new sulfate peaks were 
      found by X-ray diffraction (XRD) analysis. Scanning electron microscope (SEM) 
      observation of the microstructure showed that a large number of hydrated 
      products, such as ettringite, formed and filled in the interstitial space, which 
      was conducive to the development of strength. The optimal STs replacement ratio 
      of river sand was 10%. Then, the performance of mortar at curing temperatures of 
      23 +/- 1, 40, 60, and 80  degrees C was further investigated under the optimal STs 
      replacement ratio. Under high-temperature curing conditions, the early strength 
      of M32.5 cement mortar with STs increased greatly, but the late strength 
      decreased gradually with the increase in curing temperature. The early strength 
      development of the mortar mainly depended on the high speed of hydration 
      reaction, and the late strength variation was mainly affected by hydration 
      products and the pore size distribution. After comprehensive consideration, the 
      optimal curing temperature of M32.5 cement mortar with STs was 40  degrees C.
FAU - Chen, Qian
AU  - Chen Q
AD  - School of Civil Engineering and Architecture, Anhui University of Science and 
      Technology, Huainan 232001, China.
FAU - Chen, Haiming
AU  - Chen H
AD  - School of Civil Engineering and Architecture, Anhui University of Science and 
      Technology, Huainan 232001, China.
AD  - Engineering Research Center of Underground Mine Construction, Ministry of 
      Education, Anhui University of Science and Technology, Huainan 232001, China.
FAU - Wang, Pengju
AU  - Wang P
AD  - School of Civil Engineering and Architecture, Anhui University of Science and 
      Technology, Huainan 232001, China.
FAU - Chen, Xiang
AU  - Chen X
AD  - School of Civil Engineering and Architecture, Anhui University of Science and 
      Technology, Huainan 232001, China.
FAU - Chen, Jie
AU  - Chen J
AD  - School of Civil Engineering and Architecture, Anhui University of Science and 
      Technology, Huainan 232001, China.
LA  - eng
GR  - 41440018/National Natural Science Foundation of China/
GR  - 41672278/National Natural Science Foundation of China/
GR  - 41977236/National Natural Science Foundation of China/
GR  - 51728201/National Science Foundation of China Overseas and Hong Kong-Macao 
      Scholar Cooperative Research Foundation/
GR  - 2020CX2029/Graduate Innovation Fund of Anhui University of Science and 
      Technology/
PT  - Journal Article
DEP - 20211001
PL  - Switzerland
TA  - Materials (Basel)
JT  - Materials (Basel, Switzerland)
JID - 101555929
PMC - PMC8510235
OTO - NOTNLM
OT  - curing temperature
OT  - microstructure
OT  - pore size distribution
OT  - sulfate
OT  - sulphur-containing tailings
COIS- The authors declare that there is no conflict of interest regarding the 
      publication of this paper.
EDAT- 2021/10/14 06:00
MHDA- 2021/10/14 06:01
PMCR- 2021/10/01
CRDT- 2021/10/13 01:09
PHST- 2021/08/18 00:00 [received]
PHST- 2021/09/21 00:00 [revised]
PHST- 2021/09/28 00:00 [accepted]
PHST- 2021/10/13 01:09 [entrez]
PHST- 2021/10/14 06:00 [pubmed]
PHST- 2021/10/14 06:01 [medline]
PHST- 2021/10/01 00:00 [pmc-release]
AID - ma14195751 [pii]
AID - materials-14-05751 [pii]
AID - 10.3390/ma14195751 [doi]
PST - epublish
SO  - Materials (Basel). 2021 Oct 1;14(19):5751. doi: 10.3390/ma14195751.