After class discussion Accompanied by the applause of netizens, about 3 hours of teaching content brushed and passed, but our netizen's enthusiasm has not subsided, after-school discussions are in full swing. Our lecturers, bargaining teachers, and staff members all responded to the netizens with earnestness and enthusiasm, adding a different kind of enthusiasm to the summer heat. Netizens raised their hands very positively. It seems that during the renovation process, various problems are still numerous. Was the top man by this old gentleman! The old gentleman seems to have a lot of experience. The teacher also stood up and actively discussed with everyone. When the old Aunty question was still very scholarly. The classmates began to copy the course clips. Our event was almost finished. We would like to welcome everyone to participate in our renovated university activities next time. Entrance decoration restaurant decoration home decoration Auxiliary Agent For Concrete Retarder Auxiliary Agent For Concrete Retarder,retarding agent,set Retarder Shanghai Hongyun New Construction Materials Co., Ltd , https://www.hongyunpce.com
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Links: 7.24 Qijia Decoration University Phase II & Decoration University Unveiling Opening Ceremony - Preparation
7.24 Unveiling the Opening Ceremony of Qijia Decoration University Phase II and Renovation University - Unveiling
7.24 Unveiling the Opening Ceremony of the Second Stage of the Qijia Decoration University - The Reading Book
7.24 Qijia Decoration University Phase II & Opening Ceremony of Unveiling University - After Class...
Classification by structure:
(1) Sugar: sugar calcium, gluconate, etc
(2) Citric acid, tartaric acid and their salts
(3) Zinc salt and phosphate
(4) lignosulfonate
Hardening effect
(1) Influence on strength, excessive incorporation will cause the concrete to remain unsolidified for 24 hours or even 72 hours, thus affecting the need for early strength of concrete and delaying the construction progress. No obvious effect was found on the concrete of suitable age.
(2) The effect on contraction, the appropriate use of the contraction has no significant effect. Excessive use will cause the top concrete to dry and shrink due to excessive water evaporation and shrinkage cracks.
(3) The effect on frost resistance durability is similar to that of concrete without adding retarder. [1]
Detection index
Increased turnover: 8
Initial setting time difference: +60~+120
Compressive strength ratio 7 days: 120
Compressive strength ratio 28 days: 120
Softening coefficient: 0.55