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1005 MNC-A3型高效早強減水劑hardening accelerating and water reducing admixture

放大字體  縮小字體 發(fā)布日期:2009-01-09  來源:中國混凝土網(wǎng)  作者:中國混凝土網(wǎng)
核心提示:1005 MNC-A3型高效早強減水劑hardening accelerating and water reducing admixture
  本劑的早強、減水、增強作用顯著,屬自然養(yǎng)護型產(chǎn)品。摻本劑的混凝土適用于框架結(jié)構(gòu)及搶修搶建工程。長度為7.2m的摻本劑的混凝土大梁在常溫下(20±3℃)成型后3d即可拆除底模加放樓板。本劑適用于常溫、低溫和負溫(最低氣溫不低于-6℃)環(huán)境中施工的有早強或防凍要求的普通混凝土、鋼筋混凝土和預應力混凝土工程。常溫下施工,摻本劑的混凝土3d可以達到不摻外加劑的混凝土7d的強度,7d可以達到設計強度等級,28d可提高混凝土設計強度的10%~15%;50℃養(yǎng)護(5~7月份用黑塑料布覆蓋)2d可以達到設計強度等級的75%。本劑以摻量小、早強效果好、后期增強幅度大而聞名全國。執(zhí)行標準:GB 8076-1997。
一、 適用范圍
1、適用于現(xiàn)澆和預制的混凝土、預應力鋼筋混凝土及外摻粉煤灰混凝土,對普通硅酸鹽水泥、礦渣硅酸鹽水泥和火山灰硅酸鹽水泥等均有較好的適應性。本產(chǎn)品對混凝土冬季施工效果更為顯著。
2、 適用于自然養(yǎng)護的混凝土工程及制品。本品減水增強作用顯著,早期效果尤佳,可大大加快模板和場地周轉(zhuǎn),縮短工期。
二、 主要性能
1、本產(chǎn)品為灰色粉劑,無毒、無臭、不燃,對鋼筋無銹蝕作用。
2、該產(chǎn)品是一種復合早強減水劑,既可提高混凝土工程和制品的早期強度,又可節(jié)約水泥。
3、在0~20℃平均氣溫下,摻加2%的該產(chǎn)品,可使混凝土一天抗壓強度提高80%以上,三天抗壓強度提高60%以上,七天抗壓強度提高30%以上,二十八天抗壓強度提高15%以上。
4、對于一般塑料性混凝土摻加2%的該早強減水劑,可減少拌和用水20%以上。
5、摻入本產(chǎn)品以后,混凝土各種物理性能均有良好的改善。
6、在坍落度和強度基本相同的情況下,可節(jié)約水泥10%以上。
三、 摻MNC-A3型早強減水劑混凝土性能指標
檢驗項目
企標
檢測結(jié)果
檢測項目
企標
檢測結(jié)果
減水率(%)
≥12
13.2
抗壓強度比(%)
1d
≥180
185
泌水率比(%)
≤90
78
3d
≥160
164
含氣量(%)
≤3.0
2.7
7d
≥130
135
凝結(jié)時間差(min)
初凝
-90~+120
+28
28d
≥115
118
終凝
+37
收縮率比(%)
28d
≤135
128
對鋼筋銹蝕作用
注:檢測摻量2%(以水泥用量計)。
四、 推薦摻量
本產(chǎn)品的摻量范圍為2 %,推薦摻量為2%(以水泥用量計)。
五、 使用方法
1、本產(chǎn)品可與水泥一起加入攪拌機,計量必須準確。
2、為攪拌均勻,應延長攪拌時間30秒。
六、 包裝、運輸、貯存
1、本品采用內(nèi)襯塑料袋,外編織袋包裝。每袋凈重25㎏±0.13㎏或50㎏±0.25㎏。
2、運輸時謹防受潮和遇鋒利物,以防止破包。
3、應貯存在通風、干燥的專用倉庫內(nèi),有效期為二年,超過有效期經(jīng)檢測合格后仍可使用。若受潮結(jié)塊需烘干粉碎后使用。

MNC-A3 SERIES EARLY-STRENGTH SUPERPLATICISER

APPLICATION
1. Widely used in pre-cast & deposit concrete. armored concrete, pre-stressed reinforced concrete and fly-ash-cement concrete. Compatible with Portland cemen, normal Portland cement, Porland slag cement, fly-ash cement and Portland pozzolanic cement etc.
2. Suitable for selt-cured concrete and its formulations. It has remarkable effects of water reduction and enhancement, especially at the early stage. The modulus and site utilization can be improved.
PROPERTIES,FEATURES & CHARACTEISTICS
1. Appearance: Pale powder. Non-poisonous, odorless, non-flammable and non-corrosive to steel bars.
2. The combined early-strength powdery agent can improve early strength and save cement.
3. At 0~20℃ compression strength can be increased by 80% on the 1st day,60% on the 3rd day,30% on the 7th day and 15% on the 28th day when the agent is added at 2%.
4. 12% of water can be reduced when it is applied to normal superplastic concrete at 2%.
5. After application, all physical properties of concrete can be improved to a certain extent.
6. 10% of cement will be reserved when it is applied as a condition of blending in which collapsibility and strength are fixed aforehand.
PARAMETERS & ACCEPTANCE CRITERIA(FOR REFERENCE)

Parameters
Criteria
Actual Results
Parameters
Criteria
Actual Results
Water Reduction, %
≥12
13.2
Compression strength, %
1d
≥180
185
Water Penetration, %
≤90
78
3d
≥160
164
Air Content, %
≤3.0
2.7
7d
≥130
135
Temporal Distribution for setting (min)
Initial setting time
-90~+120
+28
28d
≥115
118
Terminal setting time
+37
Shrinkage, %
28d
≤135
128
Corrosion to steel bars
None
None
Note: Standard Blend Dosage:2%(as cement amount)
RECOMMENDED BLEND DOSAGE
The blend dosage normally ranges from 2 %.The standard blend dosage is established at 2%.
DIRECTIONS
1. The powdery agent can be agitated together with cement. Accurate measurement is essential.
2. A 30-second agitation is required to achieve good homogeneity.
PACKGING,TRANSPORTATION AND STORAGE
1. Woven fabric bag with plastic liner.Net weight:25kg 0.13 or 50kg 0.25.
2. Cautions should be taken to prevent from being torn by sharp-ended objects while packages are transferred or delivered.
3. It should be stored in a dedicated warehouse that is well-ventilated and dry. It remains effective for two years. At the expration, re-use is allowed if the testing results fall within the established range. In case of humidity contamination, re-use is allowed after drying and crushing.

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