CN105399358A - 混凝土减水及保塌剂 - Google Patents

混凝土减水及保塌剂 Download PDF

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CN105399358A
CN105399358A CN201510798698.0A CN201510798698A CN105399358A CN 105399358 A CN105399358 A CN 105399358A CN 201510798698 A CN201510798698 A CN 201510798698A CN 105399358 A CN105399358 A CN 105399358A
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parts
concrete
water reducing
slump
rate
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CN105399358B (zh
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赵月
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Kang Yaowei
Lian Yuchao
Luo Lizhi
Lv Zhiwei
Sun Kai
Wang Bianran
Wang Dingding
Yang Ming
Zhao Haikui
Zhao Xueping
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039Premixtures of ingredients
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/30Water reducers, plasticisers, air-entrainers, flow improvers
    • C04B2103/302Water reducers
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/30Water reducers, plasticisers, air-entrainers, flow improvers
    • C04B2103/308Slump-loss preventing agents

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  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

本发明公开了一种混凝土减水及保塌剂,属于建筑土木领域,由下述重量份的组分组成:2-羟基丁二酸28.5-35.6份、聚乙二醇20015.2-18.7份、硬脂酸单甘油酯5.6-7.5份、乙撑双硬脂酰胺10.1-12.8份、十二烷基磺酸钠7.3-9.6份、膨润土1.5-2.1份,本申请的外加剂可以使减水率达到40%以上,最高可以达到46.5%;同时,该外加剂对于塌落度的保持很好,在2小时内,其坍落度的变化量小于5mm,另外,泌水率比可以达到50%以下,抗压强度比也有很大改进。

Description

混凝土减水及保塌剂
本申请为中国专利申请号2014102576858;发明名称:一种混凝土外加剂及其应用;申请日:2014.06.12的分案申请
技术领域
本发明涉及建筑土木领域,尤其涉及一种混凝土减水及保塌剂。
背景技术
混凝土外加剂是在拌制混凝土的过程中掺入,用以改善混凝土性能的物质,根据相关技术标准的规定,其掺入量不大于水泥质量的5%。混凝土外加剂的主要作用是改善新拌混凝土的性能和提高硬化混凝土的性能。混凝土外加剂中,主要包括用于改善混凝土拌合物流变性能的减水剂、引气剂,用于调节混凝土凝结时间、硬化性能的缓凝剂、早强剂,用于改善混凝土耐久性的防水剂等。
其中,减水剂是使用最为广泛的混凝土外加剂之一,根据其性能,减水剂包括普通减水剂、高效减水剂、高性能减水剂等等。在拌合混凝土时加入适量减水剂,可使水泥颗粒分散均匀,同时将水泥颗粒包裹的水分释放出来,从而能在保持物料流动性不变的情况下明显减少混凝土的用水量。
目前,聚羧酸系高性能减水剂是继木钙为代表的普通减水剂和以萘系为代表的高效减水剂之后发展起来的第三代高性能减水剂。其掺量仅在0.5-2.0之间,其减水率可达45%,但是,现有的聚羧酸系高性能减水剂最为突出的缺点是混凝土坍落度损失严重,最主要的原因可能是这种减水剂的加入加速了水泥的初期水化过程,而吸附作用又使液相中减水剂的有效浓度快速降低,体系的动电电位不断下降。开发一种既有较高减水率,同时具有较好保持坍落度的减水剂,是本行业一直在不断努力的方向。
发明内容
本发明的发明目的之一,在于针对上述存在的问题,提供一种既有较高减水率,同时能较好保持坍落度的混凝土外加剂。
本发明采用的技术方案是这样的:一种混凝土外加剂,由下述重量份的组分组成:
2-羟基丁二酸28.5-35.6份
聚乙二醇20015.2-18.7份
硬脂酸单甘油酯5.6-7.5份
乙撑双硬脂酰胺10.1-12.8份
十二烷基磺酸钠7.3-9.6份
膨润土1.5-2.1份。
本申请的发明人通过大量实验,得到上述组分和比例的外加剂,这种外加剂是一种完全不同于以往的普通减水剂、萘系高效减水剂和聚羧酸系高性能减水剂的新型减水剂,经过试验表明,该外加剂可以使减水率达到40%以上,最高可以达到46.5%;同时,该外加剂对于塌落度的保持很好,在2小时内,其坍落度的变化量小于5mm,另外,泌水率比可以达到50%以下,抗压强度比也有很大改进。
作为优选的技术方案,由下述重量份的组分组成:
2-羟基丁二酸30.6份
聚乙二醇20016.2份
硬脂酸单甘油酯6.3份
乙撑双硬脂酰胺11.8份
十二烷基磺酸钠8.5份
膨润土1.6份。
采用上述的比例,用于混凝土时效果可以达到最佳。
作为优选的技术方案,所述膨润土为钠基膨润土。
本发明的目的之二,在于提供上述混凝土外加剂的应用,采用的技术方案为:使用时,加入所述混凝土外加剂的量,按质量比计,为水泥质量的0.5%-0.8%。
作为优选的技术方案,在混凝土拌合前,先加入所述混凝土外加剂质量16%的水,将所述混凝土外加剂拌合均匀,并静置5-8min后,再加入到混凝土原料中进行拌合。
这样的拌合方式,可以使本申请的外加剂的性能更好。
综上所述,由于采用了上述技术方案,本发明的有益效果是:本申请的外加剂可以使减水率达到40%以上,最高可以达到46.5%;同时,该外加剂对于塌落度的保持很好,在2小时内,其坍落度的变化量小于5mm,另外,泌水率比可以达到50%以下,抗压强度比也有很大改进。
具体实施方式
下面对本发明作详细的说明。
为了使本发明的目的、技术方案及优点更加清楚明白,以下结合实施例,对本发明进行进一步详细说明。应当理解,此处所描述的具体实施例仅仅用以解释本发明,并不用于限定本发明。
实施例1:
一种混凝土外加剂,由下述重量份的组分组成:
2-羟基丁二酸28.5份
聚乙二醇20015.2份
硬脂酸单甘油酯7.5份
乙撑双硬脂酰胺10.1份
十二烷基磺酸钠9.6份
膨润土1.5份;
制备方法为:称量所述原料组分,然后加入所述混凝土外加剂质量16%的水,将所述混凝土外加剂拌合均匀,并静置5-8min后,即得;
所制得的外加剂,按水泥质量0.6%的比例加入,水泥采用混凝土检验基准水泥,砂细度模数2.6,石子采用二级配的碎石,然后参照GB8076-2008的相关标准进行检验,结果如下:
减水率达到40.1%,在2小时内,其坍落度的变化量为4.92mm,泌水率比为47%,1d抗压强度比为175%,3d抗压强度比为161%,7d抗压强度比为149%,28d抗压强度比为148%。
实施例2:
一种混凝土外加剂,由下述重量份的组分组成:
2-羟基丁二酸35.6份
聚乙二醇20015.2份
硬脂酸单甘油酯5.6份
乙撑双硬脂酰胺12.8份
十二烷基磺酸钠7.3份
膨润土2.1份;
制备方法与实施例1相同;
所制得的外加剂,按水泥质量0.6%的比例加入,水泥采用混凝土检验基准水泥,砂细度模数2.6,石子采用二级配的碎石,然后参照GB8076-2008的相关标准进行检验,结果如下:
减水率达到40.5%,在2小时内,其坍落度的变化量为4.95mm,泌水率比为49%,1d抗压强度比为179%,3d抗压强度比为165%,7d抗压强度比为151%,28d抗压强度比为150%。
实施例3
一种混凝土外加剂,由下述重量份的组分组成:
2-羟基丁二酸32.6份
聚乙二醇20018.7份
硬脂酸单甘油酯5.9份
乙撑双硬脂酰胺12.2份
十二烷基磺酸钠9.0份
膨润土1.9份;
制备方法与实施例1相同;
所制得的外加剂,按水泥质量0.6%的比例加入,水泥采用混凝土检验基准水泥,砂细度模数2.6,石子采用二级配的碎石,然后参照GB8076-2008的相关标准进行检验,结果如下:
减水率达到43.6%,在2小时内,其坍落度的变化量为4.12mm,泌水率比为43%,1d抗压强度比为183%,3d抗压强度比为170%,7d抗压强度比为152%,28d抗压强度比为151%。
实施例4
一种混凝土外加剂,由下述重量份的组分组成:
2-羟基丁二酸30.6份
聚乙二醇20016.2份
硬脂酸单甘油酯6.3份
乙撑双硬脂酰胺11.8份
十二烷基磺酸钠8.5份
膨润土1.6份;
制备方法与实施例1相同;
所制得的外加剂,按水泥质量0.6%的比例加入,水泥采用混凝土检验基准水泥,砂细度模数2.6,石子采用二级配的碎石,然后参照GB8076-2008的相关标准进行检验,结果如下:
减水率达到46.5%,在2小时内,其坍落度的变化量为3.80mm,泌水率比为38%,1d抗压强度比为187%,3d抗压强度比为171%,7d抗压强度比为156%,28d抗压强度比为155%。

Claims (3)

1.一种混凝土减水及保塌剂,其特征在于,由下述重量份的组分组成:
2-羟基丁二酸28.5-35.6份
聚乙二醇20015.2-18.7份
硬脂酸单甘油酯5.6-7.5份
乙撑双硬脂酰胺10.1-12.8份
十二烷基磺酸钠7.3-9.6份
膨润土1.5-2.1份。
2.一种混凝土减水及保塌剂,其特征在于,由下述重量份的组分组成:
2-羟基丁二酸30.6份
聚乙二醇20016.2份
硬脂酸单甘油酯6.3份
乙撑双硬脂酰胺11.8份
十二烷基磺酸钠8.5份
膨润土1.6份。
3.根据权利要求1所述的混凝土减水及保塌剂,其特征在于,所述膨润土为钠基膨润土。
CN201510798698.0A 2014-06-12 2014-06-12 混凝土减水及保塌剂 Expired - Fee Related CN105399358B (zh)

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CN107473619A (zh) * 2017-08-18 2017-12-15 杨小英 混凝土抗冻减水剂
CN107285656A (zh) * 2017-08-18 2017-10-24 杨小英 抗冻混凝土
CN107311510A (zh) * 2017-08-18 2017-11-03 杨小英 防冻抗冻混凝土
CN108002759A (zh) * 2017-12-18 2018-05-08 杨小英 抗渗混凝土
CN107963826A (zh) * 2017-12-18 2018-04-27 杨小英 具备抗渗功能的混凝土外加剂

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