CN1132186A - 水泥安定性快速测定专用促凝剂 - Google Patents

水泥安定性快速测定专用促凝剂 Download PDF

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CN1132186A
CN1132186A CN 95110995 CN95110995A CN1132186A CN 1132186 A CN1132186 A CN 1132186A CN 95110995 CN95110995 CN 95110995 CN 95110995 A CN95110995 A CN 95110995A CN 1132186 A CN1132186 A CN 1132186A
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cement
stability
special coagulant
quick
coagulant
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顾燕飞
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • C04B40/0042—Powdery mixtures
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/10—Accelerators; Activators

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

Abstract

一种水泥安定性快速测定专用促凝剂，由Na2NO3(无水碳酸钠)、Na2SO4(无水硫酸钠)和K2CO3(无水碳酸钾)混合组成。Na2CO3占总重量的60.0-65.0％，Na2SO4占总重的30.0-32.0％，其余为K2CO3。上述三种原料均为分析纯级试剂。把三种原料按比例称好，放在混合器内充分混合后，按GB3350.8和GB1346中的6.5.1制成试件，放入一定温、湿度的养护箱内，再按GB1346凝结时间检验方法检验，其终凝时间为45分钟左右，具有无毒无腐蚀性，性能稳定，适用于多标号硅酸盐类水泥的特点。

Description

水泥安定性快速测定专用促凝剂
本发明是涉及一种用于在短时间内测定硅酸盐水泥、普通硅酸盐水泥和矿渣硅酸盐水泥安定性指标的专用促凝剂。
据有关资料检索，目前还没有与本发明的成份相同的水泥安定性快速测定专用促凝剂。目前在水泥领域所用的促凝剂都是用于水泥胶砂和混凝土工程中，水泥净浆中用的促凝剂国内未见报导和公开使用，在国外则用NaOH(氢氧化钠)先溶于水后再加入水泥净浆中作为促凝剂，这种用NaOH来作为水泥净浆促凝剂的不足之处，一是由于NaOH是强碱，因此容易灼伤使用者的皮肤或衣服，二是经实践使用其促凝效果不够理想，如果用该促凝剂来测定水泥的安定性指标，则其测定时间仍较长。
本发明的目的是克服据国外报导的用NaOH作水泥净浆促凝剂的不足之处，提供一种无腐蚀性的，对水泥净浆促凝效果好、时间短的水泥安定性快速测定专用促凝剂。
本发明的目的是通过以下方案来实现。水泥安定性快速测定专用促凝剂由Na2CO3(无水碳酸钠)、Na2SO4(无水硫酸钠)和K2CO3(无水碳酸钾)混合组成。Na2CO3占总重量的60.0--65.0％，Na2SO4占总重量的30.0--31.0％，其余为K2CO3。Na2CO3、Na2SO4和K2CO3在混合之前都是粉状的。Na2CO3、Na2SO4和K2CO3在混合之前都是分析纯级试剂。按上述技术方案制成后将其密封保存于阴凉、干燥处。
本发明与国外报导的用NaOH作水泥净浆促凝剂相比具有无毒无腐蚀性、性能稳定、原材料价廉易得。本促凝剂可用于多标号的硅酸盐水泥、普通硅酸盐水泥和矿渣硅酸盐水泥，它不会改变水泥中游离氧化钙、氧化镁等物质的含量。在500g水泥中加入含6g本促凝剂的用水量搅拌成浆，成型后再放入温度控制在45±2℃，湿度大于90％的湿气养护箱内，可在1.5小时内使水泥净浆凝固，并产生强度，取出后经短期(1小时)沸煮，即可测得其安定性膨胀值。本促凝剂的加入，试件成型时，和易性良好，并促进强度的正常发展。本促凝剂各组成成分之间无化学反应，无物理变化，且本促凝剂的加入也不会引起试件膨胀或收缩。
在实践中我们对本促凝剂的配方进行多次试验，并取得了较好结果。其配方组成如下：配方一为：Na2CO3占总重量的60.5％，Na2SO4占总重量的31.5％，其余为K2CO3；所组成的配方的三种材料均为市场销售的粉状分析纯级试剂，将这三种材料按比例称量后，三者倒在一起，然后将其放在静态混合器或者动态混合器中将其充分混合成混合物，该混合物即为本促凝剂，然后用符合GB3350.8的水泥净浆搅拌机搅拌，将称好的500g水泥试样倒入搅拌锅内，量取按GB1346标准中第6条规定方法测得的标准稠度用水量，并在该水中溶入本促凝剂6g，拌和时先将锅放在搅拌机锅座上，升到搅拌位置，开动机器，同时徐徐加入已溶有本促凝剂的拌和水，慢速搅拌60秒，接着快速搅拌60秒后停机，然后按GB1346标准中6.5.1的方法制成雷氏夹试件，然后把该试件放在温度控制在45±2℃，湿度大于90％的湿气养护箱内养护，经GB1346-89规范中凝结时间检验方法检验后，终凝时间为41分钟。
配方二为：Na2CO3占总重量的63.0％，Na2SO4占总重量的31.0％，其余为K2CO3，所组成配方的三种材料也均为市场上销售的分析纯级粉状试剂。其余混和方法和试验方法均同配方一，测定终凝时间为45分钟。
配方三为：Na2CO3占总重量的64.5％，Na2SO4占总重量的30.5％，其余为K2CO3，所组成配方的三种材料也均为市场上销售的分析纯级粉状试剂，其余混和方法和试验方法均同配方一，测得终凝时间为46分钟。
以上三个配方分别对硅酸盐水泥、普通硅酸盐水泥和矿渣硅酸盐水泥进行试验，其结果是终凝时间均在45分钟左右，从试验结果看出本发明为水泥安定性快速测定提供了理想的专用促凝剂，而水泥安定性的快速测定能使水泥生产厂及时发现问题，及时控制生产，使产品合格率大大提高，避免废品水泥积压，从而提高产量；能使水泥使用单位在购货时及时发现废品水泥，有选择地购进合格水泥，能使施工单位及时发现问题，避免生产废品砼等等。因此本发明将会产生良好的经济效益和社会效益。

Claims (4)

1.一种水泥安定性快速测定专用促凝剂，其特征是由Na2CO3(无水碳酸钠)、Na2SO4(无水硫酸钠)和K2CO3(无水碳酸钾)混合组成。
2.按权利要求1所述的水泥安定性快速测定专用促凝剂，其特征是Na2CO3占重量的60.0--65.0％，Na2SO4占总重量的30.0--32.0％，其余为K2CO3。
3.按权利要求1所述的水泥安定性快速测定专用促凝剂，其特征是Na2CO3、Na2SO4和K2CO3在混合之前都是粉状的。
4.按权利要求1或3所述的水泥安定性快速测定专用促凝剂，其特征是Na2CO3、Na2SO4和K2CO3在混合前都是分析纯级试剂。
CN 95110995 1995-03-31 1995-03-31 水泥安定性快速测定专用促凝剂 Pending CN1132186A (zh)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7666334B2 (en) 2001-10-31 2010-02-23 Specialty Minerals (Michigan) Inc. Method, composition and apparatus for controlled concrete
CN101451061B (zh) * 2008-12-30 2011-03-16 山东大学 一种油泥砂固砂堵水调剖剂

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7666334B2 (en) 2001-10-31 2010-02-23 Specialty Minerals (Michigan) Inc. Method, composition and apparatus for controlled concrete
CN101451061B (zh) * 2008-12-30 2011-03-16 山东大学 一种油泥砂固砂堵水调剖剂

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